Fixed z axis to gantry design

[JAZZCNC]

The nut should be under the gantry and the screw moving with the bed.

That puts the linear bearings permanently underneath the cutting head.

Looks a bit odd, but if you draw it you will see enormous benefits.

Robin I agree the swapping the bearings and rails gives a good benefit because has you say the bearings are always in prime location providing Max support but the screw moving with the bed isn't needed and creates more Mass to move and complexity. Moving the Screw, Bearings/mounts, Motor etc. means the Negatives out weigh the advantages in this case.

Not being funny or picky here but please stop calling it the gantry it's the base Frame and I'm easily confuddllledd. .

[Robin Hewitt]

please stop calling it the gantry it's the base Frame and I'm easily confuddllledd. .

With both methods the rails have a length equal to the table travel plus the overall width of the bearing block assembly.

In this topsy turvey arrangement I am advocating the block assembly width is tiny in comparison, so the rails are short.

If you could bolt the "base Frame" to a workbench this could look ultra neat.