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General Mach Discussion / Re: Precise calibration but inconsistent incremental movements
« on: July 17, 2018, 12:45:50 PM »
Hi guys,
Thanks for your replys and input. After spending alot of time trouble shooting and testing different things which both of you guys touched on, I believe that the errors have been caused by an eccentric pinion. The circumference of my pinion is 137.4 mm, and when I MDI multiples of this distance form zero, the marks are hit spot on (as they should as they are full revolutions). However distances anywhere under this value can run long or short depending on where abouts they land on the rotation of the eccentric pinion. The pinions are probably the cheapest thing on my machine and I must have fallen lucky with the y/slave axis. I removed the pinion and measured the hole to be off centre by 0.15mm at worst. Anyway lesson learned, I'll do the machining myself with the new one. Thanks again for you time and sharing your knowledge.
Cheers
Chris
Thanks for your replys and input. After spending alot of time trouble shooting and testing different things which both of you guys touched on, I believe that the errors have been caused by an eccentric pinion. The circumference of my pinion is 137.4 mm, and when I MDI multiples of this distance form zero, the marks are hit spot on (as they should as they are full revolutions). However distances anywhere under this value can run long or short depending on where abouts they land on the rotation of the eccentric pinion. The pinions are probably the cheapest thing on my machine and I must have fallen lucky with the y/slave axis. I removed the pinion and measured the hole to be off centre by 0.15mm at worst. Anyway lesson learned, I'll do the machining myself with the new one. Thanks again for you time and sharing your knowledge.
Cheers
Chris