[ATM] Elgin machine turntable to stroke ratio

[Christopher Dalla Piazza]

I'm getting ready to build an Elgin machine and have found an appropriate 18 
rpm motor for the stroke rate but I'm reading that it is best to have the 
turntable turn faster, 2-3x the rate of stroke.  I'm thinking that you'd 
avoid edge troubles with this setup.

I can't figure out how to utilize the same motor to drive both the stroke 
and the turntable without some sort of gearing or belt mechanism and at that 
point, I'd rather just get two motors.

If I use the same motor to drive both, I'll end up the other way around, 
about 2-3 strokes for each rotation of the turntable.  I'm thinking this is 
closer to the way I'm polishing by hand right now.

So, does it really matter that much?

I'd rather have something simple unless there is a real benefit.

Thanks for any suggestions!

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