Total Quality Control (TQC) — DFM to OQC Inspection at ±0.01mm
JIERCHEN’s Total Quality Control (TQC) system checks every part at five gates — DFM, IQC, IPQC, FQC, and OQC — before it leaves Taiwan. Final dimensions are confirmed on a Keyence coordinate measuring machine (CMM) against ISO 2768-f general tolerances, verified to ±0.01mm.
Get a Free Quote See Our EquipmentFive Quality Gates
| Gate | What we check | Equipment / method | Standard |
|---|---|---|---|
| DFM Design for Manufacturability |
Engineers review the CAD file or 2D drawing before quoting, checking wall thickness, tool access, and tolerance callouts against the chosen process (SLA, CNC, casting, or injection molding). | CAD/CAM review in Mastercam and 3D/2D design software | ISO 2768-f tolerance feasibility check |
| IQC Incoming Quality Control |
Raw material stock and blanks — metal bar, plastic sheet, or resin — are checked against the material and dimension specification before machining begins. | Dimension instruments, material and color verification at the Color & Material Center | Material certificate match |
| IPQC In-Process Quality Control |
During CNC milling and SLA printing, operators verify each operation against a written SOP, checking setup, tool path, and in-progress dimensions before moving to the next step. | CNC machining centers (NSV106A), SOP checklist at each operation | Process SOP conformance |
| FQC Final Quality Control |
Finished parts are measured in full against the drawing before finishing or assembly, catching dimensional drift before it reaches the next stage. | Keyence coordinate measuring machine (CMM) | ISO 2768-f, ±0.01mm verified |
| OQC Outgoing Quality Control |
Before packaging, parts undergo a final visual, dimensional, and color check to confirm they match the approved sample and are free of shipping-related damage risk. | X-Rite Ci60 spectrophotometer for color match, final visual inspection | Color-difference tolerance, packaging inspection |
How a Part Moves Through Production
Once a design clears DFM review, JIERCHEN follows a fixed production sequence so every part receives the same discipline regardless of order size:
Engineers use Mastercam to program the cutter path and select tooling for each job, then CNC operators run the process against the SOP established during IPQC. After milling, parts move to surface finishing or subcontractor processes such as anodizing or plating, then to final assembly and outgoing inspection before shipment.
Certifications Behind Our QC System
| ISO 9001 | Certificate No. 10319/0, issued by AFNOR Certification |
|---|---|
| Tolerance standard | ISO 2768-f general tolerance |
| Dimensional verification | Keyence CMM, ±0.01mm |
| D-U-N-S Number | 65-774-7101 |
| Taiwan Unified Business No. | 34672266 |
Frequently Asked Questions
What does TQC stand for at JIERCHEN?
TQC stands for Total Quality Control, JIERCHEN’s five-gate inspection framework covering DFM, IQC, IPQC, FQC, and OQC, applied to every order regardless of process or volume.
What tolerance does JIERCHEN guarantee?
Parts are produced to ISO 2768-f general tolerances and verified on a Keyence coordinate measuring machine (CMM) to ±0.01mm at the FQC gate.
When does quality review start in the process?
At DFM, before a quote is finalized. Engineers review the CAD file or drawing for manufacturability and tolerance feasibility, which prevents costly rework once machining begins.
How is color consistency verified across a production run?
At OQC, parts are checked with an X-Rite Ci60 spectrophotometer to confirm color and finish match the approved sample within tolerance before shipment.
Is JIERCHEN’s quality system independently certified?
Yes. JIERCHEN holds ISO 9001 certification (Certificate No. 10319/0) from AFNOR Certification. See our full corporate background on the About JIERCHEN page.
Can you provide a dimensional inspection report with our parts?
Yes. At the FQC gate, critical dimensions are measured on our Keyence coordinate measuring machine (CMM) against your drawing, and a CMM inspection report can be provided with your order on request.
What tolerance standard applies to critical dimensions?
Critical dimensions called out on your drawing are held to ISO 2768-f general tolerances and verified on our Keyence CMM to ±0.01mm at the FQC gate, the same standard applied across our five-gate TQC system.
What happens between incoming material and outgoing shipment?
Incoming material and blanks are checked against the material and dimension specification at IQC, in-process dimensions are verified against a written SOP during CNC milling and SLA printing at IPQC, and before packaging every part passes a final visual, dimensional, and color check at OQC to confirm it matches the approved sample.
Put Our Five-Gate QC to Work on Your Parts
Send your drawing or CAD file and we’ll walk you through DFM feedback before you commit to a process.
Get a Free QuoteJIERCHEN Enterprise Co., Ltd. · No. 5, Alley 19, Lane 49, Guoqing Rd., Banqiao Dist., New Taipei City 220, Taiwan · +886-2-7728-5122 · sales@jierchen.com.tw · Mon–Fri 08:30–17:30
