First Proper CNC Router

[diycnc]

I think i need to check my PSU calcs. Can someone point me towards some example PSU design calcs?
Also, any idea if there is any benefit of AC vs DC?

[JAZZCNC]

I think i need to check my PSU calcs. Can someone point me towards some example PSU design calcs?
Also, any idea if there is any benefit of AC vs DC?

There is absolutely no difference. I've built loads machines using both and see no performance or reliability differences between AC or DC.
The AC is simpler for obvious reasons so my suggestion is go with AC.

Also, 525Va transformer will do what you need. 625Va will give you a bit more overhead, which you won't need, but does increase inrush and that could give you issues with MCB trips. However easily solved with D rated MCB.

[diycnc]

Thanks JAZZCNC. Will go with AC.

Only 70v toroidal transformer I can find is 500va, which I think should be plenty.
https://www.rapidonline.com/vigortro...-x-35v-88-0007

What size MCB would you recommend?

[Clive S]

Thanks JAZZCNC. Will go with AC.

Only 70v toroidal transformer I can find is 500va, which I think should be plenty.
https://www.rapidonline.com/vigortro...-x-35v-88-0007

What size MCB would you recommend?

I pointed you to one in post #47

[routercnc]

I went with a 10A Type D MCB in the end after trying a 6A Type D MCB that kept tripping on start up.

Note that my transformer was 750VA, 2x24v in series, (I'm running 5 steppers, with 2 steppers on X and Z) so you could try the 6A one first as they are not too expensive.