Originally Posted by
angelw
Hi Jones'r
When cutting a parallel thread the P0 and P2 arguments must be the same value (the major diameter for an external thread). If these values are different, a tapered thread will result.
I note also that the P5 argument is quite small. This argument sets the depth of cut of the initial pass. If this value is a positive value, as in your example, the depth of cut of each successive pass will be diminished according to the the following algorithm, P5 * SQR(N), where N = the nth number of threading pass. Such a small initial pass will result in many thread passes being made. If this argument is expressed as a negative value, all thread passes will be clamped at the P5 value.
Regards,
Bill