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Investment Casting Straightness
Mil. Std. 8 specifies "a tolerance covering the straightness of an axis is the diameter or width within which the axis must lie."Thus, to correctly measure axial straightness of a shaft, bar, or plate, the tolerance zone within which the axis or axial plane lies must also be measured.
Straightness may be a real problem with certain types of castings. A relatively thin, short part may bend while a long, heavy part may not. Experience tells the foundry a given design may bend, but experience cannot indicate to what extent. As a rough guide, a constant section will usually have an axial bow of .005" per inch. Ribs and gussets will inhibit warpage, but also hinder mechanical straightening of whatever warpage occurs.
Questions about investment casting straightness? Contact us today.
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