Originally Posted by
Cartierusm
So I'm thinking about converting my First brand Mill to CNC. I've build CNC's from scratch before, so this shouldn't be too complicated. I will have to work somthing out for the screws as I don't want to spend a fortune. Also the bed needs some work as it's looser in the center than at the ends, of course, but if the motors I use can drive the tighter spots then I'll leave it.
I've already got a CNC router I build from scratch using Keling 8078 drives, which I hooked up with quick disconnects so luckily I'll use one computer, drives and PS for both, one at a time of course.
I want to use belt drive system as I think it will be better than direct drive as my bed is probably a little stiffer than it should be, maybe, I haven't really testing anyone else's. I'm going to use a 72VDC PS and the 8078 Keling Drives with 1810 oz/in. Steppers.
So the questions are:
Are belt drives fine to use, will they stretch or anything else I need to consider. Will it be just as accurate with the belt and pulley?
Using a 2 to 1 ratio with the bigger pulley on the screw will that increase the power from the motor as there is more leverage?
I'll be driving the quill, I figure I'll find a way to drive it from where the quill handle is, is there any reason not to do this?
If I were to drive the Z from the Knee obviously it's way heavier how does Mach 3 know that it needs more inertia to drive it, or is it all based on the signal the motor recieves. Meaning when it's tol to go 100 steps, it also give a time it should get there so the motor speeds up to meet the speed it's trying to achieve? I figure if it can't meet the speed by driving the mass of the knee it's missteps?
Well that's it for now, tomorrow i'll be removing the bed and measuring the screws and taking lots of picture.