Motor/Driver Compatibility

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ctwo
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Motor/Driver Compatibility

Post by ctwo »

I'm just thinking of setting up a single axis CNC rotary table, 8". Mostly just to cut gears. I was considering a worm gear drive with driving the worm direct from a stepper, something like a 4" worm wheel just behind the handle.

I'm wondering for this application, if I should be looking for a larger motor?

And if this motor and driver would work together? I might want to use it for something else if they are compatible.

http://www.ebay.com/itm/CNC-Router-Nema ... 3384a41f5a

http://www.ebay.com/itm/CNC-Router-Sing ... 7673035%26
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ctwo
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Re: Motor/Driver Compatibility

Post by ctwo »

I went with something else just to make it, easier?

http://www.ebay.com/itm/Free-to-USA-CA- ... OC:US:3160
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Marty_Escarcega
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Re: Motor/Driver Compatibility

Post by Marty_Escarcega »

Here is a self contained Rotary Table Indexer build on CNCZONE:
http://www.cnczone.com/forums/open_sour ... er-62.html
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Re: Motor/Driver Compatibility

Post by ctwo »

Lots to read there, Marty.

I read that a G251 driver would be ideal, but the one I ordered is also good, so that is comforting. I think there is somewhat a deficiency on the motor, though not yet sure.

Here is an interesting bit: "...if the MotorSteps x DriverSteps x WormRatio is greater than 65535 then it won't work."

Now I had not considered it and don't fully understand the issue.

200 * 128 * 90 = 2.3 million?
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ctwo
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Re: Motor/Driver Compatibility

Post by ctwo »

Just a note to myself, the 65535 limit is due to 16-bit variable in the controller provided by the designer of that build.
Standards are so important that everyone must have their own...
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ctwo
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Re: Motor/Driver Compatibility

Post by ctwo »

baby stepper motors in. These might be used for a telescope drive, that was the concept anyway, but the stepper might not be a good solution due to the clicks...

These are 1/4 steps, quick and dirty just to see it spin. My first motor...



http://www.youtube.com/watch?v=eER-duWn1DU
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ctwo
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Re: Motor/Driver Compatibility

Post by ctwo »

I got the larger motor in. Longer than I was expecting, but it should work.

What the heck, I was still having fun with the babies...



http://www.youtube.com/watch?v=kX_DwDbvIlE
Standards are so important that everyone must have their own...
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Marty_Escarcega
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Re: Motor/Driver Compatibility

Post by Marty_Escarcega »

ctwo wrote:I got the larger motor in. Longer than I was expecting, but it should work.

What the heck, I was still having fun with the babies...

Cute, I wanted to see the plastic clothes pin go flying! :-) What are you controlling them with?
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Re: Motor/Driver Compatibility

Post by ctwo »

It is an AVR 328p chip (Arduino) and A4988 based driver modules.

I programmed a simple pulse cycle to increment at various rates to a max of ~500 kHz. (and yeah, the clip did fly off a few times, amazing that they stay on as well as they do...)

I think in the thread you referenced above, someone from your team ported the PIC code there to a newer chip. So now I'm contemplating just using that solution for the controller vs making my own. I can program either using AVR studio or the Arduino IDE (which I'm more familiar with) or using a PICKit2 with MPLAB, but I'm not a heavy programmer.

I was also inspired by the work of Chuck Fellows and am now considering whether I want to convert my manual Rotary Table or just make my own dividing head. There are benefits and drawbacks either way.
Standards are so important that everyone must have their own...
To measure is to know - Lord Kelvin
Disclaimer: I'm just a guy with a few machines...
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