TOS-KURIM CNC Upgrade

[JimJam]

Nope didn't see that one, thank you! I'll give that a go today.

I spent a couple of hours trying to look into understanding it and how it all works but it went straight over my head!

Had another strange issues yesterday.. when I connect the 5V DC power to all three drive units none of them work, but when I unplug one of them the other two work. it doesn't matter which one I unplug the others will then fire up. power supply issues? I am only using one unit to feed the three drives and the controller board....

I have got a 12V DC unit somewhere which I'm pretty sure can be used for the drive units, might give that a go see if that makes a difference.

[Muzzer]

Yes, sounds as if the 5V supply can't supply enough current to get more than 2 of them started up. There may be an inrush current surge at turn-on that is upsetting the PSU. As you say, feeding 12V into pin 7 is an alternative. It may also be safer if there's an internal regulator in each of the drives to drop it to 5V by the sounds of it. Pretty sure that's what I did for my 3 drives.