Originally Posted by
dannystooblue
I converted a medium sized benchtop square column mill to cnc before I had 1/2 a clue what I was doing. I ended up talking to Marriss at gecko drive and he opened my eyes a little to what I was looking for. First off was the motor limitations and the fact that peak and rated torque were two very different creatures. I had geared 2:1 on my y and z but 3:1 on x, and I did this because it made since to me at the time. After the conversation I realized that running my ballscrew at 1/2*3500 or 1750rpm would not be good for it, the second thing I realized that the motors I had decided to use were a little on the small side. The solution was to gear them out a little farther. For z 3:1, x 4:1, and y 3:1, 4:1 was the max without making new motor mounts, and it gets the screw down to a speed at which it should live well while giving me the torque to do a few things. I have a flash of it running in the gallery with the old configuration, I haven't redone the video yet but expect the accel/decel to be a good amount better. Oh... when I converted to the GIF format it sped up the thing a little, not 50% more but maybe 20% faster than actual.