Comparing motion controllers...

[Clive S]

3 – I could let both ballscrews be driven from the same motor but I guess that would require a belt and with that I would loose some of the precision.

This is one of the standard ways of doing this and has been proved to work well. If you look through the forum there are many cases where it has been done this way.

Installing a second switch as your point (1) will not work. Point (2) Will work as Jazzcnc has already said (but it is not an elegant way of doing it). Not sure what you mean in point (5) it has nothing to do with the homing sequence

[komatias]

To answer your last point,

When you set up your stepper drives system, you should set the drivers to microstep. That will make them run smoother and also allow you to have better resolution of angle. 10-16 microsteps is good depending on what resolutions you really want.

[JW1977]

Not sure what you mean in point (5) it has nothing to do with the homing sequence

I thought that if i choose a motor with a higher resolution it will only go half as much distance every time the motor "bumps" the wrong way...

[njhussey]

3 – I could let both ballscrews be driven from the same motor but I guess that would require a belt and with that I would loose some of the precision.

I use a belt and a single stepper and an IP-M and I'd say that I'm not losing any precision! I cut plastic bearings for work and easily hold tolerances down to 0.1mm (although plastic does creep after machining) and I'm sure if I cut some aluminium or suchlike I could hold better tolerances...in short what I'm saying is that a belt will not lose you precision but will mean that you can't rack your gantry and only need one homing switch not two....lots of pros and can't see too many cons (apart from having a long belt running at the back of my router.)