I thought I understood External Thread cutting calculations but evidently I'm doing something wrong. From what I've read, if using a Sharp 60* V tool, which I am. the thread depth would be (P x 0.866), but when I follow this, my nut doesn't come close to screwing on.
Example: 12mm x 1.5
I cut my OD to 0.543"
I set Mach up Simple Threading Wizard for a OD or XStart to 0.543" and a Pitch of 0.0591"
I then calculate my depth (0.0591 x 0.866) = 0.0512" so
0.543" OD - 0.0512" = XEND of 0.4918"
In order to get a nut to screw on, I end up with XEnd around .465" or so.
Where am I going wrong?