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Investment Casting Hole Tolerance
A cast hole's roundness is affected by the surrounding metal. If an uneven mass is adjacent, the hole will be pulled out of round. If the surrounding metal is symmetrical, holes up to ½" diameter can be held to ±.005" based on a plug gage check. Larger holes may be affected by interior shrinkage or pulling, and the foundry should be consulted.
Figure 3 above shows how a heavier section close to the hole distorts the shrinkage pattern. The hole diameter is distorted by the additional shrinkage of the heavier section. The figure graphically shows the pattern of distortion present to a greater or lesser degree in every casting with heavier mass affecting shrinkage.
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