50 — Ma c h i n i s t ca l c ™ Pr o
3-Wire Measurement – Known Thread Size and Wire Size
Note: When solving for 3-Wire Measurements and Pitch Diameters, the
calculator assumes the equivalent External Thread Type if an Internal
Thread Type is set (i.e., Internal 2B is assumed External 2A for U.S.
Threads; Internal 6H is assumed External 6H for Metric Threads).
-
KEYSTROKE DISPLAY
OO
0.
1. Enter the Thread Size:
3/8
t
SIZE 3/8
–
INCH
2. Enter the Threads per Inch and store the nal Thread Size:
16t
THRED
SIZE
$
3/8
–
16
INCH
3. Set the Thread Class to 2A:
2gb
* (Thread Class)
EXT 2A
* If necessary, continue pressing
b
until the desired External Thread
Class is displayed.
4. Enter the Wire Size*:
.04gf
(Wire Size)
WIRE
SIZE
$
0.04 INCH
5. Find the Minimum 3-Wire Measurement:
gR
(3-W Measure) 3WMIN
SIZE 0.3946 INCH
6. Find the Maximum 3-Wire Measurement:
R
3WMAX
SIZE 0.3990 INCH
7. Find the Minimum Pitch Diameter:
R
PTCH-
SIZE 0.3287 INCH
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