Not an issue, a question.

[charleslowry]

Using the RAMBo with a Rostock Max and it's fantastic. Loving it.

I want to build a one-off cnc router using the RAMBo board and nema 23 motors. Can the new RAMBo v1.1b handle these motors?

Thanks!

[johnnyr]

Sorry for the slow reply. I missed this issue.

You can drive some nema 23 motors from RAMBo. It depends on the specifications for the motor. You are limited to 2A (24V)by the RAMBo board, and many nema 23 motors can be driven by that.

[charleslowry]

Thank you very much for replying!Charles.
On 2/25/2013 5:46 PM, johnnyr wrote:

  Sorry for the slow reply. I missed this issue.
  You can drive some nema 23 motors from RAMBo. It depends on the
    specifications for the motor. You are limited to 2A (24V)by the
    RAMBo board, and many nema 23 motors can be driven by that.
  —
    Reply to this email directly or view
      it on GitHub.

[mrbi11]

Did you get Nema23 working with Rambo? Can you share your settings for motor current, timing, micro-stepping, and such?

[charleslowry]

I never tried it with the Rambo board, but I did get
  them to run using the Rumba board.  I think I can give you a touch
  of advice which may be of use to you.
  While I did get the nema 21 to work, I was not entirely satisfied
  with the performance.  Although there was more torque I felt there
  was still a lot left on the table when using the on-board
  drivers.  When I upped the voltage so I could increase the power,
  I blew the driver, and the
    driver was the upgraded POLOU DRV8825 High Current version which
    is better than the driver on the Rambo board. Fortunately
  I was using the Rumba board where you can replace the drivers. 
  This POLOU
    driver can run upwards of 1.5 Amps per phase
  whereas the driver on the Rambo board tops out below 1 amp.  
  So to recap so far, I ended up using the Rumba board because I
  could upgrade the drivers and replace blown drivers if needed,
  which is what happened.  I did get the nema 23 to work but it's
  performance was sub par because I could not increase the motor
  current beyond what the drivers could handle.  This means that the
  Nema 23's were effectively using the same power as the Nema 17's. 
  So not much gained.
  In retrospect, this is what I would have done and this is what I
  would recommend.
  Go ahead and use the Rambo board but DO NOT DRIVE THE NEMA 23
  DIRECTLY FROM THE BOARD.
  Instead, run the output of the stepper drivers to a driver
  specifically designed to work with the Nema 23's.  Since the
  limiting factor in all this is the current and voltage
  capabilities of the drivers, you need to upgrade the drivers
  beyond what is available to you with either the Rambo or Rumba
  boards.
  Therefore should I do this again I would run the output of the Rambo
  board into a driver like this one.CNC
    2M542 Stepper Motor Driver Controller 4.2A Switch 24-50V 2phase
    Nema17/23/34
  Or go with a complete kit like this one.LOWEST
    PRICE 4Axis Nema23 Stepper Motor 425oz-in Single &Driver
    4.2ACNCMill
  You could do even better on pricing by emailing the supplier for a
  3 motor kit.
  There you go!
  Charles.
On 7/18/2014 5:11 PM, mrbi11 wrote:

  Did you get Nema23 working with Rambo? Can you share your
    settings for motor current, timing, micro-stepping, and such?
  —
    Reply to this email directly or view
      it on GitHub.

[mrbi11]

Many thanks for the thoughtful response.

The links was lost in my email, were they by chance on ebay?

peace, *Bill Kelley

• 512 266 1896

On 7/19/2014 11:49 AM, charleslowry wrote:

