--- title: "CNC Milling Services | Olympus Machining" description: "CNC milling for aluminum, stainless, titanium, and plastics. Tolerances to ±0.0005″. Prototype to production in Hanover, PA." lang: en json-ld: | [ { "@context": "https://schema.org", "@graph": [ { "@type": "Organization", "@id": "https://www.olympusmachining.com/#organization", "name": "Olympus Machining LLC", "url": "https://www.olympusmachining.com", "logo": "https://storage.googleapis.com/gpt-engineer-file-uploads/SFKHg3gA6NVscESUCStAZeugW5B3/social-images/social-1762640845290-Olympus-Machining-Gear-Logo_Logo-ONLY.png", "description": "Olympus Machining LLC is a precision CNC machining shop located in Hanover, Pennsylvania, providing CNC milling and CNC turning services for OEMs and manufacturers nationwide.", "telephone": "+17176345094", "email": "info@olympusmachining.com", "address": { "@type": "PostalAddress", "streetAddress": "639 Frederick St, Suite 1", "addressLocality": "Hanover", "addressRegion": "PA", "postalCode": "17331", "addressCountry": "US" }, "sameAs": [ "https://www.google.com/maps/place/Olympus+Machining+LLC" ], "hasCredential": [ { "@type": "EducationalOccupationalCredential", "name": "ITAR Registration — DDTC", "credentialCategory": "Government Registration", "recognizedBy": { "@type": "Organization", "name": "U.S. Directorate of Defense Trade Controls (DDTC)" } }, { "@type": "EducationalOccupationalCredential", "name": "CMMC Level 1 Compliance", "credentialCategory": "Compliance Certification" } ] }, { "@type": [ "LocalBusiness", "ManufacturingBusiness" ], "@id": "https://www.olympusmachining.com/#localbusiness", "name": "Olympus Machining LLC", "image": "https://storage.googleapis.com/gpt-engineer-file-uploads/SFKHg3gA6NVscESUCStAZeugW5B3/social-images/social-1762640845290-Olympus-Machining-Gear-Logo_Logo-ONLY.png", "description": "Olympus Machining LLC is a precision CNC machining shop located in Hanover, Pennsylvania. We provide CNC milling, CNC turning, and prototype-to-production machining services for OEMs and manufacturers nationwide.", "address": { "@type": "PostalAddress", "streetAddress": "639 Frederick St, Suite 1", "addressLocality": "Hanover", "addressRegion": "PA", "postalCode": "17331", "addressCountry": "US" }, "telephone": "+17176345094", "email": "info@olympusmachining.com", "url": "https://www.olympusmachining.com", "priceRange": "$$", "areaServed": "United States", "aggregateRating": { "@type": "AggregateRating", "ratingValue": "5.0", "reviewCount": "15", "bestRating": "5", "worstRating": "1" }, "review": [ { "@type": "Review", "author": { "@type": "Person", "name": "Michael R." }, "reviewRating": { "@type": "Rating", "ratingValue": "5", "bestRating": "5" }, "reviewBody": "Olympus Machining delivered precise aluminum components for our robotics end-of-arm tooling on time and at a fair price." }, { "@type": "Review", "author": { "@type": "Person", "name": "Sarah T." }, "reviewRating": { "@type": "Rating", "ratingValue": "5", "bestRating": "5" }, "reviewBody": "We needed ITAR-compliant machining for defense hardware and Olympus Machining handled it professionally." }, { "@type": "Review", "author": { "@type": "Person", "name": "Dave K." }, "reviewRating": { "@type": "Rating", "ratingValue": "5", "bestRating": "5" }, "reviewBody": "Great CNC shop for prototype work. They provided DFM feedback that saved us time and cost." } ], "hasOfferCatalog": { "@type": "OfferCatalog", "name": "Olympus Machining CNC Services", "itemListElement": [ { "@type": "Offer", "itemOffered": { "@type": "Service", "@id": "https://www.olympusmachining.com/cnc-milling#service", "name": "CNC Milling Services", "url": "https://www.olympusmachining.com/cnc-milling", "provider": { "@id": "https://www.olympusmachining.com/#organization" } } }, { "@type": "Offer", "itemOffered": { "@type": "Service", "@id": "https://www.olympusmachining.com/cnc-turning#service", "name": "CNC Turning Services", "url": "https://www.olympusmachining.com/cnc-turning", "provider": { "@id": "https://www.olympusmachining.com/#organization" } } }, { "@type": "Offer", "itemOffered": { "@type": "Service", "@id": "https://www.olympusmachining.com/prototype-to-production#service", "name": "Prototype to Production Machining", "url": "https://www.olympusmachining.com/prototype-to-production", "provider": { "@id": "https://www.olympusmachining.com/#organization" } } }, { "@type": "Offer", "itemOffered": { "@type": "Service", "name": "ITAR Registered CNC Machining", "provider": { "@id": "https://www.olympusmachining.com/#organization" } } } ] } } ] }, { "@context": "https://schema.org", "@graph": [ { "@type": [ "LocalBusiness", "ManufacturingBusiness" ], "@id": "https://www.olympusmachining.com/#organization", "name": "Olympus Machining LLC", "alternateName": "Olympus Machining", "url": "https://www.olympusmachining.com", "logo": { "@type": "ImageObject", "url": "https://www.olympusmachining.com/images/olympus-logo.png", "width": 300, "height": 100 }, "image": "https://www.olympusmachining.com/images/olympus-machining-headquarters-hanover-pa.jpg", "description": "Olympus Machining LLC is a U.S.