Call: 800.221.0419
Fax: 603.434.7880
(info@alcumet.com)

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AlCuMet Inc.
3 Planeview Drive
Londonderry, NH 03053

Toll Free: 800.221.0419
Call: 603.432.6220
Fax: 603.434.7880

Email: (info@alcumet.com)

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

Out of Straight

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.

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