Help needed with PM-940m CNC VS conversion to the Acorn Controller

[rickwjenn]

First my thanks to Pburgh, CNCkeith, 762X51, and MartysCNCGarage for all the great info here. It was very helpful..

First thanks to pburgh, cut2cut, phazertwo - all the info you guys shared was very valuable as I read and re-read then went to work...

Got my PM-940CNC VS a few weeks ago. Spent one day looking the nMotion controller and the terrible documentation and ordered the Acorn.

Rewired all the home and limit switches to be NC and got a new NC E-Stop Switch.

"Bench" tested with the Acorn on the bench and jumpers running to the Stepper Drives as first step.

Then mounted Meanwell RD-RD35B where the nMotion was and used 10-32 threaded rod to build a stand off mount for the Acorn.

Getting the spindle motor running took the most time and I eventually pulled the relays and when direct from Acorn to the Delta VFD - that did the trick and out came the relays and their wiring...

Bought Fusion360 and am going to start making some simple parts for my muscle cars and my dads '58 chevy truck. With the mill and my Miller MIG, Miller TIG, and all my handtools I feel like I can fab just about anything. Sheet metal brake and sheer is next tool!

Here come the pictures....

[rickwjenn]

Acorn in its new home....

[rickwjenn]

What came out - 24V powersupply, nMotion controller, relays, wires.

[rickwjenn]

Acorn in and relays out....

[martyscncgarage]

Nice. And all running good?

[rickwjenn]

Mill ready for use....

[phazertwo]

How did you wire the fwd/rev for the VFD w/ out the relays. I re-used the relays but would like to use them for other things, so cutting them out of the VFD control would be perfect.

Thanks
PZ

[pburgh]

Rickwjenn,
Glad our combined info was able to help. Your setup looks good. Please be sure to use Marty's spreadsheet to set the motor tuning, it's invaluable. Also, check to be sure that your z axis is running true on movement. You may find that you need to remove the manual crank handle gear so it doesn't interfere with how your z travels. (I was able to remove it from the front without having to remove the control cabinet) I know Jake, PZ and myself had to remove it and the z works better. Also if you get the MPG, be sure to see cnckeith's post on tuning. You should increase to 2000 counts. If you have the Leadshine drives/motors, they are probably set to 1600 from the factory.

Best of luck,
Doug

[rickwjenn]

PZ

cut2cut provided the direct wiring for Acorn to Delta VFD w/o relays at https://www.hobby-machinist.com/threads ... 196/page-2

I give him all the credit!

[rickwjenn]

Rickwjenn,
Glad our combined info was able to help. Your setup looks good. Please be sure to use Marty's spreadsheet to set the motor tuning, it's invaluable. Also, check to be sure that your z axis is running true on movement. You may find that you need to remove the manual crank handle gear so it doesn't interfere with how your z travels. (I was able to remove it from the front without having to remove the control cabinet) I know Jake, PZ and myself had to remove it and the z works better. Also if you get the MPG, be sure to see cnckeith's post on tuning. You should increase to 2000 counts. If you have the Leadshine drives/motors, they are probably set to 1600 from the factory.

Best of luck,
Doug

Doug - thanks for the additional info, I definitely want to get the Z crank off and with follow your suggestions when I get in the garage this weekend. Lots to do one way to first simple part .thanks again!