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### Author Topic: 4th Axis calculate steps ?  (Read 3957 times)

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#### Vortex

• 26
##### 4th Axis calculate steps ?
« 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

#### Chaoticone

• 5,626
• Precision Chaos
##### Re: 4th Axis calculate steps ?
« Reply #1 on: February 09, 2013, 04:03:45 PM »
If you could see the things I have in my head, you would be laughing too.

My guard dog is not what you need to worry about!

#### Hood

• 25,835
• Carnoustie, Scotland
##### Re: 4th Axis calculate steps ?
« Reply #2 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

#### Vortex

• 26
##### Re: 4th Axis calculate steps ?
« Reply #3 on: February 10, 2013, 03:53:49 AM »
Hello Brett..Hello Hood.

Ok letÂ´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

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

#### Hood

• 25,835
• Carnoustie, Scotland
##### Re: 4th Axis calculate steps ?
« Reply #4 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

#### Vortex

• 26
##### Re: 4th Axis calculate steps ?
« Reply #5 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

#### Hood

• 25,835
• Carnoustie, Scotland
##### Re: 4th Axis calculate steps ?
« Reply #6 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

#### Vortex

• 26
##### Re: 4th Axis calculate steps ?
« Reply #7 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....

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

regards