Rotary project, maybe????

[claudef]

(09-26-2012, 05:54 PM)Rickabilly Wrote: I'll say it,
Wow, beautiful work Claude.
No Vernier scale yet? not that I'm picking, just curious
regards
Rick

The reason why there is no vernier is that I had not figured out how I would index the part with the accuracy needed.
My spin indexer has 36 holes on a 3.5" PCD... Now if you remember correctly, my worm is 40:1 ratio, 9 deg per turn. To read one deg on the dial I rotate it 40 deg's. There is 10 graduations @ 4 deg's spacing in between those larger marks.... So the vernier spacing need to be at 3.99 deg, 7.98, 11.97, etc.
To do this with the spin indexer I need to improvise.
If you look at the drawing attached, the large circle represents the 3.5" pcd of the indexer. Now if I put a pin in one hole and rotate the plate and pin onto a stack of Joe-Blocks and scribe one line then increase the stack by the amounts shown to scribe the other lines. I would be using the Spin indexer as a sine plate (somewhat).
Do you see any flaws in my approach.. Your comments would be welcomed.
Claude