-based precision CNC machining shop in Hanover, Pennsylvania, providing CNC milling, CNC turning, and prototype-to-production machining services for OEMs and manufacturers nationwide.", "telephone": "+1-717-634-5094", "email": "info@olympusmachining.com", "address": { "@type": "PostalAddress", "streetAddress": "639 Frederick St, Suite 1", "addressLocality": "Hanover", "addressRegion": "PA", "postalCode": "17331", "addressCountry": "US" }, "geo": { "@type": "GeoCoordinates", "latitude": 39.8007, "longitude": -76.9836 }, "areaServed": { "@type": "Country", "name": "United States" }, "priceRange": "$$", "sameAs": [ "https://www.google.com/search?sca_esv=2f4ed381b998a4d8&sxsrf=AE3TifODgJgBq4b1RAZEZnaHSJwX6ZOvSg:1767447357236&kgmid=/g/11kr8nzb2c&q=Olympus+Machining+LLC&shndl=30&shem=ptotplc,shrtsdl&source=sh/x/loc/uni/m1/1&kgs=100779a69d016c62&utm_source=ptotplc,shrtsdl,sh/x/loc/uni/m1/1", "https://www.instagram.com/olympusmachining/" ], "knowsAbout": [ "CNC Milling", "CNC Turning", "Precision CNC Machining", "Prototype Machining", "Short-Run Production", "Robotics Machining", "Quality Assurance", "First Article Inspection", "ITAR Compliance" ], "hasOfferCatalog": { "@type": "OfferCatalog", "name": "CNC Machining Services", "itemListElement": [ { "@type": "OfferCatalog", "name": "CNC Milling Services", "url": "https://www.olympusmachining.com/cnc-milling" }, { "@type": "OfferCatalog", "name": "CNC Turning Services", "url": "https://www.olympusmachining.com/cnc-turning" }, { "@type": "OfferCatalog", "name": "Precision CNC Machining", "url": "https://www.olympusmachining.com/precision-cnc-machining" }, { "@type": "OfferCatalog", "name": "Prototype to Production", "url": "https://www.olympusmachining.com/prototype-to-production" }, { "@type": "OfferCatalog", "name": "Robotics & Automation Machining", "url": "https://www.olympusmachining.com/robotics-automation-machining" } ] } }, { "@type": "WebSite", "@id": "https://www.olympusmachining.com/#website", "name": "Olympus Machining", "url": "https://www.olympusmachining.com", "publisher": { "@id": "https://www.olympusmachining.com/#organization" }, "potentialAction": { "@type": "SearchAction", "target": "https://www.olympusmachining.com/?s={search_term_string}", "query-input": "required name=search_term_string" } }, { "@type": "WebPage", "@id": "https://www.olympusmachining.com/cnc-milling#webpage", "name": "CNC Milling Services | Precision Machined Components | Olympus Machining", "description": "Precision CNC milling services for OEMs and manufacturers. Multi-axis milling, tight tolerances, prototype to production. Made in the USA — Hanover, Pennsylvania.", "url": "https://www.olympusmachining.com/cnc-milling", "isPartOf": { "@id": "https://www.olympusmachining.com/#website" }, "about": { "@id": "https://www.olympusmachining.com/#organization" }, "inLanguage": "en-US" }, { "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://www.olympusmachining.com" }, { "@type": "ListItem", "position": 2, "name": "CNC Milling", "item": "https://www.olympusmachining.com/cnc-milling" } ] }, { "@type": "Service", "@id": "https://www.olympusmachining.com/cnc-milling#service", "name": "CNC Milling Services", "description": "Precision CNC milling services including multi-axis milling for complex geometries, tight-tolerance machining, and prototype-to-production quantities. Materials include aluminum, steel, stainless steel, brass, copper, and plastics.", "url": "https://www.olympusmachining.com/cnc-milling", "provider": { "@id": "https://www.olympusmachining.com/#organization" }, "areaServed": { "@type": "Country", "name": "United States" }, "serviceType": [ "CNC Milling", "Multi-Axis Milling", "Precision Milling", "Prototype Milling" ] }, { "@type": "FAQPage", "@id": "https://www.olympusmachining.com/cnc-milling#faq", "mainEntity": [ { "@type": "Question", "name": "What is CNC milling?", "acceptedAnswer": { "@type": "Answer", "text": "CNC milling is a subtractive manufacturing process in which a computer-controlled multi-point rotary cutting tool removes material from a solid workpiece to produce parts with precise dimensions, complex geometries, and tight tolerances. The term CNC stands for Computer Numerical Control, referring to the automated control of machining tool movements via pre-programmed code (G-code). During CNC milling, the cutting tool rotates at high speed while traversing across multiple axes — typically X, Y, and Z — to cut pockets, slots, contours, holes, and 3D surface profiles. Modern CNC milling centers can operate on 3, 4, or 5 simultaneous axes, enabling the production of highly complex parts that would be impossible or impractical with manual machining. CNC milling is used across robotics, defense, medical, aerospace, and industrial manufacturing for both prototype and production quantities." } }, { "@type": "Question", "name": "What materials can be CNC milled?", "acceptedAnswer": { "@type": "Answer", "text": "CNC milling is compatible with a wide range of metals and engineering plastics. Common aluminum alloys include 6061-T6 (excellent machinability, general purpose structural use) and 7075-T6 (high-strength aerospace grade, harder to machine but superior strength-to-weight ratio). Steel grades include 1018 (low-carbon mild steel), 1045 (medium-carbon), 4140 (chromium-molybdenum alloy, excellent toughness), and 4340 (high-strength alloy for demanding applications). Stainless steel grades commonly milled include 303 (free-machining with sulfur addition), 304 (general corrosion resistance), 316 (molybdenum-enhanced for marine and chemical environments), and 17-4 PH (precipitation-hardened, high strength). Engineering plastics suitable for CNC milling include Delrin/acetal (POM), UHMW polyethylene, PEEK (polyether ether ketone, high-temp), and nylon. Brass and copper are also routinely milled for electrical and plumbing applications." } }, { "@type": "Question", "name": "What