Fingers crossed it'll cut ally

**Jonathan** · 22-11-2010

I would put a separate fuse on each power supply. Whatever is standard for the computer (3A?), and probably similar for the power supplies. Bear in mind the surge current when you switch it on will be quite high. In my case switching on the stepper motors briefly dims the light in my workshop.

Oops, just realised you're talking about a switch not a fuse

Nevermind I'll leave this here.

I'm liking where you've chosen to mount the electrics.

**blackburn mark** · 22-11-2010

dims the light in my workshop

youve got heafty setup compared with mine

should i also run an earth to my frame, the power supplies are bolted to the frame but iv no idea how conductive the surface of anodised aluminium is ?

**Jonathan** · 22-11-2010

I thought our drivers were the same? I've got 4 PM752 drivers on a 500VA (I think) toroidal transformer. Maybe it's the big capacitors that cause it...

I think the surface should be conductive enough for an earth. Whether it's a good idea or not I'm not sure. I'd be inclined to say yes.

Good point about the dust. Any fans in there are going to blow in a lot of dust. I found about a 5mm layer of wood dust (and some metal swarf!) in my computer when I cleaned it out on Friday. Probably should have made sure the case side didn't keep falling off, but still...

Edit: didn't see your last post in time :(