Tighter tolerance is not automatically better. For custom CNC machined parts, tolerance should match function. Overly tight requirements can increase cost, lead time, inspection difficulty, and scrap risk without improving the final assembly.
Tighter tolerance is not automatically better. For custom CNC machined parts, tolerance should match function. Overly tight requirements can increase cost, lead time, inspection difficulty, and scrap risk without improving the final assembly.
Critical bearing seats, locating holes, sealing surfaces, sliding fits, and assembly datum features may need tighter tolerance. Decorative or non-functional surfaces usually do not need the same control.
Many custom CNC parts can function well with +/-0.01 mm on key features. The exact feasibility depends on material, part size, geometry, clamping, process, and inspection method.
Very tight tolerance may require grinding, stable temperature, controlled inspection, special fixtures, or process changes. Buyers should mark which dimensions truly need this level of control.
A good drawing should separate critical dimensions from general tolerance. This helps the supplier quote correctly and inspect what matters most.
Use these pages when you are ready to compare process capability or send an RFQ.
Yes. Send the drawing, material, quantity, and critical requirements. We can review machining risk before confirming quotation.
No. They are buyer education pages. Final process, tolerance, and inspection decisions should be confirmed from the actual drawing.