The mechanical engineer's pocket-book. A reference-book of rules, tables, data, and formulæ, for the use of engineers, mechanics, and students (1910)
Kent, William, 1851-1918 · New York, J. Wiley & sons · leaf 273
h column of the table, which gives 6 to 7 thousandths of an inchallowance for fit and wear of tap. Just above the threaded portion of thetap a place is turned to the size given in the ninth column, these sizesbeing the same as those of the regular U. S. Standard bolt, at the bottomof the thread,… … Fig. 75. tap a tool is used which has a removable cutter finished accurately togauge by grinding, this tool being correct U. S. Standard as to angle,and flat at the point. It is fed in and the threads chased until the flatpoint just touches the portion of the tap which has been turned to size§.…
Mechanical engineering
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