Posted 09 February 2014 - 09:13 PM
Posted 10 February 2014 - 03:02 AM
Have a friend that has a large set of rulers that are "off". Ok, not really "off" he was a die maker and the rulers were made special that way to cover for shrinkage of the wood and other materials that he worked with. They look normal till you start to compare them next to each other. He has won a few bets with them.
Shrink Rules - used primarily in foundry pattern making. Patterns must be enlarged to provide a cavity that is larger than the final part to compensate for the shrinkage of the part as the metal cools. Some of our large manganese steel patterns are a couple inches longer than the cold part, the hot metal shrinks that much as it cools.
Posted 10 February 2014 - 05:29 PM
I'm surprised your still using Pi Tapes.
Laser measuring for large diameters has become so accurate.
Several years (1970's) and a couple life times ago. We built, machined and assembled Commerical and Navy Nuclear Power Plants. Finished BWR6 Reactor with Internals weighted 1148Tons without the vessel head. A very good way to measure a 266" O-Ring Groove on a VBM.
I am in the Railway Turnout business now. Rarely see a tolerance smaller than the little mark on a pocket tape.
Posted 10 February 2014 - 09:12 PM
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