On Wed, 28 Feb 2001 beepeenacan@...
> I am converting a SOLO 200cc engine to turn a 36" propeller for a 1/2
> scale r/c plane. What is the best way to index 4 holes in the 2 1/2"
> hub(aluminum) for the 4, 1/4" bolts? I have made an adapter to fit
> the 3 or 4 jaw on the tailstock- should i just mount the hub in the 4
> jaw and use the setscrews as indexing "stops" with an allen wrench
> against a "stop"? How do i then get the drilling done (w/the bit in a
> collet) w/o it (tailstock) twisting ? I guess the stop wuold be placed
> on the direction the bit would rotate... ANY TIPS/SUGGESTIONS? does
> this make sense?! as you can tell i am new to this, but am
> confident....Thanks, BRAD
If you're indexing the holes into the flat end of the hub, it might be
easier to use layout tools to scribe the hole locations into the aluminum,
punch them, and drill them on a drill press.
If you're drilling these into the curved wall of the hub, indexing it on
the lathe might be easier (but you'll have to come up with a way to drill
I did some indexing with the 3-jaw and 4-jaw mounted to the headstock at
one point. (This is BEFORE I got the indexing plate from Nick!) I did it
by using a bubble level straddling two of the jaws of the chuck. My
tolerances were pretty loose, so this was close enough. I don't know how
keen I'd be to use that on a propeller. The thought of being off by even
a pretty small fraction of a degree on something that's going to be
spinning blades around really really fast just gives me the willies.
For cross-drilling, at one point I had a block that would hold a flex
shaft tool on the cross slide. Worked great... until my housemates moved
out and took their flex shaft tool with them. Right now I'm shopping
around for a nice Foredom. But not until my son's born and my wife is
back at work.
Best of luck with the propeller hub!