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5.
Slide sector arm spring clip into slot on shaft
to hold sector arms tight against dividing
plate (see Figure 24).
Note: Loosen sector arm set screw to adjust
arm placement during indexing operation.
Figure 24. Inserting sector arm spring.
6.
Install crank handle with indexing pin and
secure it with washer and cap screw removed
in Step 1 (see Figure 25).
Crank
Handle
Figure 25. Tightening cap screw that secures
crank handle.
Note: The crank handle slot adjusts so index-
ing pin sits directly above hole circle chosen.
To ease installation, place pin in desired hole
circle, then tighten cap screw.
-18-
Indexing
Pin
Simple Indexing
Simple or plain indexing is the most common form
of indexing used because of the large number of
divisions available with the speed, repeatability,
and precision attained. Simple indexing is used
when milling multiple, even surfaces on a round
workpiece.
The Model T25937 has three dividing plates
with the following hole circles:
Plate: 15, 16, 17, 18, 19, 20.
Plate: 21, 23, 27, 29, 31, 33.
Plate: 37, 39, 41, 43, 47, 49.
Basic Example:
You are now making a flange with a hole pattern
that has 17 holes.
Crank rotations =
N = the desired division number (17).
⁄
90
17
1.
On index table on Page 20, look up 17 in
number of divisions column to find the correct
index circle plus required number of turns.
The number of rotations required in this case
is 5
⁄
rotations. The 17-hole circle dividing
5
17
plate is needed for
2.
Install 17-hole circle dividing plate onto rotary
table, as described earlier. Set crank handle
and indexing pin to index 17-hole circle
(see Figure 26).
Indexing Pin
Figure 26. Indexing pin placement.
Model T25937 (Mfd. Since 3/16)
⁄
90
N
= 5
⁄
5
17
⁄
of a rotation.
5
17
17 Hole
Dividing
Plate
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