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rotary axis setup
« on: November 20, 2006, 04:30:10 PM »
I have just added a rotary axis to my set up the A axis. I am now trying to find out how to calibrate it and verify the DRO reading to the table position.

I know the table reduction ratio (worm/wheel) and I can set my micro stepping motor as usual , but how do I know what units the DRO is reading? degrees? Radians? or something totally different?

Advice on the correct setup procedure would be appreciated.

Alan

Offline Chaoticone

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Re: rotary axis setup
« Reply #1 on: November 20, 2006, 04:40:09 PM »
I would think it would be however you set up your steps equals. The DRO is only counting pulses sent. I don't know this for sure but I would like to as I'm planning on a 4th axis eventually. ;D
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Re: rotary axis setup
« Reply #2 on: November 21, 2006, 11:21:47 AM »
Not so sure as the motor tuning page sets steps per .... and that refers to the native units used inches or millimeters. Nowhere can I find any reference to setting steps per revolution.

So my question remains what is the DRO indicating on a rotary axis and how is it set?

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Re: rotary axis setup
« Reply #3 on: November 21, 2006, 11:30:27 AM »
I would think you would set it to what ever you are going to be programing. If I was using mm, I would do the math for that. Degrees, I would do the math for that. ______ steps=1 degree. You just wont put in the word degree. All the DROs are doing are showing pulses sent. What do you want to set it up in? How many steps of the motor will give you this?
« Last Edit: November 21, 2006, 11:34:00 AM by Chaoticone »
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Re: rotary axis setup
« Reply #4 on: November 21, 2006, 11:51:46 AM »
OK, if the steps per box is interpreted as degrees then I just calculate the number of steps required to turn the table one degree and enter that in the steps per box.

Thanks.

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Re: rotary axis setup
« Reply #5 on: November 21, 2006, 12:22:30 PM »
 :)
Keep us posted.
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Offline Chip

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Re: rotary axis setup
« Reply #6 on: November 21, 2006, 03:51:46 PM »
Hi, AlanETM

On my Sherline rotary table it's 144072 step's pre one full turn, divided by 360 = 400.2 per deg.

Velocity 2500 Acceleration 500 the blended speeds, blended and feed's read funny though actual rate seems fine, don't forget to set the A axis dia. in settings page.

Hope this Helps, Chip
Re: rotary axis setup
« Reply #7 on: November 22, 2006, 11:58:10 AM »
Did Mach 3 take the 400.2 steps/ degree or does it only take an interger number?

Not sure yet what the A axis diameter actually does. Is this the stock material diameter or the finished work diameter?

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Re: rotary axis setup
« Reply #8 on: November 22, 2006, 12:11:24 PM »
Quote
Not sure yet what the A axis diameter actually does. Is this the stock material diameter or the finished work diameter?

Where is this at? In Mach or a cam package?
If i neede 400.2 i would try it and see. ;D
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Offline chad

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Re: rotary axis setup
« Reply #9 on: November 22, 2006, 02:00:48 PM »
My understanding that this is the stock diameter. Also you can use 400.*************************** , it doesn't have to be an integer.

Chad