This section is from the book "Applied Science For Metal Workers", by William H. Dooley. Also available from Amazon: Applied Science For Metal Workers.
It is the practice in shrunk fits to allow 1/1000 of an inch for each inch in diameter.
To illustrate: A locomotive tire 68 in. in diameter should be turned 68 X 1/1000 in., or 68/1000in., smaller than 68 in. Expressed in a formula this is:
A = .001 X D = D /1000 in. Where A is allowance in inches, and D is diameter in inches.
 
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