Us e r 's GU i d e — 51
t
(Rod Size for Cold Forming)
CFORM SIZE 4.5433 MM
t
(Max. External Pitch Diameter)
PTCH+ SIZE 4.4910 MM
t
(Min. External Pitch Diameter)
PTCH- SIZE 4.4350 MM
t
(Max. External Major Diameter)
MAJR+ SIZE 4.9780 MM
t
(Min. External Major Diameter)
MAJR- SIZE 4.8880 MM
t
(Max. External Minor Diameter)
MINR+ SIZE 4.1660 MM
Custom Thread Percentage (NOT AVAILABLE ON MODEL 4086)
The Machinist Calc and Machinist Calc Pro use a default
Thread Grip Percentage of 75% when calculating Tap Drill
sizes. With the custom Percentage Thread function on the
Machinist Calc Pro, you can enter a different value to calculate
Tap Drill sizes.
Calculate the Tap Drill Size for a 1/4 Inch, 26 TPI screw, then
change the Thread Grip Percentage to 50% and calculate the
new Tap Drill Size.
KEYSTROKE DISPLAY
g
*
ALL CLEArEd
1. Enter the Thread Size and calculate the Cut Tap and Roll Tap
Drill Sizes:
1/4t
SIZE 1/4 – INCH
26t
THRED SIZE 1/4 –
26
INCH
t
(Cut Tap Drill Size)
TAP DRILL SIZE 3
t
* (Roll Tap Drill Size)
R-TAP DRILL SIZE 5.9 MM
2. C
hange the Thread Grip Percentage to 50% and calculate
the new Cut Tap and Roll Tap Drill Sizes:
50gt
(% Thread)
THRD% SIZE 50.
t
THRED SIZE 1/4 –
26
INCH
t
(Cut Tap Drill Size)
TAP DRILL SIZE 1
t
* (Roll Tap Drill Size)
R-TAP DRILL SIZE 6. MM
KEYSTROKE DISPLAY
(cont'd)
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