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Angular Indexing
Angular indexing is the process used to create
evenly spaced holes in a round workpiece. Always
ensure your rotary table is properly aligned on
the X-axis of the mill before beginning angular
indexing.
Basic Example:
You are making a flange and need to place six
holes 60° apart for the bolt pattern in Figure 22.
Hole
Figure 22. Example of flange layout.
Handwheel Rotations =
N = the desired division number (6).
/
= 15 full handwheel turns
90
6
15 turns = 60°
1.
Rotate handwheel before making first hole to
take up any play in worm gear.
2.
Make your first hole, then rotate handwheel
15 times.
Note: If you rotate handwheel too far, do not
back up to the number. You must back up
one revolution and dial back to the desired
number, then lock table in place to locate
the second hole. This procedure eliminates
errors due to backlash in worm gear.
Model T25937 (Mfd. Since 3/16)
The dividing plates divide a round surface into
even parts. Three dividing plates are included with
the Model T25937.
Components and Hardware Needed:
Dividing Plate 15, 16, 17, 18, 19 & 20 Hole ....... 1
Dividing Plate 21, 23, 27, 29, 31 & 33 Hole ....... 1
Dividing Plate 37, 39, 41, 43, 47 & 49 Hole ....... 1
Sector Arm ........................................................ 1
Sector Arm Spring ............................................. 1
Crank Handle w/Indexing Pin ............................ 1
Phillips Head Screws M5-.8 x 10 ....................... 3
60°
Tools Needed:
Hex Wrench 5mm .............................................. 1
Phillips Head Screwdriver .................................. 1
Flat Head Screwdriver ....................................... 1
To install dividing plate:
1.
2.
⁄
90
N
3.
4.
Figure 23. Installing dividing plate and placing
Installing Dividing
Plates
Remove handwheel cap screw and washer.
Remove handwheel and key from shaft. Tape
metal indexing key to handwheel for safe
keeping.
Insert dividing plate with counter bores fac-
ing out, and secure plate with (3) M5-.8 x 12
Phillips head screws, as shown in Figure 23.
Place sector arm assembly over the shaft, as
shown in Figure 23.
x 3
Sector Arm
sector arm assembly.
Qty
Qty
Dividing
Plate
-17-
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