High-Precision Acetal (POM) CNC Machined Parts Supplier
Overview
XCM CNC can plan precision Acetal and POM machining around critical tolerances, fixture datums, and CMM inspection for gears, valve seats, and locator structures defined by the drawing.
For dimensional stability, fatigue resistance, and precision-machining requirements, the process focuses on crystallization stress, micro-burr control, and post-process reinspection while the sample stage verifies position, fit holes, and low-friction sliding interfaces.
Key Capabilities
- Materials: Delrin, Celcon, POM-H, POM-C by drawing review
- Tolerance: +/-0.03 mm standard, +/-0.005 mm selected critical features by drawing review
- Surface Finish: Ra 3.2 um milled, Ra 1.6 um precision, Ra 1.6 um turned or bored
- GD&T: Coaxiality 0.012 mm, runout 0.01 mm, cylindricity 0.011 mm
- Max Size: Milling 3000 x 1600 x 1400 mm, turning diameter 1250 x 2000 mm
- Surface Treatment: Deburring, edge smoothing, anti-burr review, or marking by drawing review
- Thread: M2-M220, NPT, BSP, G, PT
- Precision Limit: +/-0.005 mm tolerance, 0.006 mm roundness, 0.01 mm hole position for selected features by drawing review
POM GD&T Control for Precision Datums
POM precision datums can achieve 0.02 mm flatness and 0.015 mm position tolerance when the drawing defines the primary datum and fixture constraints. Critical datum faces, mounting holes, and degree-of-freedom sensitive structures need confirmation through a one-setup CMM inspection plan. A Hexagon Inspector Classic 06.08.06 CMM can measure position, flatness, and profile features on precision projects.
POM Single-Setup Coaxiality for Hole Patterns
POM hole patterns can reach 0.01 mm hole position and 0.012 mm coaxiality when they are machined in a single setup against the same fixture datum. Fit holes in gears, valve cores, and small locator structures need selected +/-0.005 mm precision with allowance for elastic recovery. Fit-face tolerances should still follow POM material behavior and crystallization stress rather than direct metal standards.
Acetal Surface Roughness Grading for Mating Features
POM mating features can combine Ra 1.6 um bored faces with Ra 1.6 um turned diameters for critical-fit evaluation. Roundness at 0.006 mm and runout at 0.01 mm on holes, end faces, and coaxial features need confirmation with a Leader NCA8106 roundness tester and a TRIMOS 600L height gauge. Roughness still needs verification against actual assembly behavior as well as the measured Ra value.
POM Post-Finish Reinspection for Critical Areas
POM critical areas can maintain selected +/-0.005 mm features after edge-smoothed or anti-burr finishing when reinspection follows the same datum plan. Deburred critical zones need renewed checks of 0.02 mm flatness and 0.015 mm position tolerance. A WanHao Rational VMS-3020G 2.5D system can review edge profile and post-deburr dimensional change.
Specifications
| Product Name | High-Precision POM CNC Machined Parts Supplier |
|---|---|
| Manufacturer | XCM CNC |
| Factory Location | Shenzhen, Guangdong, China |
| Quality System | ISO 9001, ISO 13485, IATF 16949, GJB9001C |
| Machining Process | CNC machining |
| Material | POM |
| Material Grade | Delrin, Celcon, POM-H, POM-C by drawing review |
| Tolerance | +/-0.03 mm standard CNC machining tolerance |
| Precision Tolerance | +/-0.005 mm for selected critical features by drawing review |
| Surface Roughness | Ra 3.2 um milled, Ra 1.6 um precision, Ra 1.6 um turned or bored |
| Surface Treatment | Deburring, edge smoothing, anti-burr review, or marking by drawing review |
| Max Part Size | Milling 3000 x 1600 x 1400 mm / Turning diameter 1250 x 2000 mm |
| Inspection | CMM (Hexagon Inspector Classic 06.08.06), roundness tester (Leader NCA8106), height gauge (TRIMOS 600L), roughness tester, 2.5D video measuring machine (WanHao Rational VMS-3020G) |
| Application | Gear datum features, precision valve cores, locator-pin interfaces |
| Typical Application | Precision acetal machining with fit control |
| Key Features | Dimensional-stable POM machining, crystallization review, GD&T control, datum-based inspection |
| Critical QC Requirements | Material traceability, burr-control review, fit-surface inspection, tooth-profile or datum check, post-process reinspection |
| Batch Range | Prototype to precision repeat orders |
| MOQ | 1 Piece |
| Typical Lead Time | 10-15 business days after drawing review |
| Drawing Formats | STEP, IGS, DWG, PDF, X_T |
| Secondary Process | Deburring, edge smoothing, anti-burr review, marking, and post-machining reinspection |
| Material Certificate | Material certificate by order requirements |
| Material Feature | Dimensional-stable engineering plastic, low-friction precision motion review, burr-control focus |
| Critical Tolerance Control | Flatness 0.02 mm, position tolerance 0.015 mm, hole position 0.01 mm by drawing review |
Applications
Gear Tooth Features and Shaft-Bore Datums
Typical Parts: Precision gear, cam, worm wheel
Acetal dimensional stability, low friction, and elastic recovery suit low-noise precision drive parts. Gear teeth, shaft bores, and meshing datum faces can be checked for 0.015 mm position tolerance and 0.012 mm coaxiality, while Ra 1.6 um fit surfaces still need roughness verification.