tolerances can CNC milling achieve?", "acceptedAnswer": { "@type": "Answer", "text": "CNC milling tolerance capability depends on material, feature type, machine quality, and setup rigidity. For aluminum alloys (6061-T6, 7075-T6), standard tolerances of ±0.005 inches (±0.127 mm) are easily achievable, with precision features routinely held to ±0.001 inches (±0.0254 mm) and critical bores or bearing fits achievable to ±0.0005 inches (±0.0127 mm). Steel and stainless steel parts typically hold ±0.002 to ±0.005 inches on general machined features. Hole position tolerances using precision boring cycles can achieve ±0.001 inches true position. Surface finishes as-milled typically range from 63 to 125 Ra (microinches), with fine finishing passes achieving 32 Ra or better. Plastics like Delrin and PEEK can be milled to ±0.002 inches with care. Customers should clearly callout critical tolerances on drawings so Olympus Machining can apply appropriate machining strategies, tooling, and inspection methods." } }, { "@type": "Question", "name": "What is multi-axis CNC milling?", "acceptedAnswer": { "@type": "Answer", "text": "Multi-axis CNC milling refers to machining operations that utilize more than the standard 3 linear axes (X, Y, Z). 3-axis CNC milling moves the cutting tool along three perpendicular linear axes and is sufficient for most prismatic parts — flat faces, pockets, holes, and simple contours. 4-axis CNC milling adds rotation around one axis (typically the A-axis, rotating the workpiece), enabling features on the sides of a part without re-fixturing, which improves accuracy and reduces setup time. 5-axis CNC milling simultaneously controls movement along three linear axes plus two rotational axes (A and B, or A and C), allowing the cutting tool to approach the workpiece from virtually any angle. 5-axis machining is used for complex aerospace components, turbine blades, mold inserts, and intricate medical parts. Multi-axis milling reduces the number of setups required, improving dimensional accuracy by eliminating re-fixturing errors and reducing cycle time." } }, { "@type": "Question", "name": "How long does a CNC milling project take?", "acceptedAnswer": { "@type": "Answer", "text": "CNC milling lead times vary based on part complexity, material availability, order quantity, and current shop capacity. For prototype machining at Olympus Machining, simple to moderately complex parts in aluminum can often be completed in 5 to 10 business days from receipt of approved drawings and material confirmation. More complex parts or specialty materials may require 2 to 3 weeks for prototypes. Production runs are scheduled based on quantity and setup complexity — small production runs of 25 to 100 pieces typically require 2 to 4 weeks, while larger runs may be quoted with longer lead times. Rush or expedited services may be available depending on capacity. The best way to get an accurate lead time estimate is to submit your drawing and quantity requirements to info@olympusmachining.com. Providing complete drawings with all tolerances and specifications upfront speeds the quoting and planning process." } }, { "@type": "Question", "name": "What file formats does Olympus Machining accept for CNC milling?", "acceptedAnswer": { "@type": "Answer", "text": "Olympus Machining accepts a variety of CAD and drawing file formats for CNC milling projects. Preferred 3D CAD formats include STEP (.stp, .step) — the most universally compatible format for CNC machining — and IGES (.igs, .iges), which is also widely supported. SolidWorks native files (.sldprt, .sldasm) are accepted directly. Parasolid (.x_t, .x_b) files are also supported. For 2D drawings, PDF is the standard format for engineering prints with dimensions, tolerances, and notes. DXF and DWG formats (AutoCAD) are accepted for 2D profiles. For best results, submit both a 3D STEP file (for geometry) and a 2D PDF drawing (for tolerances, surface finish callouts, notes, and material specification). Parts without toleranced drawings will be machined to general ±0.005 inch tolerances unless otherwise specified. Providing complete drawings ensures accurate quoting and proper machining." } }, { "@type": "Question", "name": "What is the difference between CNC milling and CNC turning?", "acceptedAnswer": { "@type": "Answer", "text": "CNC milling and CNC turning are both subtractive CNC machining processes, but they differ in how material is removed and the types of parts they produce. In CNC milling, the workpiece is held stationary (in a vise or fixture) while a rotating multi-point cutting tool moves across multiple axes to remove material. Milling excels at producing prismatic parts — blocks, plates, brackets, housings, and enclosures — with features like pockets, slots, holes, and complex contours. In CNC turning, the workpiece itself rotates on a lathe spindle while a stationary single-point cutting tool moves linearly to remove material. Turning is optimized for cylindrical and round parts such as shafts, bushings, spacers, threaded fasteners, and pins. Many parts require both processes: milled first to create the basic shape, then turned for cylindrical features, or vice versa. Olympus Machining offers both CNC milling and CNC turning, making it a single-source supplier for complex parts requiring multiple operations." } }, { "@type": "Question", "name": "Can Olympus Machining mill custom prototypes?