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Author Topic: Mach 3 and 4th Axis  (Read 46643 times)

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Offline Greolt

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Re: Mach 3 and 4th Axis
« Reply #50 on: April 04, 2012, 05:34:01 AM »
  1.8 deg/step; 200 step/rev; 16 Pulse/step; 3200 Pulse/rev; 1 Multiplier; 5.08 threads/in;  1 thread start; .19685 in/rev; Calculation = 16256 Steps/inch. 
............ I have a timing belt from the stepper gear to the chuck drive with a 72 ratio.

I am sorry.  What you have said makes no sense to me.  You talk about threads per inch, and then a belt drive with a ratio of 72.

Any way it matters little.
I played around with numbers of 40 - 55 steps and the chuck moved very close when I MDI G0 A180

Around 40 to 55 was close.  Just adjust this until you get it right.

Re: Mach 3 and 4th Axis
« Reply #51 on: April 04, 2012, 09:44:09 AM »

I am sorry if I confused you. The threads per inch were part of the calculations for the linear motion.

Now as for the rotary axis. I have a little 3 jaw chuck. that is driven by a pulley on the back side. The pulley is driven by the stepper motor that has a smaller pulley attached to its' shaft. They are connected by a timing belt. The large pulley has a 72 stamped on it, so I am assuming it is a 72:1 ratio. The stepper motor has to turn more revolutions to make the chuck turn 1 revolution. This is where I am having the issue determining what the step number is. I hope this makes this more clear for you.
I guess, like you say, I will have to play around with the numbers and measure the angle of rotation until I come up with what the stepper needs to turn. Thanks for all your help.