Medical CNC Machining Applications
The kinds of medical device parts we route to vetted CNC shops in southern Vietnam: what each application asks of the machining, which materials are usual, and what gets inspected before a lot ships. You keep the regulatory file; the shop makes the part to your drawing.
Application overview
Each row shows a typical starting point. Your drawing, quality agreement and risk analysis decide the real requirements; capability numbers are confirmed per drawing at quote stage.
| Application | Typical parts | Usual materials | Features that drive cost | Typical inspection |
|---|---|---|---|---|
| Surgical instruments | Jaws, shafts, drivers, drill and cutting guides, ratchet parts | 17-4 PH, 316L, PEEK / PPSU handles | Edge condition, small radii, heat-treat distortion, pin bores | Profile, hardness per lot, visual edge standard |
| Orthopedic components | Bone screws, plates, trial implants, spinal hardware, instrument case inserts | Ti-6Al-4V ELI, CoCrMo, 316LVM, PEEK | Thread forms, hex and torx recesses, 5-axis contours, deburr in cannulations | Thread gauges, recess gauges, CMM on contours |
| Dental | Abutments, implant analogs, handpiece parts, scan bodies | Ti Grade 5 / ELI, CP Ti Grade 2, 316L, PEEK | Micro features, connection geometry, Swiss-type turning, burr-free edges | Optical measurement, connection gauges |
| Diagnostic and monitoring equipment | Housings, fluid manifolds, valve bodies, optical mounts, sensor brackets | 6061 / 7075 aluminum, POM, PTFE, PEI, 316L | Flatness, sealing faces, internal channels, cosmetic finish | Flatness, leak-relevant surface finish, anodize thickness |
| Fixtures and tooling | Assembly and test fixtures, gauges, holding fixtures, nitinol shape-setting fixtures | Tool steel, stainless, aluminum, POM | Locating accuracy, hardened wear surfaces | CMM on locators, hardness where specified |
Surgical instruments
Reusable instruments live through hundreds of cleaning and steam sterilization cycles, so the machining is judged by how the part survives reprocessing as much as by dimensions. Typical work is 17-4 PH or 316L bodies with milled jaws, slots and pin bores, sometimes paired with PEEK or PPSU handles.
Heat treat sequence
17-4 PH parts are usually roughed, aged to the condition on the drawing (for example H900 or H1025) and then finished on critical features, because ageing shrinks the part slightly. The sequence is agreed in the quote.
Edges and burrs
A burr that breaks off in a patient is a design failure as well as a shop failure. Specify edge breaks, mark cosmetic and functional surfaces, and agree a visual standard at FAI.
Cleanability
Hinges, lumens and blind holes trap soil. Generous radii, open slots and electropolish on 316L help your reprocessing validation.
Orthopedic components
Orthopedic work is mostly titanium and cobalt-chromium on 5-axis mills and turn-mill or Swiss-type lathes: bone screws with cannulations and drive recesses, plate trials, spinal rods and connectors, and the instruments and case inserts that go with them. Material is bought to ASTM F136 or F1537 with mill certificates traceable to heat number, and the certificate travels with the lot.
| Feature | What to put on the drawing | How it is usually checked |
|---|---|---|
| Bone thread (e.g. HA, HB, HD profiles per ISO 5835 / ASTM F543 as specified) | Profile standard, major / minor diameter, lead, run-out zone | Optical comparator, thread gauges |
| Hex / hexalobular drive recess | Recess size, depth, gauge reference | Go / no-go recess gauge, depth measurement |
| Cannulation | Bore diameter, straightness, burr-free exit | Pin gauge, borescope or sectioning on FAI |
| Contoured plate surfaces | Profile tolerance to datums | CMM scan against CAD |
Background: Orthopedic surgery on Wikipedia. Implant classification, fatigue testing and clinical claims belong to the device maker.
Dental components
Dental parts are small and connection geometry is everything: an abutment or analog has to seat on an implant system with no rock. These are classic Swiss-type and turn-mill parts in titanium, plus handpiece components in stainless steel where bearings and small gears need concentric bores. Optical measurement is used where a CMM probe is too large for the feature.
Abutments and analogs
Ti-6Al-4V ELI or CP Ti from certified bar. The interface geometry is usually defined by the implant system owner, so the drawing and its gauge references must come from the device maker.
Handpiece and instrument parts
Stainless shafts, heads and housings with bearing seats, where runout and bore concentricity matter more than any single size. Bearing fits are called with ISO 286 tolerance classes.
Diagnostic and monitoring equipment parts
Not every medical part touches a patient. Analyzers, imaging systems and monitors need machined aluminum housings, fluid manifolds with internal channels, valve bodies, optical mounts and sensor brackets. Requirements look more like precision industrial work: flatness of sealing faces, cosmetic anodize, clean internal passages and documented materials. Anodize Type II or Type III, bead blast and laser marking are available as secondary processes.
Fixtures, gauges and production tooling
Device makers also need tooling: assembly fixtures, inspection nests, test jigs, go / no-go gauges and nitinol shape-setting fixtures. These parts do not enter the device, but their accuracy decides whether the device is made right. Typical materials are tool steel, stainless, aluminum and POM, with hardened locating surfaces where wear is expected.
What fits, and what does not
Good fit
Turned and milled precision parts from a few millimetres to a few hundred millimetres long, prototypes through small and mid batches, mixed-material machined assemblies, parts that need FAI, mill certificates and lot traceability.
Not a fit
Sterile finished devices, cleanroom assembly, electronics, large weldments, castings, sheet metal, and nitinol laser-cut components. Regulatory submissions are always yours.
This is a sourcing and coordination service. The device maker owns design controls, verification and validation, biocompatibility, cleaning and sterilization validation, labeling and UDI. No FDA registration, ISO 13485 certificate or cleanroom is claimed on this site. See quality & documentation.
Related pages and guides
- Medical-grade materials and grade designations
- Tolerances, finishes and secondary processes
- Surgical instrument machining in 17-4 PH and 316L
- Orthopedic component machining in Ti-6Al-4V
- Dental handpiece and instrument component machining
- Machined parts for patient monitoring and imaging equipment
Application questions
Which medical applications are the best fit for this service?
Small to medium precision parts where geometry and documentation both matter: instrument components, orthopedic screws and trial parts, dental abutments and handpiece parts, diagnostic equipment housings and manifolds, and the fixtures used to make or test them. Large weldments, castings, sheet metal and electronics assembly are not a fit.
Can you source finished, sterile, packaged implants?
No. The shops machine and finish parts to your drawing and ship them clean and bagged to an agreed standard. Final cleaning to a validated process, sterile packaging, sterilization and labeling are done by you as the device maker or by your validated contractor. No FDA registration or ISO 13485 certificate is claimed on this site.
Do you handle mixed-material assemblies?
Yes, when the parts are machined. A bill of materials with titanium, stainless and PEEK parts can be quoted together and inspected as a set. Assembly steps such as press fits, pinning or thread locking are confirmed per drawing at quote stage.
What volumes do these applications usually run at?
Prototypes of 1 to 10 pieces typically ship in 2 to 3 weeks including the FAI report, and small batches of 10 to 500 pieces in 3 to 5 weeks. Higher volumes are quoted per part. Every lead time is confirmed against your drawing.
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