Z-Axis design and advice

[Mad Professor]

The above was made from 20mm thick alu, 20mm Support Rails, SBR20 Bearings.

The main front part is 150x420mm.

There have been a few small design changes since the above.

The main two things is I quickly moved away from the TR16x4 Leadscrews, and upgraded to 1605 Ballscrew.

And added extra support for the stepper motor.

I am also no longer using a 1020w wood router for my spindle, but have now upgraded to a 2.2kw water cooled spindle.

Jamie Aust: Do you have access to any cad programs?

[jamie aust]

What sort of problems did you get with Trapezoidal screws, as I was going to use them on all axis 16mm.
As much as I would like ballscrew, it just want work with my budget just now.
Im looking at x=1200mm, y=900mm, z=300mm ( I may drop each axis down by 100mm )
nema23 motors x 4, tb6560 drivers x 4 (stand alone drivers) and PSU ( upgrade to G450 soon )
Cad software I have is Autocad, google sketchup and draftsight.
From all the reading I have done on Z-axis, I think yours will work best for me.
jamie

[Mad Professor]

Maybe I should of reworded it a little better.
I did not move away from the Trapezoidal screws due to a problem as such.
Just that a 1605 ballscrew with custom machined ends & ballnut, inc postage from Chai was cheaper then I was expecting.

One thing I would say is stay clear of the tb6560, I think I was one of the 1st on this forum to play about with them drivers, and it was nothing but hassle.
I do know some people that I using the newer tb6560 boards without a problem.
But nothing beats having good drivers.
I am / was using LeadShine 752 Drivers, but I am in a middle of a upgrading with NDA steppers & drivers.

Just waiting for some more funds, and soon my current cnc router will no longer be classed as a desktop unit, going to need a better shed.