XCX
I write about measuring machined parts and interpreting inspection results. My articles examine free-state versus constrained measurement and why coordinate measuring machine results can differ, helping readers ask how a part was held, measured, and compared with its drawing.
Contact vs Optical Inspection for CNC Parts: Which Measurement Route Fits?
By XCX · Updated September 2026 Short answer. contact vs optical inspection cnc parts is a feature-level decision. Contact methods physically sample selected surfaces; optical methods capture non-contact image, profile, or surface data. The better route depends on the feature,…
First Article vs First Piece Inspection: Key Differences
By XCX · Updated September 2026 First article vs first piece inspection is not a choice between two names for the same check. A machine shop may use first piece inspection to release a setup or defined production event, while…
How Measurement Uncertainty Changes a Tolerance-Limit Decision
A measurement uncertainty tolerance limit is a conformity-decision relationship among a product requirement, a measured result with uncertainty, and an agreed decision rule. A central value inside the drawing limit isn’t automatically low risk when its associated uncertainty extends beyond…
