50 — Ma c h i n i s t ca l c ™ Pr o
Changing a U.S. Thread Classication
KEYSTROKE DISPLAY
g * ALL CLEARED
1. Set the calculator to U.S. Mode:
g S S S + US UnITS
2. Recall the current Thread Classication:
gb
(Thread Class)
INT 2B
3. Change to U.S. External Thread Class 2:
b
EXT 2A
4. Change to U.S. External Thread Class 1:
1gb
(Thread Class)
EXT 1A
5. Change to U.S. Internal Thread Class 1:
b
INT 1B
Fractional Thread Size Example
Find the available Internal and External Thread characteristics
for a 1/4", 28 TPI screw:
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
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General
Weight and Dimensions
