1200mmX900mmX170mm 4axis cnc

[Nickhofen]

Cheap Bob's are like playing Russian roulette with a nearly full magazine.!! . . . . Long term they are not worth the hassle because at some point they will fail or cause issues along the way which will appear like coming from other areas of the machine. Before I started with CNC I had full head of hair and now I Dazzle planes on sunny day and I blame all on of cheap BOB's.!!!

I work at Air Force so I have enough help from my job to grow a bald! Lol!!!
Any suggestions about a proper bob that I can make it work like a Swiss clock with the uc300 and all that at an affordable price...ops!

[Nickhofen]

Finish the power supply, thanks everyone for the help.

[Clive S]

Brill

It is good practise to not to daisy chain the 70V across each drive ie. use separate power leads from each drive to a common block and then connect the PS to the block. This ensures you are not getting a volt drop to each drive from the first one.

[Nickhofen]

Thanks Clive, I will keep this in mind!!!

[Desertboy]

That's super tidy, I see you went DC in the end. What voltage output transformer is it? 50v?

I wired the transformer to a 13 amp light style switch and then my VFD and water pump to another switch and both of them are wired from the emergency stop.

This way I can easily turn the transformer on/off and if the vfd is powered the water pump is on. I have both switches and the emergency stop at the front of the machine for easy access in a row.

If I hit the emergency stop it kills power to both the steppers and the vfd, I still have to work out how to get it to trigger an estop on the pc but it's good enough for me at the moment.

[cropwell]

I still have to work out how to get it to trigger an estop on the pc but it's good enough for me at the moment.

Just use a relay with a 230VAC coil.

[Nickhofen]

Thank you both for the idea, any wiring diagram will be helpful.
Desertboy you are right it is a 50V output transformer.

[Nr1madman]

Nice progress!
Does it feel good to move forwards? :D

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[cropwell]

Does it feel good to move forwards? :D

In my case it would be good to get back to where I started - spent the afternoon reassembling my lathe and getting the safety switches operating reliably. Then reinstalled the VFD (when I took it out months ago to fix the broken mounting lugs, I photographed the connections and labelled them as I disconnected each one). Now I am getting a code that says low DC bus. I sense a new thread coming if I can't sort it easily.

[Nickhofen]

Nice progress!
Does it feel good to move forwards? :D

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I feel that I have so much to do that this looks like a baby step....thanks for the motivation!