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Indexing Question

P

PAC1

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I have an index head on my lathe with 1 to 24 stops. Can one of you turning experts explain the logic. For example if I want to create 3 flat surfaces 120 degrees apart is that 1, 8 and 16 pr 1, 9, 17 or some other. I tried drawing a parallel line to my lathe bed on a disc. I was hoping to see a triangle with 60 degree angles.
I probably need to try again marking from the centre vertically.
 
According to Record the index numbers are 1, 9 and 17.
 
I think of the index positions like the hours on a clock face, except that there are 24 rather than 12, so each step is 15 degrees. (360 divided by 24 is 15.)

If your starting position is at 12 o'clock, that's the same as position zero. You want to get to 4 o'clock, so move on 4 hours x 2, ie 8 steps. Then another 8 steps to get to 8 o'clock.

It doesn't really matter which is your starting position, you just need to be able to feel the number of steps round that you take.
 
I agree Andy. I think 24 I need to think of as 0 and 24 then it makes sense.
 
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