U
ser
'
s
G
Uide
— 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 / 4 t
SIZe
1/4 –
INCH
2 6 t
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. Change the Thread Grip Percentage to 50% and calculate
the new Cut Tap and Roll Tap Drill Sizes:
5 0 g t
(% 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)