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d mm
2
1.047
2
1.302*
3
1.553
3
1.732*
4
2.071
4
2.217
Note: the values with *
Adjusting the instrument:
Select the plain cap-shaped measuring accessories and use a method for finding a
"turn-over point" to calibrate approximately the parallelism of the cap-shaped measuring
accessories. Then use one pin to check cap-shaped measuring accessories. If required, it
is needed to check the parallelism accurately. Mount the center carrier to support the
workpiece. Fix the tailstock position to make the worktable in the middle of stroke.
Remove the workpiece and make the two cap-shaped measuring accessories contact to
reset and return the instrument back to the measuring spindle. Move the worktable up or
down to make the axial line of the center and the measuring axial line coplanar. Mount
the 3-pin carrier and make the cap-shaped measuring accessories contact with the
workpiece. Insert the 3-pin into the thread hole according to Fig.16. Adjust the worktable
and make it rotate around the vertical axis to find the minimum reading "turn-over point"
(M). Remove the workpiece and check if the zero point moves.
Depend on the thread length, we normally measure the pitch diameter in several radial
section and check each radial section at two directions with 90
error in workpiece pitch diameter.
The result is calculated for pitch diameter
d
2
¡
5
5
6
6
8
8
= M
d[1+1/Sin(
/2)]+P/2
¢
¢ ¢ ¢
¡ ¡ ¡ ¡
26
d mm
¡
2.595
10
2.886
12
3.106
16
3.287
20
4.141
24
4.211
32
¡
are used for go-gauge.
interval to find shape
¡
Ctg(
/2)
¡ ¡ ¡
¡
¢ ¢ ¢
¢
d mm
¡
5.176
6.212
8.282
10.353
12.423
16.565
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