Special alloys reward preparation and punish guesswork. Here is how we hold tolerances on the materials that defeat standard setups.
Invar is dimensionally stable but gummy; Kovar work-hardens; PEEK springs back. Each needs its own speeds, feeds and tool geometry.
Use rigid clamping and sharp tools. For plastics, manage heat so the part does not distort; for alloys, control work hardening with consistent depth of cut.
Special alloys often serve measurement or sealing roles — hold Ra and flatness, and verify with CMM rather than relying on visual checks.
It has low thermal conductivity and elastic memory; poor heat management causes size drift and poor finish.
Yes with stable fixturing and controlled temperature during machining and measurement.