46 — Ma c h i n i s t ca l c ™ Pr o
Fractional Thread Size
KEYSTROKE DISPLAY
g
*
ALL CLEAREd
1. Verify Thread Class is set to 2B:
gb
(Thread Class) INT 2B
2. Enter the Thread Size:
1/4t
SIZE
1/4 –
INCH
3. Enter the TPI and store the nal Thread Size:
28t
THRED SIZE
$
1/4 –
28
INCH
4. Find the available Internal Thread characteristics:
t
(Cut Tap Drill Size) TAP DRILL SIZE 3
t
(Roll Tap Drill Size)
R-TAP DRILL SIZE 5.9 MM
t
(Close Fit Drill Size)
CLOSE DRILL SIZE F
t
(Free Fit Drill Size)
FREE DRILL SIZE H
t
(Min. Internal Pitch Diameter)
PTCH- SIZE 0.2268 INCH
t
(Max. Internal Pitch Diameter)
PTCH+ SIZE 0.2311 INCH
t
(Min. Internal Minor Diameter)
MINR- SIZE 0.2110 INCH
t
(Max. Internal Minor Diameter)
MINR+ SIZE 0.2200 INCH
t
(Min. Internal Major Diameter)
MAJR- SIZE 0.2500 INCH
5. Switch to Thread Class 2A and nd the available External
Thread characteristics:
gbb
(Thread Class) EXT 2A
t
THRED SIZE $ 1/4 –
28
INCH
t
(Rod Size for Thread Cutting) ROD SIZE 0.2500 INCH
t
(Rod Size for Cold Forming) CFORM SIZE 0.2239 INCH
t
(Max. External Pitch Diameter)
PTCH+ SIZE 0.2258 INCH
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