bdring wrote:...I think for PCB milling you want a higher speed than this geared down version. The water cooling would be a pain.
I like it!
i will definitely want to add that as an option to my Hadron build. I was thinking about this before - you're right about PCB drilling- high speed but low torque is ok , and considering how inexpensive RC brushless motors have become, i would prefer to have 2 separate mounts , one geared down for machining light metal and plastic, and another just holding the high-speed motor with a 1/8" collet chuck substituted for the motor shaft itself and better bearings installed.
I also agree about water cooling - its efficient but not too practical on such an elegantly simple & portable platform - so "heli" style motor with integral cooling fan would be the way to go i think.
What may be more of a problem though is the Z-axis feed rates; for drilling PCB's they need to be quite fast (it explains why the refer to holes as drill "hits") otherwise you burn the board and ruin the bits pretty fast.
I was just thinking about that earlier this morning - there's 2 options i think to increasing the Z- speed:
1 - change the leadscrew system for something else, maybe timing belt again ?
2 - add a secondary, short throw but fast Z- axis, on the spindle itself.
I'm not sure which is easier or better. Option #1 requires significant re-engineering of the ORDbot platform, so not so easy.
But it would be nice i think to make all linear motion based on a common system (timing belt) like the X and Y.
Option #2 is probably easier as an add-on, but still a little tricky to keep it light and thin enough so you don't end up with the spindle axis cantilevered too far out in front - even a little flex when drilling 10 thou holes will either make the hole miss its mark or more likely snap the bit.