Valve-Core Sealing Faces and Valve-Seat Holes
Typical Parts: Valve core, valve seat, pump component
Low friction, self-lubrication, and dimensional stability make POM suitable for precision sliding and sealing fits in valve-core and valve-seat assemblies. Sealing-face flatness at 0.02 mm, flow-hole position at 0.01 mm, and assembly-datum coaxiality at 0.012 mm can be checked with height-gauge and roundness support.
Locator-Pin Holes and Guide-Face Features
Typical Parts: Locating pin, guide part, fixture bushing
High stiffness, fatigue resistance, and dimensional stability suit locating pins, guide parts, and fixture bushings that repeat positioning cycles. Positioning-hole accuracy at 0.01 mm, guide-face parallel control, and datum flatness can be organized in one setup and rechecked by CMM.
Insulator Slots and Clip-Position Features
Typical Parts: 5G base-station filter tuning knob, optical-transceiver heatsink clamp bracket, test-fixture locating pin
Acetal spring behavior and low friction suit connector insulators, clips, and elastic latch parts. Slot-width tolerance around selected +/-0.005 mm, latch position tolerance at 0.015 mm, and locating-hole coaxiality at 0.012 mm can be checked with combined 2.5D and CMM inspection.
Why Choose Us
Certified Quality System and Precision POM Coverage
XCM CNC organizes Acetal and POM projects under ISO 9001, ISO 13485, IATF 16949, and GJB9001C aligned quality processes, with DMG, Mazak, Matsuura, and Brother equipment covering high-precision turning and milling. Gear, valve-core, locator, and motion-component programs can confirm grade selection, crystallization control, burr management, and mating-surface requirements during drawing review.
Size Range from Small Connectors to Large Precision Structures
The machining range covers small connector-scale parts, gears, valve cores, locator pins, connector precision parts, larger guide plates, low-friction sliders, and weight-reduction structures used as metal alternatives. Milling travel reaches 3000 x 1600 x 1400 mm and turning capacity reaches diameter 1250 x 2000 mm, subject to fixturing, material grade, crystallization behavior, and fit requirements.
Tiered Equipment Strategy for Low-Cost CNC Machining, Quality-Assured Production
XCM CNC uses four equipment tiers from mainland China, Taiwan, Japan, Europe, and the US. Standard-tolerance operations can run on domestic or Taiwan equipment, while higher-precision features move to imported machines such as DMG and Mazak. Equipment is matched to actual tolerance needs so cost stays aligned with the drawing.
Complete Inspection Equipment for Precision POM
A Hexagon Inspector Classic 06.08.06 CMM can measure position, flatness, and coaxiality. A Leader NCA8106 roundness tester can verify 0.006 mm roundness and 0.011 mm cylindricity. A TRIMOS 600L height gauge can support flatness and parallel checks, while a WanHao Rational VMS-3020G 2.5D system can inspect edge profiles after deburring.
Tolerance Grading for Precision POM Features
Selected +/-0.005 mm tolerance, 0.01 mm hole position, and 0.006 mm roundness apply only to suitable features and are not generalized to every POM structure. Process review still grades the tolerance approach against the drawing, material grade, structural layout, and inspection method, while standard +/-0.03 mm and Ra 3.2 um remain the baseline route.
FAQ
How do you measure GD&T on precision Acetal parts?
Position tolerance, flatness, and coaxiality are usually measured with a Hexagon Inspector Classic 06.08.06 CMM. Roundness and cylindricity can be checked with a Leader NCA8106 roundness tester, and flatness or parallel features can also use a TRIMOS 600L height gauge. The final inspection plan still depends on the drawing datum and sampling frequency.
What are the precision tolerance limits for POM machining?
Selected +/-0.005 mm precision, 0.01 mm hole position, and 0.006 mm roundness are suitable only for specific features and need evaluation against the grade, structure, one-setup process, and inspection method. Standard +/-0.03 mm and Ra 3.2 um still cover most general POM structures.
How do you organize CMM inspection for high-precision POM parts?
CMM inspection starts by confirming the drawing datum, fixturing method, and inspection frequency. Full first-article inspection validates the process route, while in-process sampling and critical-dimension tracking support repeat stability. Report format and data output can still follow order requirements.
How do you control burrs on small or precision Acetal parts?
Small-feature burrs are controlled through toolpath planning, stock allowance, deburring, and reinspection together. Micro holes, micro slots, and critical fit surfaces still need the machining sequence matched to the part size, batch, and inspection requirement. A 2.5D system can recheck dimensional change after deburring.
How do you ensure mating-surface roughness on POM parts?
Mating-surface roughness at Ra 1.6 um is typically achieved through precision turning or boring. A roughness tester verifies the Ra value, while actual assembly testing is still important to confirm the fit-surface behavior in use. Roughness targets need to match the tolerance and fit grade.
What inspection equipment do you use for precision POM parts?
The common inspection set includes a Hexagon Inspector Classic 06.08.06 CMM, Leader NCA8106 roundness tester, TRIMOS 600L height gauge, roughness tester, and WanHao Rational VMS-3020G 2.5D system. The final equipment selection still depends on the inspection item, accuracy target, and batch size.
Request a CNC Machining Quote from XCM CNC
Send us your drawings. Our team will review the file and reply with a machining quote. MOQ: 1 piece, with competitive low-cost pricing.
Email: [email protected] | WhatsApp: +8618638951317
