Few pics of my homemade CNC mill

[wiatroda]

I use PM752 supplied with 65VDC. Transformer is 500watt.

[Jonathan]

Is this PM542 stepper driver? What voltage do you use?

If you're deciding which driver to buy then get the PM752. The higher voltage will make the motors run with higher torque at high speeds, and thus faster overall.

Currently I use the PM752 on 75v, though that should change in a few weeks when I've finished prototyping my 120v driver design...

I'm also using a 500VA transformer with 4 of the 3 N.m motors.

[m_c]

Just looking at your proposed new drive system, isn't it bad practise to use two motors coupled together?

[wiatroda]

Just looking at your proposed new drive system, isn't it bad practise to use two motors coupled together?

So far the only problem I had it was when one of the belts snapped and then the other motor was pushing Y car's one side only eventually snapping the second belt or stalling the motor. That's why I decided to use one ,long, strong timing belt. Why do you think there may be any negative aspect of coupling the motors together ?? I've attached mounting plate pic. I'll try to produce it asap.

[m_c]

Using two motors with one driving each side is ok, but I've seen it mentioned in various places that coupling two motors together can cause problems.

[wiatroda]

jupi machine alive again :))))
First in order to cut proper steel motors mounting plate I've made "very sophisticated" 3mm MDF plate.

I've put some corrections and CNC cut from 3mm steel plate, so far insides only.

Some inside circle cut-outs are perfect to hold a material while machine cuts outside profile

Just waiting for end result ;)

[h4ppy-chris]

i love it when a cnc makes it's self nice 1 mate keep up the good work. loving the pictures ;)

[wiatroda]

Thanks Chris
...and finished item

[h4ppy-chris]

looks good to me mate nice to see some steel and not ally ;) and here's a thanks

[wiatroda]

Tensioner shaft

with 3 pieces of 688z bearings each

Job finally done :)