Investment CastingLost-wax castings · Stainless, carbon & alloy steel
Secondary operations
Machined investment castings
Most investment castings have a few features that must be machined: bores, threads, sealing faces and datum surfaces. We supply castings heat treated, machined and finished to your drawing.
The machining allowance is typically about 0.5–1.5 mm on silica sol castings and somewhat more on water glass castings. It is agreed at the drawing review together with the casting datums, so the first machining operation clamps on stable cast surfaces and the rest of the part stays as-cast.
Operations
- CNC milling, turning and drilling
- Threading and tapping
- Heat treatment: annealing, solution treatment, aging, quench and temper
- Shot or sand blasting
- Passivation, polishing and electropolishing
- Plating, painting and powder coating
- Deburring and final inspection
Machining and finishing FAQ
Can you supply fully machined castings?
Yes. Castings can be supplied machined, heat treated and surface finished to the drawing, ready for assembly.
How much machining allowance is left on an investment casting?
Typically about 0.5–1.5 mm per side on silica sol castings, more on larger parts and water glass castings. The allowance is agreed at the drawing review and only added to faces that are machined.