forum.cncdrive.com

I'm currently bringing back to life a non-functional Suregrave engraver by installing an AXBB-E, new drivers and pwm controller for the brushed spindle motor. So far I've got my head round most of the potential problems but as I haven't yet received my controller (should be delivered tomorrow) I'm still very much in the planning phase. No doubt I'll have other questions but here's the first one I haven't managed to find an answer to yet.

The original engraver is fitted with a good quality power supply, big toroidal transformer, rectification, smoothing, and regulating pcb and as I also want to use the original case I'd like to use this supply. The psu produces 5.0V, 36V (for the steppers) and what I had originally assumed would be 24V for the spindle, as that's what it is rated at. My thinking was that I could also use the 24V to supply the AXBB but I've measured the actual voltage and it's 25.3V. The AXBB manual specifies 12V to 24V, is the 25.3V likely to be too high? It's not a serious problem, I've also got a separate 24V supply but that means adding another box inside the case and it may get crowded in there, which I'd rather avoid.

Anyone able to offer any advice?

use a seperate power supply.

25.3 Volts is no problem.

Thanks very much for that reply! What has happened in the meantime is that I've been given a bigger case to fit all the electronics into so I've installed a separate 24V power supply. I'm now using the 25.3V supply on the original board to provide power for the spindle and the original board also supplies 5V for the AXBB and 36V for the steppers. The bigger case is making putting this togather much easier so I'm glad I've gone with that.

That would probably be best to prevent and noise from the spindle affecting other things