Calculated Industries MACHINIST CALC PRO User Manual page 52

Changing a U.S. Thread Classification
KeysTRoKe
g *
1. Set the calculator to U.S. Mode:
g S S S +
2. Recall the current Thread Classification:
(Thread Class)
gb
3. Change to U.S. External Thread Class 2:
b
4. Change to U.S. External Thread Class 1:
(Thread Class)
1gb
5. Change to U.S. Internal Thread Class 1:
b
fractional Thread size example
Find the available Internal and External Thread characteristics
for a 1/4", 28 TPI screw:
KeysTRoKe
g*
1. Verify Thread Class is set to 2B:
(Thread Class)
gb
2. Enter the Thread Size:
1/4t
3. Enter the TPI and store the final Thread Size:
28t
4. Find the available Internal Thread characteristics:
(Cut Tap Drill Size)
t
50 — M
achinist
c P
alc™ ro
all CleaReD
Us UnITs
all CleaRed
sIZe
$
THReD 1/4 –
sIZe
TaP
DRIll sIZe
DIsPlay
InT 2b
eXT 2a
eXT 1a
InT 1b
DIsPlay
InT 2b
1/4 –
InCH
28
InCH
3