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. Custom prototype milling is a core capability at Olympus Machining LLC. The shop regularly produces single-piece prototypes, validation sets of 2 to 10 pieces, and first-article parts for engineering review. Fast-turn prototype machining allows development teams to test fit, form, and function quickly before finalizing designs for production. Olympus Machining provides design-for-manufacturability (DFM) feedback as part of the prototype quoting process, flagging features that may be difficult to machine, unnecessarily expensive, or likely to cause quality issues in production. This collaborative approach reduces design iterations and accelerates time-to-production. Prototype parts are machined using the same quality standards as production parts — including first-article inspection and dimensional documentation — so approval of a prototype directly translates to production confidence. Once a prototype is approved, Olympus Machining can seamlessly transition to production quantities using documented setups." } } ] } ] } ] --- [Home](/) [CNC Milling](/cnc-milling) [CNC Turning](/cnc-turning) [Quality Assurance](/quality-assurance) [CNC Machining Capabilities](/capabilities) [CNC Machining Services](/cnc-machining) [Quality Program](/quality) [Contact Olympus Machining](/contact) [Prototype to Production](/prototype-to-production) [Industries Served](/industries-served) [Materials Machined](/materials-machined) [Robotics & Automation Machining](/robotics-automation-machining) [Precision CNC Machining](/precision-cnc-machining) [Compliance & Cybersecurity](/compliance) [Privacy Policy](/privacy-policy) [Blog](/blog) [Sitemap](/sitemap) [Pennsylvania CNC Machining](/areas-served/pennsylvania-cnc-machining) [Maryland CNC Machining](/areas-served/maryland-cnc-machining) [Virginia CNC Machining](/areas-served/virginia-cnc-machining) [Delaware CNC Machining](/areas-served/delaware-cnc-machining) [New Jersey CNC Machining](/areas-served/new-jersey-cnc-machining) [New York CNC Machining](/areas-served/new-york-cnc-machining) [Ohio CNC Machining](/areas-served/ohio-cnc-machining) [West Virginia CNC Machining](/areas-served/west-virginia-cnc-machining) [Washington DC CNC Machining](/areas-served/washington-dc-cnc-machining) [North Carolina CNC Machining](/areas-served/north-carolina-cnc-machining) [Aerospace Machining Tolerances Explained](/blog/aerospace-machining-tolerances-explained) [Titanium CNC Machining for Aerospace](/blog/titanium-cnc-machining-aerospace) [Aerospace CNC Machine Shop Near DC/MD](/blog/aerospace-cnc-machine-shop-near-washington-dc-maryland) [Cutting-Edge CNC Shop for Aerospace](/blog/cutting-edge-cnc-machine-shop-aerospace-industry) [Best CNC Machine Shop in Hanover, PA](/blog/best-cnc-machine-shop-hanover-pa) [QMS: Precision, Traceability, Process Control](/blog/quality-management-system-qms-precision-traceability-process-control) [Vet a CNC Shop in Pennsylvania](/blog/vet-cnc-machine-shop-pennsylvania-aerospace-defense-robotics) [CNC Shops in Rural America: Hanover, PA](/blog/cnc-machine-shop-rural-america-hanover-pa) [Aerospace CNC Machining in Pennsylvania](/blog/aerospace-cnc-machining-pennsylvania) [CNC Prototyping in PA](/blog/cnc-prototyping-pa) [CNC Machining in Pennsylvania](/blog/cnc-machining-pennsylvania) [Choosing CNC Machining Vendors](/blog/choosing-machining-vendors-cnc-machining-shop) [CNC Machining for Robotics — Guide](/blog/cnc-machining-for-robotics-automation-guide) [CNC Machining Parts for Robotics](/blog/cnc-machining-for-robotics-automation) [Prototype-to-Production CNC Machining](/blog/prototype-to-production-cnc-machining) [How OEMs Evaluate CNC Machine Shops](/blog/how-oems-evaluate-cnc-machine-shops) [CMM Inspection at Olympus Machining](/blog/cmm-inspection-enhances-quality-and-repeatability-at-olympus-machining) [ITAR & CMMC Level 1 in Precision CNC Machining](/blog/itar-cmmc-level-1-precision-cnc-machining) [Precision CNC Machining in Hanover, PA](/blog/precision-cnc-machining-hanover-pa) [AS9102 First Article Inspection Checklist](/blog/as9102-first-article-inspection-checklist) [AS9102 First Article Inspection](/as9102-first-article-inspection) [AS9102 FAI vs PFAI](/as9102-fai-vs-pfai) [AS9102 Balloon Drawings](/as9102-balloon-drawings) [CMM Inspection Services](/cmm-inspection-services) [Medical-Grade Alloys](/materials/medical-grade-alloys) [CMMC Level 1 Compliance](/compliance/cmmc-level-1) [Olympus vs Xometry](/comparison/olympus-vs-xometry) [Olympus vs Protolabs](/comparison/olympus-vs-protolabs) [Direct Shop vs Marketplace](/comparison/direct-shop-vs-marketplace) [Aerospace & Defense Machining](/industries/aerospace-defense) [Medical Device Machining](/industries/medical-devices) [Firearms & Suppressor Machining](/industries/firearms-suppressors) [Energy & Oil/Gas Machining](/industries/energy-oil-gas) [Philadelphia CNC Machining](/areas-served/philadelphia-cnc-machining) [Pittsburgh CNC Machining](/areas-served/pittsburgh-cnc-machining) [Baltimore CNC Machining](/areas-served/baltimore-cnc-machining) [Titanium CNC Machining](/materials/titanium-cnc-machining) [PEEK CNC Machining](/materials/peek-cnc-machining) [Inconel CNC Machining Guide](/materials/inconel-cnc-machining-guide) ![Olympus Machining LLC logo — precision CNC machining shop in Hanover, Pennsylvania](/assets/olympus-logo-DbWcTX06.webp) HomeAboutServices[Blog](/blog)Contact[Careers](/careers)[(717) 634-5094 ](tel:+17176345094)[Login](/auth)Get Quote [Back to Home](/) # CNC Milling Services — Precision Machined Components CNC