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3.
Check to see that worm gear is engaged and
locked into position—chuck should rotate
smoothly when crank is turned.
4.
Rotate crank to take up any play in worm gear
and zero table. Set crank arm pin into one of
the 17-hole circle holes (see Figure 27).
Note: It is important to always turn handle
in the same direction to avoid backlash and
maintain accuracy.
5.
Set sector arms so there are five holes
plus the hole the indexing pin is located in
between the arms.
Note: What is being measured is space
between holes. Five spaces need to be on
17
hole circle (which is imprinted on chosen
th
dividing plate) between sector arms (see
Figure 27).
Sector Arm
Sector Arm
Figure 27. Example of hole spacing.
6.
Tighten set screw on sector arms to secure
setting.
7.
Move sector arm so it rests against indexing
pin, as shown in Figure 27.
8.
Machine your first hole.
9.
Pull back on crank handle spring-loaded pin
to remove pin from dividing plate hole. Pull
pin out far enough to clear tops of sector
arms while you crank, so you won't bump
sector arms and lose your position.
Model T25937 (Mfd. Since 3/16)
1
2
3
4
5
Indexing
Pin
10. Rotate crank five full rotations.
11. After completing five full rotations, continue
cranking past five holes on 17-hole circle to
⁄
of a rotation. Set indexing
rotate exactly
5
17
pin in 5th (last) hole of sector (see Figure 28).
Figure 28. Pin set in last hole.
12. Rotate sector arm so arm rests on pin once
again (see Figure 29).
Figure 29. Rotating sector arm to rest against
new position.
13. From this new starting point, repeat
Steps 8–12 for the remaining holes.
Number
17 Hole
-19-
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