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Using Duet controller for CNC ?

lolocaledo

Using Duet controller for CNC ?
November 08, 2015 08:54PM

Registered: 8 years ago
Posts: 155

Hi all,

Is it possible to use Duet controller for CNC ?
Generally, the endstops aren't used on CNC and we have to define "zero" home manually when the piece of metal is in place.
Can we use G92 X0 Y0 Z0 as equivalent ?
Is it the same G-CODE ?

Thanks
Laurent

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dc42

Re: Using Duet controller for CNC ?
November 09, 2015 03:02AM

Registered: 10 years ago
Posts: 14,672

Yes you can use G92 to define the current position of the head reference point instead of using homing switches.

For CNC use you will need larger motors than Nema 17. You should be able to drive Nema 23 motors from a Duet if you choose motors with a current rating of about 1.5A and a 24V supply. Or you can use external drivers connected to the expansion connector and remap the axis drives to them using the M569 command.

Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

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lolocaledo

Re: Using Duet controller for CNC ?
November 09, 2015 06:36AM

Registered: 8 years ago
Posts: 155

Hello,

I'm planing to use 3 NEM23 step motor.
About driver, I've ordered the MKS TB6600 external drivers
it's 12-40VDC and up to 4.5A

Where is documented M569 command ?

Have a nice day
Laurent

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dc42

Re: Using Duet controller for CNC ?
November 09, 2015 06:53AM

Registered: 10 years ago
Posts: 14,672

Quote
lolocaledo
Where is documented M569 command ?

[reprap.org]

You might have to patch the firmware to increase the step pulse width, because the opto isolators on those drivers may not be able to pass the short 1us pulses generated as standard.

Edited 1 time(s). Last edit at 11/09/2015 07:00AM by dc42.

Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

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lolocaledo

Re: Using Duet controller for CNC ?
November 09, 2015 08:10AM

Registered: 8 years ago
Posts: 155

DC42, do you mean that I have to modify the source code ?? Ouch !! :-)

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dc42

Re: Using Duet controller for CNC ?
November 09, 2015 12:49PM

Registered: 10 years ago
Posts: 14,672

Quote
lolocaledo
DC42, do you mean that I have to modify the source code ?? Ouch !! :-)

As you are a good customer, I'll do it for you if/when you find it necessary.

Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

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lolocaledo

Re: Using Duet controller for CNC ?
November 09, 2015 03:20PM

Registered: 8 years ago
Posts: 155

Thank you very much David.
I'll keep you in touch if I meet some problems with these controllers.

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FatFreddie

Re: Using Duet controller for CNC ?
November 10, 2015 12:59PM

Registered: 9 years ago
Posts: 34

In the reprap.org G code wiki it shows no support for G2 / G3 (arc move) which might be a problem depending on how you intend to generate your G code.