milling is a subtractive manufacturing process that uses computer-controlled rotary cutting tools to remove material from a workpiece, producing parts with complex geometries and tight tolerances. Olympus Machining LLC is a CNC machining shop in Hanover, Pennsylvania that provides precision CNC milling services for OEMs and manufacturers nationwide. Whether you need a single prototype or ongoing production quantities, our CNC milling operations deliver accurate, repeatable components backed by disciplined processes and rigorous inspection. As a reliable [precision CNC machining](/precision-cnc-machining) vendor, every job is planned, machined, and verified using documented procedures. CNC milling is ideal for manufacturers, OEMs, and engineering teams who require machined parts that meet exact specifications. Working with a dedicated [CNC machining shop](/) ensures process control, quality documentation, and consistent results from first article through production. ## CNC Milling Capabilities Multi-axis CNC milling for complex geometries Tight-tolerance machining to meet demanding specifications Complex part geometries including pockets, contours, and 3D surfaces Short-run prototypes and full production quantities Aluminum, steel, stainless steel, brass, copper, and plastics ## From Prototype to Production Olympus Machining supports projects from initial concept through full-scale production. Whether you need a single first-article part for validation or ongoing production runs, our CNC milling processes remain consistent and documented at every stage. Flexible scheduling and scalable capacity allow smooth transitions as programs grow. We work with customers to establish repeatable setups and maintain process control, ensuring that production parts match approved first articles without variation. ## Quality Assurance and Inspection Quality is verified at every stage of our CNC milling process. First-article inspection confirms that initial parts meet all print requirements before production begins. In-process verification catches deviations early, and final inspection ensures every shipped part conforms to specification. Our facility uses precision measuring equipment including digital calipers, micrometers, height gauges, and surface plates to verify critical dimensions. Inspection results are documented and available upon request. ## Why Choose Olympus Machining Made in the USA — locally operated in Hanover, Pennsylvania Disciplined processes with documented procedures Clear communication throughout every project Reliable delivery and consistent quality ## CNC Milling Process — How It Works Every CNC milling job at Olympus Machining follows a structured, repeatable process from drawing review through final inspection. Understanding each step helps customers prepare better documentation and set realistic expectations for quality and lead time. ### 1\. Drawing Review and DFM Feedback Before any material is ordered or programming begins, our team reviews the customer's drawing or 3D model for completeness and manufacturability. We flag features that may drive up cost unnecessarily — such as extremely tight tolerances on non-critical surfaces, deep narrow pockets that require special tooling, or undercuts that require 4- or 5-axis fixturing. Design-for-manufacturability (DFM) feedback is provided as part of the quoting process at no additional charge, helping customers avoid expensive design revisions later. ### 2\. Material Selection and Procurement Once a quote is approved, material is sourced from trusted domestic suppliers. Material certifications (mill certs) are obtained and retained for traceability, which is especially important for defense, aerospace, and medical programs. For ITAR-controlled jobs, material sourcing follows applicable regulatory requirements. Selecting the correct stock size and form — plate, bar, or billet — minimizes waste and machining time, directly benefiting part cost. ### 3\. CAM Programming — G-Code Generation from 3D Model Our machinists use CAM (computer-aided manufacturing) software to generate the G-code that drives the CNC mill. The programmer imports the 3D model, defines stock, selects cutting tools, and creates toolpaths — roughing passes to remove bulk material, semi-finishing passes to approach final dimensions, and finishing passes to achieve specified surface finish and tolerances. Toolpath simulation is run before any cutter touches metal, catching collisions and verifying part geometry. ### 4\. Workholding Setup — Vise, Fixtures, and Soft Jaws Rigidly holding the workpiece is essential for accuracy. Simple rectangular or square parts are typically held in precision CNC vises. Oddly shaped parts or high-volume production runs use custom fixtures or soft jaws — aluminum or steel jaws machined to conform to the part's profile — that locate the workpiece repeatably from one piece to the next. Proper workholding minimizes vibration (chatter), prevents part movement during cutting, and is critical to achieving tight tolerances. ### 5\. Tool Selection and Toolpath Optimization Cutting tool selection directly impacts surface finish, cycle time, and tool life. Carbide end mills, drills, reamers, and boring bars are selected based on material, feature geometry, and required finish. Toolpath strategies such as high-efficiency milling (HEM), trochoidal milling, and adaptive clearing reduce cutting forces and heat, extending tool life while improving material removal rates. Feed rates and