Precision Casting Advantages

“Using investment casting instead of other manufacturing processes ensures that extensive secondary machining and finishing are unnecessary, and investment casting produces parts and components that don’t need welds, nuts, or bolts.”
– Russell Wilmarth, AlCuMet CEO

Precision investment castings, or “lost wax castings,” are designed to minimize the cost of producing close tolerance parts.

The cost of any part increases in proportion to the precision of its dimensional tolerance requirements, this is true of castings, as well as fabricated and machined parts. While careful machining can achieve closer tolerances than available in an investment casting, a critical design view will often permit minor expansion of tolerances, undercuts, blind holes, etc. to allow the higher production yields and lower piece costs possible with investment castings. If closer than cast tolerances are necessary, the machining required on an investment casting will still be substantially less than on conventional cast or fabricated pieces.

Factors Affecting Precision Investment Casting Tolerance, Dimensions and Surface Finish

Maintaining close dimensional tolerance in an investment casting is affected by many factors. Most of these factors can be controlled by the foundry, although minor “lot to lot” variations will occur. The tolerance bands provided for investment castings are determined by these uncontrollable factors.

 

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