Acord Board DC Motor Support

[wbhall38]

Greetings,

Just purchased the Acorn board trying to retrofit an old CNC router that has 24V DC servo motors will the acorn board support these motors with the correct driver.

Best Regards,

Walter Hall

[martyscncgarage]

Greetings,

Just purchased the Acorn board trying to retrofit an old CNC router that has 24V DC servo motors will the acorn board support these motors with the correct driver.

Best Regards,

Walter Hall

Hi Walter,
Welcome to the group.
Please take the time to follow this post: viewtopic.php?f=60&t=1043
Include pictures of the labels on the motors. Pictures and specs on the machine, what spindle motor and spindle drive you are using etc.
We need to know more about what you are working with.

Marty

[cncsnw]

Yes, it will, "with the correct driver". The correct driver being one that will power a DC servo motor, read its encoder, close the position loop, and respond to step-and-direction position commands.

[wbhall38]

Greetings,

thanks guys for the quick response I attached picture of the servo and spindle motor tags along with pictures of the machine. I have not selected a driver for these motors as of yet looking for feed back or suggestions from you guys.

Thanks,

Walter Hall

[martyscncgarage]

I hope Marc or Tom can chime in on this one. I am unfamiliar with those Italian made motors. I think I read they are 6.5A at about 176VDC.
So, All in One DC would be a better choice. Though I would like concurrence.
If you REALLY want to try and drive those DC brush servos with Step and Direction drives, these may work:
https://www.cnc4pc.com/dg4s-16035-dc-servo-drive.html

Be aware you do have to tune the drives to the motors. You will likely have to refit all of them with encoders.

Otherwise, if I wanted to go Acorn on a machine of that size, I would change over to AC Drives that take step and direction and AC Servo motors.

This is why I asked for pictures of the machine and the motors. Its a large format machine.

What spindle drive does it have now?

[tblough]

I'd add encoders to the motors and run them with an AllIn1DC. Since they are 176VDC, you can just use rectified 120VAC without a transformer.

[Muzzer]

But yes, as this is the Acorn forum, the DG4S brushed servo drives would seem to be an option. I have used these on my SEM motors with good success. You need encoders but not the tachos. This has the advantage that you don't need to play with the motor mounts, pulleys, belts etc.

[dustboy]

I tried to retrofit my Masterwood Speedy (also Italian, circa 1999) which had brushed DC servos. Used Machdrives which are very nicely designed but under-rated powerwise (20A) for your motors. Tuning DC servos seems to be a bit of a dark art. Never got them to run smoothly, in spite of some good support from Machdrive. After many hours of trying to tune mine, I gave up and switched my plan to Clearpath servos which are self-tuning.

To run the DC drives you must be able to mount an encoder directly to the motor shaft, if it doesn’t already have one.