- Joined
- Aug 19, 2013
- Messages
- 764
Is your post tongue in cheek? Shrink rules are used by patternmakers to make foundry patterns to allow for the shrinkage of the metal after pouring. They are made in many ratios of shrinkage, called out in fractions of an inch per foot of length.
Shrink rules were also used in making thermo-forming dies for vacuum and pressure forming sheet plastics.