spindle speeds are dialed in during first-piece testing and locked into the program for consistency. ### 6\. First Piece Machining and Inspection The first part off the machine is inspected thoroughly against the engineering drawing before production continues. Critical dimensions, hole positions, depths, and surface finishes are verified using calibrated measuring instruments — calipers, micrometers, height gauges, and surface comparators. Any deviations are corrected in the program or setup before the production run begins. First-article inspection (FAI) documentation can be provided for customers who require it. ### 7\. Production Run with In-Process Verification During production runs, in-process checks are performed at defined intervals to catch tool wear or drift before it produces out-of-tolerance parts. Statistical sampling or 100% inspection is applied based on drawing requirements and customer needs. Any adjustments to offsets or feeds are documented. This systematic approach ensures that the last part off the machine is as accurate as the first. ### 8\. Final Inspection and Documentation Before shipping, completed parts undergo final inspection against the engineering drawing. All critical dimensions called out on the print are measured and recorded. Material certifications, inspection reports, and any certifications of conformance are packaged with the shipment. For defense and aerospace customers, Olympus Machining can support additional traceability requirements such as lot control and serialization. ## Materials We CNC Mill Olympus Machining mills a wide range of metals and engineering plastics to serve customers across robotics, defense, aerospace, medical, and industrial markets. Material selection affects machinability, cycle time, tooling cost, and final part performance — our team can advise on the best material for your application during the quoting process. ### Aluminum Alloys Aluminum is the most commonly milled metal at Olympus Machining. It machines quickly, produces excellent surface finishes, and works well with anodize, powder coat, and chromate conversion coating post-processing. - 6061-T6 — The most widely used aluminum alloy in precision machining. Excellent machinability, good corrosion resistance, and strong enough for most structural applications (40 ksi yield strength). Anodizes well for decorative and functional finishes. Typical tolerances to ±0.001". Used for brackets, housings, enclosures, plates, and structural components across nearly every industry. - 7075-T6 — Aerospace-grade aluminum with significantly higher strength than 6061 (73 ksi yield, 83 ksi tensile). Harder to machine and does not anodize as cleanly, but delivers an outstanding strength-to-weight ratio for defense, aerospace, and high-performance applications. Tolerances to ±0.001". Common in UAV frames, weapon system components, and structural aerospace parts. - 2024-T3 — High fatigue resistance makes this alloy a traditional choice for aircraft structural applications. Less common than 6061 or 7075, but available for programs that specify it. Not as corrosion resistant — typically clad or primed for protection. ### Carbon and Alloy Steels Steel offers higher strength, hardness, and wear resistance than aluminum. Material cost and cycle times are generally higher, but steel is required when loads, temperatures, or wear demands exceed what aluminum can handle. - 1018 Low-Carbon Steel — One of the easiest steels to machine. Weldable, affordable, and widely available in bar and plate. Good for pins, shafts, fixture components, and general structural parts where high strength is not the primary requirement. - 4140 Chromoly Steel — Available in pre-hardened condition (Rc 28–34) or annealed for easier machining before heat treatment. Excellent combination of toughness, wear resistance, and fatigue strength. Used for gears, tooling, die components, structural parts, and anything that needs to withstand cyclic loading. - 4340 High-Strength Alloy Steel — A step above 4140 in strength and toughness. Used for landing gear components, high-load defense hardware, and critical structural parts. Requires slower feeds and more robust tooling than lower-alloy steels. - 12L14 Free-Machining Steel — Contains lead as a machinability additive, resulting in the fastest cycle times of any standard steel grade. Not weldable and not suitable for high-stress applications, but ideal for high-volume turned or milled components where speed matters. ### Stainless Steels Stainless steels offer corrosion resistance that carbon steels cannot match. They are more challenging to machine — work hardening is a common issue — but the right grade, tooling, and feeds produce excellent results. - 303 Stainless — Free-machining grade with sulfur addition. The easiest stainless to machine, making it ideal for shafts, fittings, fasteners, and connectors where high corrosion resistance is not the top priority. - 304 Stainless — The most common general-purpose stainless. Good corrosion resistance for food processing, medical, and marine environments. Tends to work-harden; requires sharp tools and appropriate feeds to prevent galling. - 316 Stainless — Superior corrosion resistance versus 304 due to molybdenum content. Preferred for chemical processing equipment, marine hardware, and medical instruments that contact saline or chloride environments. - 17-4 PH Stainless — Precipitation-hardened stainless with exceptional strength (up to 190 ksi tensile in H900 condition). Best