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  1. #11
    Quote Originally Posted by JAZZCNC View Post
    Word of caution with using 48V with drives rated at 50V, esp the DM542 clones which don't tolerate over-voltage well..
    Im with Jazz on this.
    I'd rather get a 48v that's adjustable and drop it to 45v.
    I'd never go back to the 50v drives since using the DM860T.

  2. #12
    Many thanks for the advice, it is appreciated!

    Would I be better off to swap out the old 48v PSU (the only thing still left of the original electronics) for a new 36v one (the cheap option), or upgrade the drivers to somthing like these DM680C (https://www.amazon.co.uk/2-Phase-2-4...2&sr=8-14&th=1) which are 24-100V input with 48-60v Typical then continue to run them at 48v? Upgrading the drivers at 70 quid each is a fair hit on the wallet but if this was the better route it's worthwhile. I'm sure I'll find uses for the current drivers, or I'll stick them on ebay.

    I'm not too worried about slowing the speeds down while I play / learn. I just want it to be vaguely usable to begin with!!
    The steppers are rated at 84V. and are pretty beefy.

    For the moment I'm hoping the current setup will at least allow me to get the thing fully wired up and moving without blowing up. I have the current limits on the drivers set to 1A while i'm testing and will only up this when the machine is electrically complete. To begin with I'll probably start test cutting on MDF or florists foam while I get my head around the CAM software (think of this as training wheels for a CNC!).

    Sorry for the questions...

    1) Would I completely kill the stepper motor performance by lowering the supply voltage to 36V for now and use the existing drivers. Any idea if the stepper would even function?

    2) If I buy new drivers, should I keep the supply at 48v or go higher (60v) or lower (36v). What are the pro' and cons?

    Many Thanks

    Peter
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  3. #13
    Thought I'd post a couple of pics vids about adapting the Surecraft to accept a 500w Air cooled spindle. I had to 'mill' a block of Aluminium - without a mill. I managed to cut it with a metal blade in my table saw (very sketchy!) then alot of sanding, drilling and tapping!

    Overall I'm really happy with the result, it fits well and is a rock solid mount for the spindle.

    Here's a couple of videos, one of me fitting it and the other of the final result.

    https://youtu.be/tPd3wVfMgm4

    https://youtu.be/iGXIuixW1jU

    Hope you enjoy
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  4. #14
    I can't say how those particular motors will behave at 36V, but I'm using DM452 drivers with 36V switch mode supplies to drive 3NM NEMA 23 motors with no difficulty. My gantry is way heavier than yours, has a 2.2kW spindle riding on it but it will rapid at over 10m/min and acceleration is fine for me.

    Your 48V supplies may well be adjustable, look for a small trimmer near the terminals, so you might be able to reduce he voltage to somewhere near 45V to give the driver a bit more headroom.
    An optimist says the glass is half full, a pessimist says the glass is half empty, an engineer says you're using the wrong sized glass.

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