TAPER TAILSTOCK OFFSET FORMULAS

To convert T.P.F. to T.P.I.       T.P.F./12

To convert T.P.I. to T.P.F.       T.P.I. x 12

To find T.P.I.  

To find tailstock offset 

T.P.F. = taper per foot 

T.P.I. = taper per inch

O.L. = overall length

T.L. = taper length

METRIC FORMULAS

To find Total Taper  

To find Large Diameter  

To find small diameter  

To find tailstock offset  

The letter "K" is the second number in the metric taper nomenclature.

Example, a taper has a 1:30 rate, that is, it changes 1mm in diameter for

each 30mm of length. The second number, in this case 30, is used in the

formula to find the large or small diameter of the taper when one or the

other piece of information is known.