48 VDC Power Supply and DC Motor Drive

Dyna Myte DM2800 Restoration Part #005

This week I verified the voltage coming out of the stepper power supply then went on to hook the G251x stepper drive power wires up. Also added the current programming resistors and dove deep into the theory of operation on the rest of the electrical panel.

I’m calling out for any info that can be found on the electro-craft brushless spindle drive. The only markings on it are AW0016-6423 Rev B. If you have anything it would be most appreciated.

18 thoughts on “Dyna Myte DM2800 Restoration Part #005”

  1. I’ve been in the process of rebuilding a DM3000-E lathe that I got last fall, and it has the same motor and amplifier… it’s an Electro-Craft BRU-50, but the amp isn’t complete. It looks like they removed the control board for positioning, since it only needs to spin. The I/O pins on the full amp normally go into that board, so the pinout in the manual doesn’t help, and I have yet to find a complete schematic of the amp. I pulled all of that out, though, and am using a 2.5hp brushed DC motor from a treadmill with an AMC analog amp (with tachometer feedback), but am, at some point, going to take a stab at figuring out which pin is which, since that 1hp motor is perfect for a tool post grinder I built.

    1. Yes, those are the same problems I ran into. I put about 6 months into figuring it all out then finally caved in and took it out. Of course, several months later I’m still fooling around with the servo replacement motor. If you have any luck let me know!

  2. Hi Pete,

    Nice work on the dm2800 conversion! I subscribed to your YouTube channel last night. Do you have any spare parts including the old spindle motor that you would like to sell?

  3. Do you know of anyone that has successfully done a retrofit using the ac servos that were used on later dyna mechtronics machines?

    I just got a dm4400m with Mitsubishi controls and ac servos. I’m not completely opposed to replacing motors but would reuse these if I could find recent drivers for them.

    Thank you

    1. Hi Duke,
      No, I don’t. The only place I know of where you may find somebody is over on the CNC Zone forums. I’ve never seen one of those larger machines in person, just pictures on the internet. Sorry I can’t be of help


  4. Did you ever finish making the servo mount out of aluminum of steel? If so would you be willing to sell one? I have a 2800 and the last thing I need is to upgrade the spindle drive .yours looks great! Thanks for any information. Robert Hepler

    1. Thanks so much! I never did. It turned out that the 3D printed part was strong enough for the job and it has been there ever since.

      1. How about the cad file?? So I could get made? By the way on the carnival ride video what was the paint remover you used it seemed to work great! I do welding repair on tractors getting the paint off before I sand blastwould save time. thanks Robert

        1. I can probably provide it as a step file or some other 3D type of cad file if that would work. I use CitriStrip for paint removal.

          1. Are you interested In 3d printing me the same one you made and a copy of the file so I could do what you wanted to do originally? just send me a price and I can get you some money going your way if not than let me know the amount for the file .thanks for the paint stripper name I couldn’t make it out in the video.if you would like to try a better degreaser try a product called oil eater you can get I at oreily auto you will love it thanks. Robert Hepler

  5. Just saw the video on the ford van how abot a 4×4 conversion check out ujoint offroad and see if they would work with you? Yor back in cold country try getting rid of the glow plug controller and do a solenoid push button control it really helps to manually control it in really cold winters. Ps that 7.3 is the best motor ford ever made have fun with it. Robert Hepler

  6. Robert Hepler. Honkerwho@aol.com. way back in the 70s had a friend who’s dad had a chrome shop and they had a spray coating for plastic parts that would allow chrome to plate to it.. so it still might be available ?? Did you consider the idea of printing me a mount? Thanks for your videos

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