Here we go again . . . MK4

[routercnc]

Also, I'd made a few design changes a while back but hadn't posted them so here they are.

1. Z axis
-Twin ballscrew instead of single
-Main body machined from solid
-Upgrade from 15mm miniature rails to 20mm Hiwin





2. Y axis
-Double ballnuts, one fixed ballnut housing and one floating housing to allow pre-load to be added
-Simpler bracing pieces


3. X axis
-Double ballnuts, one fixed ballnut housing and one floating housing to allow pre-load to be added