machined in the annealed or H1150 condition, then aged to final hardness. Used in defense valves, aerospace fasteners, pump components, and high-strength medical tooling. ### Engineering Plastics High-performance plastics can be precision-milled to tight tolerances and offer advantages in weight, electrical insulation, and chemical resistance that metals cannot match. - Delrin (Acetal / POM) — Outstanding dimensional stability, low moisture absorption, and low coefficient of friction. A go-to material for bushings, gears, cams, insulators, and precision sliding components. Machines similarly to aluminum and holds tolerances to ±0.002". - UHMW Polyethylene — Ultra-high molecular weight polyethylene is extremely impact resistant and has one of the lowest friction coefficients of any plastic. Used for wear strips, guides, conveyor components, and impact pads where toughness and low friction matter more than dimensional precision. - PEEK — Polyether ether ketone is a high-performance engineering polymer rated for continuous use up to 480°F with excellent chemical resistance. Used in aerospace brackets, medical implant-adjacent components, and semiconductor equipment. Expensive material; slow feeds and sharp tooling are critical. - Nylon 6/6 — Good wear resistance, moderate tensile strength, and low cost compared to PEEK. Used for gears, bushings, and structural brackets in lower-temperature, lower-load applications. ### Brass and Copper - C360 Free-Machining Brass — Excellent machinability (rated 100% on the machinability index). Used for fluid fittings, connectors, valve components, and decorative hardware. Machines faster than any steel or aluminum alloy at equivalent complexity. - C110 Electrolytic Tough Pitch Copper — 99.9% pure copper with very high electrical conductivity (101% IACS). Used for bus bars, heat sinks, electrical contacts, and RF shielding components. Softer than brass and requires careful fixturing to avoid distortion. ## CNC Milling Tolerance and Surface Finish Reference The tables below provide reference values for achievable tolerances and surface finishes by material. Actual results depend on part geometry, feature size, fixturing rigidity, and cutting parameters. Always specify critical tolerances on your engineering drawing — Olympus Machining's team will confirm achievability during the quoting process. ### Tolerance by Material Material Standard Tolerance Precision Tolerance Notes Aluminum 6061-T6 ±0.005" ±0.0005" Excellent machinability Aluminum 7075-T6 ±0.005" ±0.001" Harder, slower feeds required Carbon Steel 1018 ±0.005" ±0.001" Easy to machine Alloy Steel 4140 ±0.005" ±0.001" Pre-hard condition adds difficulty Stainless 303 ±0.005" ±0.001" Free-machining grade Stainless 304/316 ±0.005" ±0.002" Work hardens; needs sharp tools Stainless 17-4 PH ±0.005" ±0.001" Machine in H900–H1150 condition Delrin (Acetal) ±0.005" ±0.002" Stable, low thermal expansion PEEK ±0.005" ±0.002" Expensive material; slow feeds required ### Surface Finish Reference Surface finish is measured in Ra (roughness average). As-milled surfaces are typically 63–125 µin Ra. Additional finishing passes, polishing, or secondary processes achieve finer finishes. Specify the required Ra value or reference a surface finish symbol on your engineering drawing. Finish Ra (µin) Ra (µm) Method Typical Application As-milled (rough) 125 3.2 Standard end mill Non-critical surfaces As-milled (fine) 63 1.6 Finishing pass General machined surfaces Fine finish 32 0.8 Light cuts, sharp tools Bearing surfaces, seals Mirror / polish 16 0.4 Polishing after milling Optical, medical ## Types of CNC Milled Parts Olympus Machining mills precision components for a broad range of industries and applications. Below are representative part types by market segment — contact us if your application is not listed. ### Robotics and Automation Robotic systems demand lightweight, precise structural components with tight hole patterns and mounting interfaces. Olympus Machining regularly mills end-of-arm tooling (EOAT) mounting plates, actuator housings, sensor brackets, linear motion carriage components, and custom gripper fingers for collaborative and industrial robotic systems. These parts often require multiple setups and precise hole-to-hole relationships for alignment with servo motors, cameras, and pneumatic actuators. See our [robotics and automation machining](/robotics-automation-machining) page for more details on capabilities for this market. ### Defense and Aerospace Defense and aerospace programs require machined components with certified materials, documented inspection, and strict traceability. Olympus Machining is ITAR registered and mills weapon system brackets, UAV structural parts, communication equipment enclosures, mounting hardware, and avionics housings for programs requiring controlled handling and documentation. Material certifications and certificates of conformance are provided as a matter of course. See our [compliance and ITAR information](/compliance) for more details on how Olympus handles controlled programs. ### Medical Devices and Surgical Instruments Medical applications often require biocompatible materials, exceptional surface finishes, and dimensional repeatability. Olympus Machining mills surgical instrument housings, implant test fixtures, diagnostic equipment structural components, and instrument trays from stainless steel, titanium-adjacent alloys, and PEEK. Surface finish requirements are stringent, and full dimensional