In precision machining, quality control is not a final inspection desk after parts leave the machine—it is a proactive engineering system spanning raw material certification through final dispatch.
Three Pillars of CNC Quality Assurance
1. Incoming Material Verification
Inconsistent alloy hardness or uncertified raw bar stock will cause dimensional drift even on the finest 5-axis CNC machine. Every raw material lot is verified against EN 10204 3.1 mill test certificates for chemical composition and mechanical properties.
2. First Article Inspection (FAI)
Before releasing a batch for serial production, the very first machined component undergoes a 100% ballooned dimensional and GD&T audit against the engineering drawing. Serial chip removal never begins until FAI sign-off is completed.
3. In-Process Statistical Process Control (SPC)
At scheduled sampling intervals during production, critical bores, shaft journals, and depths are verified with calibrated plug gauges, micrometers, and surface profilometers—correcting tool offsets well before tolerances approach upper or lower limits.