CNC Machining of Stainless Steel
Stainless steel earns its place wherever corrosion resistance and hygiene matter. It also work-hardens as you cut it, which is exactly why toolpath strategy decides whether you hold tolerance or scrap the part.
Why it is hard to machine
Austenitic grades like 304 and 316 work-harden rapidly: the surface gets harder as the tool rubs, which accelerates wear and pushes cutting forces up. Heat stays at the edge because stainless conducts it poorly, and residual stress can move dimensions after machining.
Process controls that matter
Work hardening
Rubbing hardens the surface and kills tools. Sharp edges, constant feed and no dwelling keep the cut under the hardened skin.
Heat at the edge
Poor conductivity traps heat in the cutting zone. Targeted cooling and moderate speeds protect both tool and finish.
Post-machining movement
Residual stress can drift dimensions. Staged machining and controlled finishing keep critical features stable.
Tolerances, inspection and documentation
Typical applications
Medical instruments, food and pharmaceutical equipment, chemical hardware, semiconductor parts and laboratory fixtures.