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15.0 Indexer Positions
How to use the chart
A diagram of the indexer is shown at right, as
viewed from the tailstock end of the Lathe. Points
A, B and C are the holes in the head casting. The
holes in the spindle collar may be considered as
numbered 1 through 12.
Example: You wish to rout 9 flutes on your spindle
blank. Locate the “9” in the “No. of Flutes” column;
each flute angle will be 40°. The index pin should
first be inserted into hole combination “A-1”. Make
your first flute at this position. Back off the index
pin and rotate the spindle until the index pin can be
inserted into hole combination “A-5”; this will be
followed by “A-9”. Succeeding flutes will be made
with the index pin in the B position: “B-3”, “B-7” and
so on
No. of Flutes
360° divided by...
Angle Letter # Letter # Letter #
1 360.00 A 1
2 180.00 A 1,7
3 120.00 A 1,5,9
4 90.00 A 1,4,7,10
5 72.00 -----------------------
6 60.00 A 1,3,5,7,9,11
8* 45.00 A 1,4,7,10
9 40.00 A 1,5,9 B 3,7,11 C 1,5,9
10 36.00 -----------------------
12 30.00 A 1 to 12
15 24.00 -----------------------
16 22.50 -----------------------
18 20.00 A 1,3,5,7,9,11 B 1,3,5,7,9,11 C 1,3,5,7,9,11
20 18.00 -----------------------
24* 15.00 A 1 to 12
30 12.00 -----------------------
36 10.00 A 1 to 12 B 1 to 12 C 1 to 12
other interesting patterns....
9 ------ A 1,5,9 B 1,5,9 C 1,5,9
NOTE: A dashed line indicates that particular set of angles is not possible with the indexer.
* For 8 or 24 flutes, perform the first sequence, then rotate the workpiece by hand to the needed position and repeat
the same sequence.