One axis, dual steppers

[Luis Fraguada]

Hello,
I am building a bot that has dual y axis steppers.  I do not necessarily need the extruder driver E, could I set it up through firmware to have the E be a slave to the y driver?  Of course, this additional y stepper would need to go in the reverse direction to the original y stepper as they are mirrored.  The steppers I am using are:

• Nema 17
  
• 4.4 Kg.cm
• 1.68 A (each phase)
• 2.8 V
• 2.8 mH

Any hints to getting this working would be very appreciated

[Francisco Mendes]

Hi Luis,

On Sun, Jul 21, 2013 at 5:29 PM, Luis Fraguada <frag...@gmail.com> wrote:

Hello,
I am building a bot that has dual y axis steppers.  I do not necessarily need the extruder driver E, could I set it up through firmware to have the E be a slave to the y driver?  Of course, this additional y stepper would need to go in the reverse direction to the original y stepper as they are mirrored. 

I don't understand the application. Can you explain better?

If this 2 motors work together, you can connect them in series. 

The stepper motor have 2 coils(A and B). Connect in series de coil A from one motor with coil B of other. 

This way the steppers will move synchronized in opposite direction. 

Francisco Mendes

bitBOX team

[Luis Fraguada]

Hello Francisco,
Thank you for the response.  I was thinking of doing them in series, but is it not better to connect them to two different drivers?  I have two motors on y, one motor on x, and one motor on z. 
As you mention, we could run two motors off of the y driver in series.  Another option I was thinking is to use the E driver (I do not need to extrude with this and for my application will be left empty).  So my question was if it was possible to set up the E driver to be a slave of the Y driver?

Best,
Luis

[Luis Fraguada]

Are you referring to this image?  I am doing this, but the motors are moving in the opposite directions...

[Luis Fraguada]

I am doing something similar to this, but the USB connection keeps dropping out after a few jogs of 5mm in y.  They are indeed going in the same direction though...

[Francisco Mendes]

On Thu, Jul 25, 2013 at 7:27 AM, Luis Fraguada <frag...@gmail.com> wrote:

Hello Francisco,
Thank you for the response.  I was thinking of doing them in series, but is it not better to connect them to two different drivers? 

No.
If you want them to work synchronized the series connection is the best solution. Simpler to implement. Depend only on wiring.

I have two motors on y, one motor on x, and one motor on z. 
As you mention, we could run two motors off of the y driver in series.  Another option I was thinking is to use the E driver (I do not need to extrude with this and for my application will be left empty).  So my question was if it was possible to set up the E driver to be a slave of the Y driver?

If you configure E axis with same parameters has Y axis on config.txt (configuration file resident on uSD card), you can send G code for both axis like this:

G1 Yxx Exx

Config.txt

steps_per_mm_e = x

steps_per_mm_x = x

Regards,

Francisco Mendes

bitBOX team

Best,
Luis

On Thursday, July 25, 2013 4:05:32 AM UTC+2, FMendes wrote:

Hi Luis,

On Sun, Jul 21, 2013 at 5:29 PM, Luis Fraguada <frag...@gmail.com> wrote:

Hello,
I am building a bot that has dual y axis steppers.  I do not necessarily need the extruder driver E, could I set it up through firmware to have the E be a slave to the y driver?  Of course, this additional y stepper would need to go in the reverse direction to the original y stepper as they are mirrored. 

I don't understand the application. Can you explain better?

If this 2 motors work together, you can connect them in series. 

The stepper motor have 2 coils(A and B). Connect in series de coil A from one motor with coil B of other. 

This way the steppers will move synchronized in opposite direction. 

Francisco Mendes

bitBOX team

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[Luis Fraguada]

Hello Francisco,
I ended up wiring them in series.  Things are moving quite nicely.  Thanks!
Luis

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[Francisco Mendes]

I'm glad I could help.

I would like to know more about your project and how useful was the R2C2. Send some pictures or youtube videos if possible.

Regards,

Francisco Mendes 

    

+351 919 976 747

fme...@bitbox.pt

www.bitbox.pt

IEUA - Universidade de Aveiro

Portugal

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[Luis Fraguada]

Francisco,
Project is now moving (very beautifully I might add!), but there are some other things to do...I will ask in another thread. For a bit of info, I am driving a shapeoko with the system.

Thanks!
Luis

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