3 Axis CNC router

**JoeHarris** · 12-10-2016

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Attached is my first crack at a circuit diagram for the machine. I am not sure that I have got the pilz right and I think the estop circuit in general could do with some work as the spindle is not currently part of it. Do I connect to the same contractor I have for the stepper drive power supplies or another? I have a couple of relays left on the pilz X1 if I need them... Also, I'm sure I have read that you shouldn't just cut power to the VFD...?

I'll continue to work on it (and research) but thought I'd put it up for your amusement! As always any comment gratefully received

(Just realised that the resolution reduces when you upload. I will try and sort out the text sizes as they are pretty fuzzy in places)

**Clive S** · 12-10-2016

Joe The text is a bit small to read. You are showing a 68V power supply does this also provide the 12V to the fans

**JAZZCNC** · 12-10-2016

Not very easy to read labels but I suspect your using the HV option on controller to turn on contactor.?
Don't use it my self because it's pain in arse.? It will drop the power to drives every time you put mach into reset. This means because the motors jump when powering drives you'll have to home the machine everytime mach goes into reset. Many times that will be ok but there are others when you don't want that. Like when making simple setting change etc.
I'd just have the E-stop safety relay switch contactor on.

Couple of small things I see.

#1 Fuse the Water pump.
#2 Run water pump 0V thru VFD relay so only comes on when spindle running.

Regards VFD power then wouldn't get too OCD about it.! The controller will Stop it spinning when see's E-stop so could leave it out of the E-stop system if you like.
But if you do want to Kill it then use Timer relay which is set to drop power after spindle stops spinning. Personaly I wouldn't bother because the few times you will Kill power while spindle is spinning won't hurt the VFD. Plus the VFD takes several sec's to power down anyway because of Caps. By which time spindle will have stopped.! . . . . . Anyway If Cutter is embedded in your hand you won't really care because you'll passout before VFD powers down.

**JoeHarris** · 12-10-2016

The human toolpath is pretty smooth despite appearances - characterful!!

**JoeHarris** · 12-10-2016

Vibration white finger here I come!

**njhussey** · 13-10-2016

Coming along nicely...love shiney machined aluminium pictures 😁

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**Wobblycogs** · 13-10-2016

Looks great, how long did it take to mill / rout out?

**JoeHarris** · 13-10-2016

Originally Posted by Wobblycogs

Looks great, how long did it take to mill / rout out?

Not as long as I thought - half an hour or so. I took 1/2mm per pass which was more aggressive than the last time but was fine. So 32 passes with a 10mm carbide end mill.

**Wobblycogs** · 13-10-2016

Yeah, 0.5mm is about what I've taken when I've tried routing aluminium, quite honestly though it scares me but my fence set up wasn't as good as yours. It's not too bad if you've got a decent spray of WD40 on it but I couldn't get past the feeling that it was going to catch and rip the router out of my hands.

**JoeHarris** · 13-10-2016

Originally Posted by Wobblycogs

Yeah, 0.5mm is about what I've taken when I've tried routing aluminium, quite honestly though it scares me but my fence set up wasn't as good as yours. It's not too bad if you've got a decent spray of WD40 on it but I couldn't get past the feeling that it was going to catch and rip the router out of my hands.

I know what you mean, I wouldn't want to do it with a smaller router. A cheap 1/4 inch would be terrifying!