Topics on how material, tolerances, surface finish and inspection requirements drive the technology and cost of a part.
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A bronze plain bearing bushing looks like a simple part — until it has to fit an existing housing and an existing shaft. Alloys, fits, lubrication and what belongs on the drawing.
Why stainless steel work-hardens under the tool, sticks to the cutting edge and distorts thin walls — and how choosing grade 1.4301, 1.4404 or 1.4057 affects the part cost.
An overview of coatings for CNC parts: anodising, zinc plating, blackening, passivation and powder coating. What each one does, how it changes the dimension and how to specify it on the drawing.
Why tight tolerances raise the cost of a CNC part and how to specify accuracy so you pay only for the critical dimensions — general tolerances, fits, IT grades and surface roughness.
Choosing the material for a CNC part without guessing: when to pick C45, when stainless steel and when aluminium.
