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 Contours, Radii and Cams

When dimensioning a casting radius, it must be remembered that volumetric shrinkage occurs during cooling which affects external radii and contours. In a flat casting, concavity is easily illustrated and understood (refer to the Flatness section). The same concavity affects castings that have contours, but with more dramatic results.

Contours, Radii and Cams

In a concave radius, the greatest shrinkage occurs in the center and outer extremities. This tends to decrease the radius. When dimensioning a drawing of a concave radius (as in Figure 1 above), a reference radius should be used. Dimensions on the casting radius are then used to control basis physical size. The fit to mating configuration is then controlled by using a tolerance band on the radius.

Contours, Radii and Cams

In a convex radius, the greatest shrinkage alsi occurs in the center. This tends to increase the cast radius (as in Figure 2 above). The drawing should be dimensioned accordingly.

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