I am building av CNC router size 1000x2000x200. On the longest axis I use two 20 mm ball screws having 10 mm pitch. Gantry weight is about 25 kg. My first thought was to run it with one motor located between the screws and driving them with a single timing belt to avoid having two motors on the same axis. I do not like the idea of having two motors too much since I could risk the gantry being teared to death if one of them stops, and I find no way to make sure the axis is squared after i stop the machine. So I have these options. Which would you go for?
1. Single motor, on a timing belt.
2. Dual motor with synchronization timing belt to prevent screws to get out of sync
3. Dual motor with individual end switches to keep the axis squared.
I tried to set up option 1 with a XL timing belt and pulleys. but I managed to tear the timing belt which I ran on 15T pulleys. Which timing belt / pulley size should be used for this kind of applications, XL, L, HTD, GT - there is a jungle out there. Also are any of you aware of a controller that lets you set individual endstops on a dual motor axis?