BLANK DIAMETER SELECTION
FOR CIRCULAR PITCH KNURLING WHEN KNURLING FROM THE "CROSS SLIDE". 
The following formula can be used to determine
an approximate blank diameter for proper tracking. This blank diameter
can be adjusted for optimal results once good tracking has been established.
It is advisable to do all test rolling at the same speed and feed as is
planned for the production run.

* C.F. = Tracking Correction Factor 
This correction factor takes into account the fact that the tips of the knurl teeth have penetrated below the blank diameter by the end of the first revolution. Several other formulas can be derived to calculate almost any aspect that may be required. (For approximate C.F. values see Table II.) 

The approximate tolerance for the knurl diameter should be: 

If the finished diameter of the part is known, an approximate blank diameter can be determined by subtracting the proper value from Table I. 
BLANK DIAMETER SELECTION
FOR DIAMETRAL PITCH KNURLING 
Blank diameters for diametral pitch knurling dies are more easily computed, since they are always common fractional sizes. The formula is as follows: 

American Standard ASA B94.61984 describes the diametral
pitch knurl system. Diametral pitch knurls are designed to track uniformly
on fractional size stock up to 1" in multiples of 1/32" or 1/64".
They are held to closer tolerances for this purpose. The American Standard recommends that the use of 64 Diametral Pitch knurls be avoided as much as possible, and that preference be given to the use of 96 D.P. knurls for simplification of tooling. (For Equivalent Normal Circular TPI see Table III.) The number of teeth that will be rolled can be easily determined by multiplying the blank diameter by the Diametral Pitch of the knurl. Example: A 96 D.P. knurl will roll 96 x 1/2 = 48 teeth on a 1/2" diameter stock. 

NOTE: Unfortunately the above formulas do not hold precisely
for all conditions. Sometimes apparently identical knurls from different
manufacturers will not track on the same blank diameters due to a difference
in the sharpness of the teeth. Also, it is possible for the number of
teeth rolled on a part to change as the knurling tool wears. How deeply
the knurl penetrates into the work blank on the first revolution is the
main factor in determining if an adjustment should be made to the basic
formula. Some factors which affect this penetration are: 