inspection documentation supports device validation activities. Visit our [industries served page](/industries-served) to learn more about our medical device machining work. ### Industrial Equipment and Tooling Industrial OEMs rely on precisely machined structural components to build reliable machinery. Olympus Machining supplies machine frames, bearing blocks, motor mounts, custom tooling fixtures, jig plates, and production tooling components in steel, aluminum, and stainless. These parts often have straightforward geometry but require tight flatness, parallelism, and perpendicularity tolerances to function correctly in assembled equipment. ### Commercial and Electronic Products Commercial product OEMs need machined parts that look and function right from the first unit. Olympus Machining mills electronic enclosures, heat sinks, RF shielding housings, connector housings, and custom hardware for commercial product programs. Aluminum 6061-T6 with anodize finish is the most common combination for this category, balancing machinability, appearance, and corrosion resistance at competitive cycle times. ## CNC Milling vs Other Manufacturing Methods Choosing the right manufacturing process for your part is critical to achieving the right balance of cost, lead time, accuracy, and material properties. CNC milling is the right choice in many situations — but not all. Here is how milling compares to other common processes. ### CNC Milling vs 3D Printing (Additive Manufacturing) CNC milling delivers tighter tolerances (±0.001" versus ±0.005"–±0.020" typical for FDM/SLA), better surface finish, and parts made from real production-grade metals and engineering plastics — not approximations. 3D printing excels at complex internal geometries, lattice structures, and topology-optimized shapes that cannot be machined with any tool. For most functional metal parts, milling produces superior mechanical properties, dimensional accuracy, and surface quality. 3D printing is best suited for early concept models, investment casting patterns, or parts where internal channels make machining impractical. ### CNC Milling vs CNC Turning Milling is the right process for prismatic parts — blocks, plates, brackets, housings, and enclosures with pockets, slots, and complex contoured surfaces. CNC turning is optimized for cylindrical and round parts: shafts, bushings, spacers, threaded fasteners, and pins. Many complex parts require both: milled for the outer form, then turned for internal bores and cylindrical features. Olympus Machining offers both processes under one roof — review our [CNC turning services](/cnc-turning) to understand when turning may be the right choice for your component. ### CNC Milling vs Waterjet and Laser Cutting Waterjet and laser cutting are 2D processes — they cut profiles and shapes from sheet or plate material but cannot machine pockets, counterbores, threads, or 3D surface contours. CNC milling produces true 3D features and achieves much tighter dimensional and positional tolerances. Waterjet and laser cutting are fast and cost-effective for flat 2D profiles when the part does not require machined features, tight tolerances, or controlled surface finishes. Many parts are waterjet-cut for their outer profile and then CNC milled for any machined features — a hybrid approach that minimizes raw material waste. ### CNC Milling vs EDM (Electrical Discharge Machining) EDM (wire and sinker) is capable of machining extremely hard materials (Rc 60+), producing very fine internal corners (near-zero radius), and achieving tolerances and surface finishes that milling cannot match in hard tool steels and carbides. However, EDM is significantly slower and more expensive than CNC milling for the vast majority of parts. CNC milling is faster, more cost-effective, and capable of much higher material removal rates. For most applications — even in difficult stainless steels and alloy steels — milling is the preferred process, with EDM reserved for features or materials where milling is not physically capable of achieving the required result. Have a part ready to quote? [Get Started](/#submission) ## From the Olympus Machining Blog [Aerospace CNC Machining in Pennsylvania ](/blog/aerospace-cnc-machining-pennsylvania)[CNC Machining in Pennsylvania: Why Local Matters ](/blog/cnc-machining-pennsylvania) ## Related Services [ ### CNC Turning Services Precision CNC lathe machining for shafts, bushings, and cylindrical components. View Service ](/cnc-turning)[ ### Quality Assurance & Inspection First-article inspection, in-process verification, and final inspection. View Service ](/quality-assurance)[ ### Prototype to Production Seamless support from early-stage prototypes to full production runs. View Service ](/prototype-to-production)[ ### Precision CNC Machining High precision CNC machining for tight tolerances and critical applications. View Service ](/precision-cnc-machining) [ ### Submit Your Project Tell us about your project requirements and get started with Olympus Machining. Get Started ](/#submission) ## Frequently Asked Questions About CNC Milling ### What is CNC milling? ### What materials can be CNC milled? ### What tolerances can CNC milling achieve? ### What is multi-axis CNC milling? ### How long does a CNC milling project take? ### What file formats do you accept for CNC milling? ### What is the difference between CNC milling and CNC turning? ### Can you mill custom prototypes? 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