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Mach Discussion => General Mach Discussion => Topic started by: Vortex on February 09, 2013, 12:09:18 PM

Title: 4th Axis calculate steps ?
Post by: Vortex on February 09, 2013, 12:09:18 PM

Hello together.

Can someone help me?  I purchased a 4th axis for my mill. Now I have to set the steps in Motortuning.

I got a ratio 1/8 because I have two pulleys on it. One with 12 teeth on the Stepmotor and one on the spindle with 72 teeth.

How do I calculate the steps ??

Thank You

Regards

Title: Re: 4th Axis calculate steps ?
Post by: Chaoticone on February 09, 2013, 04:03:45 PM

http://www.machsupport.com/forum/index.php/topic,12512.0.html#new

http://www.machsupport.com/forum/index.php/topic,16315.0.html#new

Is that what you need?
Brett

Title: Re: 4th Axis calculate steps ?
Post by: Hood on February 09, 2013, 05:19:16 PM

you have 1/6 ratio if its 12 and 72 pulleys, you also need to know if its a 1.8 degree  stepper you have and also what the microstepping is set to, maybe that is what you were meaning by the 1/8?

Hood

Title: Re: 4th Axis calculate steps ?
Post by: Vortex on February 10, 2013, 03:53:49 AM

Hello Brett..Hello Hood.

Ok let´s start again ...the values I posted are not correct. I was going by description of the 4.th Axis. But the pulleys are different.

Ok Restart. One pulley got 17 teeth and the pulley on the spindle got 127 teeth. I counted by myself this morning  ;D

OK my calculation was this diameter of the big pulley 82,19mm dia from the small pulley 11,00

If my calculation is correct , we got a ratio of 7.47 . Is this right ?
Now  200*8*7,47 /360=33,2

Is this correct ? 

Now my question is , The value of 33,2, is this the value to set in the A-Axis Motortuning as Steps ????  But this are degrees or not and in the Stepsfolder Mach requires mm ...or not?


Thank you

Regards

Title: Re: 4th Axis calculate steps ?
Post by: Hood on February 10, 2013, 04:12:24 AM

You dont need bother working out the diameter of the pulley as all you need to do is divide the teeth on big by teeth on small, much easier :)

Ok your calcs are correct and yes it is degrees in motor tuning if you have the axis set as a rotational. It says Steps per unit and in this case a Unit is degrees.
Hood

Title: Re: 4th Axis calculate steps ?
Post by: Vortex on February 10, 2013, 05:19:04 AM

Hello Hood,

Ok thank you for the tip.

Tell me , how can I set the Axis as rotational ???

Gio

Title: Re: 4th Axis calculate steps ?
Post by: Hood on February 10, 2013, 05:30:07 AM

It is likely set that way as that is default but its on General Config page on the left hand side.
Hood

Title: Re: 4th Axis calculate steps ?
Post by: Vortex on February 12, 2013, 05:33:18 AM

Hello Hood ,

Ok Thank you.  I will try this as soon as I got the cable fixed to the controler.... ;D

I got an other question to you...I will write you in PM

regards