Quote Originally Posted by mart154 View Post
Now, couple other questions have risen as well.
First, on this picture below theres a 15x60mm riser plate under the gantry. I was wondering if it might be worth extending it and put the X ball screw mount straight to it instead of the gantry endplate?
Swings and roundabouts really, both will work. The extended version will possibly make fastening and alignment easier.
Take some time to think about ballscrew alignment because little adjustments can make a big difference to performance and it doesn't take much to go from working fine to stalling motors, esp at higher speeds. So anything you do to make alignment easier you'll be thankful for when setting up.


Quote Originally Posted by mart154 View Post
Secondly. At the moment my Z rails are spaced 75mm apart, is this going to be enough or should I widen it?
Not 100% sure what your meaning with the apart bit.? Do you mean 75mm between bearings in vertical direction or 75mm between bottom bearings and top bearings.?

Anyway here's my take and way of doing it. The Z axis width or space between rails and bearings doesn't matter so long has you can fit everything like ballscrew between them. So you can make it just the minimum width if you like.!! . . . . What far more important is the bearing spacing on the Y axis and the more(within reason) you have the better it will be, obviously this comes at the cost of cutting width so it's a balancing act and personally I won't go any less than 200mm with 300mm being better. I tend to make my Z axis width 180mm or minimum 160mm.
I only ever really use profiled rails/bearings if can help it and these are much stronger so can get away with 200mm but if using round type rail I'd be looking for more.

I've also noticed you have the X axis bearing spacing very close together.? Same applys here has well but not quite the same with you running twin drive but I'd still try and get the widest foot print you can afford, even if it means extending the top rails past the ends slightly.!