4th axis harmonic drive build

jbolt said:
The X & Y axis on my PM-932 CNC conversion are driven by timing belts. No rigidity or positioning issues.
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Good to know, as I'm planning to convert my PM-25MV someday and I have limited space around the machine for the Y axis stepper either front or back. I expect a belt would work okay for a 4th axis on the input side of a gearbox like this, as any errors would be reduced by 1/45 (or whatever gear ratio you have).
 
Great job Jay! I've really enjoyed watching your process on this project. When can you start working on mine?
 
Jonathans said:
Great job Jay! I've really enjoyed watching your process on this project. When can you start working on mine?
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Thanks. I'll add yours to my to-do list right away. Alas the list is already pretty long, plus my wife keeps adding things at the top, so you might better go ahead on your own. :)
 
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