Custom Thread Percentage - Calculated Industries 4088 User Manual

custom thread percentage

The Machinist Calc Pro 2 uses a default Thread grip
Percentage of 75% when calculating Tap Drill sizes. With the
custom Percentage Thread function, you can enter a different
value to calculate Tap Drill sizes.
Calculate the Tap Drill Size for a 0.25 Inch, 26 TPI screw, then
change the Thread grip Percentage to 50% and calculate the
new Tap Drill Size:
1. Enter the Thread size and calculate the Cut Tap and Roll Tap
Drill sizes:
.25it
t
t
t
t Minor DiaMeter
g* all cleareD
26t
t
t
t*
pitch DiaMeter
Min
MaJor DiaMeter
Max
MaJor DiaMeter
Min
Max
threaD siZe
2b
threaD siZe
2b 0.25 - 26 inch
threaD pitch
tap Drill siZe
#3
roll tap Drill
User's Guide — 49
4.435 MM
4.978 MM
4.888 MM
4.166 MM
0.
0.25 - inch
0.038 inch
0.213 inch
5.900 MM
(cont'd)