Build Log: 4'x4' Moving Gantry CNC Router

[GeorgeW21]

Hi george!
Just a quick question. Are you planning on using 5v psu for the drivers?
This seems very low...?
Regards
Madman

Hi madman,

5v is to power the breakout board.
24v for estop circuit
36v for the drivers and steppers

The 5v into the drivers is the pulse and direction signals (plus I think I need to add in the enable signal too).

Regards
George

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[routercnc]

Hi George,

I wouldn't use the e-stop system to kill the mains power to the VFD, at least not immediately like that. I don't think they like being turned off while the spindle spools down. Instead install a 3 second (say) delay circuit, or leave it connected normally and use the run/stop signal terminals on the VFD control panel to turn it off.

[GeorgeW21]

Hi George,

I wouldn't use the e-stop system to kill the mains power to the VFD, at least not immediately like that. I don't think they like being turned off while the spindle spools down. Instead install a 3 second (say) delay circuit, or leave it connected normally and use the run/stop signal terminals on the VFD control panel to turn it off.

Hi mate,

Thanks for the tip. That output on the pnoz is on a delay. Variable from around 5s to a minute iirc.

Regards
George

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[routercnc]

Hi mate,

Thanks for the tip. That output on the pnoz is on a delay. Variable from around 5s to a minute iirc.

Regards
George

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Apologies George skimmed the dwg quickly. In that case no problem. Those pnoz units are pricey but have nice features.

[GeorgeW21]

Apologies George skimmed the dwg quickly. In that case no problem. Those pnoz units are pricey but have nice features.

Yeah I know, I was pretty shocked when I looked online and saw the retail price . Not having used anything like that before I was a bit worried I wouldn't be able to figure it out, but after a few hours of head scratching with the data sheet I managed to get it figured out. Cheers for taking the time to look over the wiring. Much appreciated.

Regards
George

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[Neale]

My first reaction is that 36V is a bit on the low side for a machine of this size. Something nearer 65V with drivers and appropriate motors to match would give much better performance.

[GeorgeW21]

Hi All,
Can't believe its over a year since I updated this. I got the opportunity to move the the US with work so the CNC had to go on the back burner for a bit.

Neale - Good shout with the power supply being on the low side. I bought that stepper kit before really knowing anything so its probably not what I would go for ir I was buying again. I'm planning to get it up and running with the power supplies I have but will probably look into putting a larger one in.

The mechanical design has gone through a number of changes and fluctuating goals but I've now got my mechanical design to a point where I am generally happy with it. Losing access to a workshop or garage has meant the size of the machine has needed to drop quite a bit. I've just recieved the 80/20 extrusion for the chassis and the aluminium plate has mostly arrived for the X and Y axies. This has all come as remnants and offcuts from eBay.



Here's the controller mainly wired up testing with the little machine I scrounged.



Cheers
George