High-Precision Polycarbonate (PC) CNC Machined Parts Supplier

XCM CNC provides precision Polycarbonate (PC) CNC machining with process plans organized around critical tolerances, GD&T control, and CMM inspection for safety windows, transparent panels, and impact-resistant housing features. Certified to ISO 9001 and ISO 13485, it uses Hexagon CMM, TRIMOS height gauges, DMG, and Mazak for precision work. MOQ is one piece. For transparent-face flatness, mounting-hole position, and assembly mating faces, the process focuses on stress cracking, edge chipping, and post-annealing reinspection, checking GD&T features item by item in samples.

Polycarbonate (PC) Precision Datum GD&T Control with CMM Verification

PC precision datum faces can use 0.02 mm flatness and mounting-hole groups 0.015 mm position, with Hexagon CMM data issued feature by feature. Critical datums, assembly holes, and degree-of-freedom-sensitive structures are completed in one fixture to reduce accumulated error from re-fixturing. Since PC rebounds more than metal, datum faces are allowed to stabilize before final measurement.

PC Hole Position and Coaxiality for Precision Assembly

PC mounting-hole groups can use 0.015 mm position and selected 0.012 mm coaxiality by drawing review, cross-validated by Hexagon CMM and WanHao VMS-3020G video measurement. Mating holes in large transparent guards and impact panels are assessed for thermal expansion and fixture stress effects on hole shrinkage. Roundness of 0.006 mm applies to precision turned shaft features; milled holes follow actual drawing requirements.

PC Surface Roughness Grading for Transparent and Mating Features

PC faces are graded by function: Ra 3.2 um regular milling, Ra 1.6 um precision mating faces, and Ra 2.5 um standard turning. Transparent and cosmetic faces require consistent cutting-mark direction with no visible marks and receive piece-by-piece cosmetic confirmation after polishing. Roughness and size tolerance are assessed together so a compliant Ra value does not hide a dimensional failure.

PC Post-Annealing Reinspection for Critical GD&T Features

After annealing, PC parts recheck selected 0.02 mm flatness and 0.015 mm position to confirm heat treatment has not caused excess deformation. Key assembly faces after edge polishing use a TRIMOS 600L height gauge for datum height and CMM for hole-position shift. Annealing temperature and soak time are confirmed by PC grade and wall thickness; FR PC and clear PC use different parameters.

Complete Quality System and Equipment Coverage

The factory organizes quality processes around ISO 9001, ISO 13485, IATF 16949, and GJB9001C, using DMG, Mazak, Matsuura, Brother, and other equipment for polycarbonate transparent parts, impact-resistant windows, and large protective guards. Drawing review for PC transparent panels, flame-retardant parts, and medical-device housings can confirm stress control, polishing, and protective packaging together.

Broad Size Coverage

Machining covers needs from small connectors to large structural parts, including PC transparent windows, impact-resistant panels, small covers, larger guards, medical-device housings, and flame-retardant transparent parts. Three-axis travel reaches 3000 x 1600 x 1400 mm and turning diameter reaches 1250 mm; the production plan is confirmed for fixturing, stress-cracking risk, polishing, and transport protection.

Tiered Equipment Strategy for Low-Cost CNC Machining, Quality-Assured Production

XCM CNC uses CNC equipment from mainland China, Taiwan, Japan, and Europe or the United States. Lower-tolerance operations can run on domestic or Taiwan machines, while high-precision work uses imported equipment such as DMG and Mazak. Matching equipment to actual precision requirements reduces machining cost while meeting drawing requirements.

Graded Inspection of Precision Features

Position, flatness, and mating dimensions are assessed by drawing grade: Hexagon CMM checks precision features point by point and WanHao video measurement confirms regular dimensions in batches. PC rebound and thermal expansion differ from metal, so inspection is scheduled after annealing and stabilization rather than on transient values. NDA signing is available for precision drawings.

PC Annealing and Stress Control as an Up-Front Process

Stress cracking, edge whitening, and transparent-face deformation are addressed through tool selection, feed parameters, fixture-force control, and annealing reinspection. Annealing temperature and soak time follow PC grade and wall thickness; GD&T features are remeasured after annealing before polishing and packaging proceed.