Thin-Wall CNC Housings: Define the Inspection State Before Quoting

Align the drawing and quote on thin-wall support, clamping release and functional inspection.

Distinguish machining support from acceptance

A thin-wall housing can be supported during cutting to improve stability, but the condition in which it is inspected should follow the drawing and intended function. A measurement taken while tightly clamped cannot automatically replace an unloaded result. If the assembly intentionally restrains the housing, define the accepted inspection restraint rather than leaving it to the inspector to guess.

Identify the features that drive the fixture

Mark functional mounting pads and faces and identify areas where clamp marks are unacceptable. Ask the supplier to identify features that can be measured only after releasing the workholding. If a trial uses a temporary support or process tab, define when it is removed and which dimensions must be rechecked afterward.

What to put in the RFQ

• Label the permitted support points
• define the inspection condition
• ask the supplier to report exceptions before the first-article release.

Technical reference: Sandvik Coromant’s milling vibration guidance.