jon's homemade cnc

[JAZZCNC]

Im also thinking of buying a 2nm stepper fot the z as oppoesed to the large 3nm ones i have as theyre quite heavy and big? Comments and critisisms welcome!

Not criticism but slight concerns.? @72V on what I think are 75V drives then your very close to Max with not much room for back EMF. Hopefully you'll be ok but if the drives start tripping then chances are that will be the prob.! . . . I wouldn't be running silly high velocity's just to be on the safe side.

The difference between 2Nm or 3Nm weight wise won't make a jot of difference with these drives/voltages running on ball-screws because the mechanical torque ball-screws produce is awesome and really both are more than enough if all your attaching is a router or WC spindle etc. Also with a Z axis you tend not to run high velocity but more acceleration so the available torque is higher has your not so close to the motors corner speed.
Personally I'd use 3Nm for continuity with rest of machine.

Looking good and soon be cutting.?

Tip: cover them sides before you start cutting else all the crap gets onto ballscrews and shoots every where in all directions. Amazing how much sides really help contain the mess.


Edit:
Just spotted that the top box section with rails on is only supported at it's ends. I think you'll find you could suffer from resonance problems at certain depths or feeds esp in harder materials. I Know it certainly will show an effect on finish quality in Aluminium.
Know you've painted it now but I would seriously consider adding some support in the middle, it will pay back in quality of cut believe me.

Edit 2: Eh eh sorry about the add-on's.!! Just spotted that you have the bridge rectifier on a bracket. Really It wants to be on a heat sink, stick it on an old PC CPU heat sink and then fasten that to bracket.