I never tried it with the Rambo board, but I did get them to run using the Rumba board. I think I can give you a touch of advice which may be of use to you. While I did get the nema 21 to work, I was not entirely satisfied with the performance. Although there was more torque I felt there was still a lot left on the table when using the on-board drivers. When I upped the voltage so I could increase the power, I blew the driver, and the driver was the upgraded POLOU DRV8825 High Current version which is better than the driver on the Rambo board. Fortunately I was using the Rumba board where you can replace the drivers. This POLOU driver can run upwards of 1.5 Amps per phase whereas the driver on the Rambo board tops out below 1 amp. So to recap so far, I ended up using the Rumba board because I could upgrade the drivers and replace blown drivers if needed, which is what happened. I did get the nema 23 to work but it's performance was sub par because I could not increase the motor current beyond what the drivers could handle. This means that the Nema 23's were effectively using the same power as the Nema 17's. So not much gained. In retrospect, this is what I would have done and this is what I would recommend. Go ahead and use the Rambo board but DO NOT DRIVE THE NEMA 23 DIRECTLY FROM THE BOARD. Instead, run the output of the stepper drivers to a driver specifically designed to work with the Nema 23's. Since the limiting factor in all this is the current and voltage capabilities of the drivers, you need to upgrade the drivers beyond what is available to you with either the Rambo or Rumba boards. Therefore should I do this again I would run the output of the Rambo board into a driver like this one.CNC 2M542 Stepper Motor Driver Controller 4.2A Switch 24-50V 2phase Nema17/23/34 Or go with a complete kit like this one.LOWEST PRICE 4Axis Nema23 Stepper Motor 425oz-in Single &Driver 4.2ACNCMill You could do even better on pricing by emailing the supplier for a 3 motor kit. There you go! Charles. On 7/18/2014 5:11 PM, mrbi11 wrote:

Did you get Nema23 working with Rambo? Can you share your

settings for motor current, timing, micro-stepping, and such?

Reply to this email directly or view it on GitHub.

---

Reply to this email directly or view it on GitHub https://github.com/ultimachine/RAMBo/issues/3#issuecomment-49514558.

[charleslowry]

Yes, they are.  You can copy and paste:
2M542 Stepper Motor Driver Controller
straight into the search and find it right away.
Good luck!
Charles.On 7/19/2014 1:38 PM, mrbi11 wrote:
Many thanks for the thoughtful response.
  The links was lost in my email, were they by chance on ebay?
  peace,
  *Bill Kelley
  * 512 266 1896
  On 7/19/2014 11:49 AM, charleslowry wrote:
  >
  > I never tried it with the Rambo board, but I did get
  > them to run using the Rumba board. I think I can give you a
  touch
  > of advice which may be of use to you.
  > While I did get the nema 21 to work, I was not entirely
  satisfied
  > with the performance. Although there was more torque I felt
  there
  > was still a lot left on the table when using the on-board
  > drivers. When I upped the voltage so I could increase the
  power,
  > I blew the driver, and the
  > driver was the upgraded POLOU DRV8825 High Current version
  which
  > is better than the driver on the Rambo board. Fortunately
  > I was using the Rumba board where you can replace the
  drivers.
  > This POLOU
  > driver can run upwards of 1.5 Amps per phase
  > whereas the driver on the Rambo board tops out below 1 amp.
  > So to recap so far, I ended up using the Rumba board because
  I
  > could upgrade the drivers and replace blown drivers if
  needed,
  > which is what happened. I did get the nema 23 to work but
  it's
  > performance was sub par because I could not increase the
  motor
  > current beyond what the drivers could handle. This means that
  the
  > Nema 23's were effectively using the same power as the Nema
  17's.
  > So not much gained.
  > In retrospect, this is what I would have done and this is
  what I
  > would recommend.
  > Go ahead and use the Rambo board but DO NOT DRIVE THE NEMA 23
  > DIRECTLY FROM THE BOARD.
  > Instead, run the output of the stepper drivers to a driver
  > specifically designed to work with the Nema 23's. Since the
  > limiting factor in all this is the current and voltage
  > capabilities of the drivers, you need to upgrade the drivers
  > beyond what is available to you with either the Rambo or
  Rumba
  > boards.
  > Therefore should I do this again I would run the output of
  the Rambo
  > board into a driver like this one.CNC
  > 2M542 Stepper Motor Driver Controller 4.2A Switch 24-50V
  2phase
  > Nema17/23/34
  > Or go with a complete kit like this one.LOWEST
  > PRICE 4Axis Nema23 Stepper Motor 425oz-in Single &Driver
  > 4.2ACNCMill
  > You could do even better on pricing by emailing the supplier
  for a
  > 3 motor kit.
  > There you go!
  > Charles.
  > On 7/18/2014 5:11 PM, mrbi11 wrote:
  >
  > Did you get Nema23 working with Rambo? Can you share your
  > settings for motor current, timing, micro-stepping, and such?
  > ---
  > Reply to this email directly or view
  > it on GitHub.
  >
  > ---
  > Reply to this email directly or view it on GitHub 
  >

https://github.com/ultimachine/RAMBo/issues/3#issuecomment-49514558.

— Reply to this email directly or view it on GitHub.