shrink rule

shrink rule

[′shriŋk ‚rül]
(metallurgy)
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The difference between the actual casting dimension and the theoretical casting dimension calculated from the shrink rule is apparent.
3 Results and Conclusions--The difference between the actual casting dimensions and the theoretical casting dimensions from the shrink rule is apparent.
Calculations similar to those above indicate that a scale or shrink rule can only be used to measure patterns in which the casting feature tolerance is at least 0.900 in.
The layout or drawing is always drawn to full size, though generally not dimensioned, but having great accuracy and incorporating the shrink rule. Machining allowances, coreprints and specifications that define the casting should also be included.
Patternmakers use a shrink rule," a special linear scale different from a regular ruler.
In far too many foundries today, the belief is prevalent that the correct application of the shrink rule can solve dimensional accuracy problems.