How to specify surface roughness requirement on a drawing
A blanket Ra 0.8 note on a drawing adds cost nobody asked for. This guide explains Ra and Rz, ISO 1302 callouts, what casting, MIM, and CNC surfaces hold...
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Technical Guide
Swiss screw vs 3-axis CNC for small parts | Yujiaxin Tech
Swiss screw machining and 3-axis CNC both produce small precision metal parts, but they win in different situations. This guide compares geometry,...
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How to Know If a Part Is a Good Fit for Metal Injection Molding
They send a beautiful 3D model, every surface machined to perfection, and ask for ten thousand pieces at a price that only makes sense if the part grows on...
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CNC machining vs gear hobbing for prototype gears
I have spent 18 years sourcing prototype gears. The CNC vs gear hobbing question depends on quantity, tolerance, and how fast you need parts. CNC wins at...
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How to read a material certificate for stainless steel 316L
A practical guide to reading a stainless steel 316L material certificate: EN 10204 types, ASTM A240 chemistry limits, mechanical minimums, heat number...
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How to vet a Chinese metal parts manufacturer before ordering
Sourcing metal parts from China can save 30 to 50 percent on unit cost, or cost you six months of delay and a container of scrap. This guide covers five...
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