The side posts are 24" above the top of the square frame at the bottom, so minus some for the fixed crossbar and the Z axis gantry, and however far the hot end projects below that, and however high up the bed will be. Between the posts is 11.25"
So height will be whatever space is left after mounting everything.
I haven't checked the bed for flatness. Are they usually pretty flat or do they need to be pressed under glass? I'm thinking of a metal vacuum platform to suck it down, like a vacuum forming table.
Got any sources for affordable ball screws? I'm leaning towards having them under tension with angular contact ball bearings at each end. I've read that a tensioned screw can be run up to 2x faster, or a smaller screw can be run as fast as a heavier, untensioned one. Normally not a need for real high speed in 3D printing, but time can be saved on rapid moves when not printing. I have some ideas for printing multiple copies or things.
I'm converting a JET 9x20 lathe to CNC and for the cross slide there's only room for a 5/16" ball screw. Definitely going to be putting a little 'stretch' on it to avoid having it flex. I was wanting to get a Denford ORAC lathe but after finding a site showing a complete teardown - those lathes are a Compact 8 clone and I can make the cross slide have more usable travel than what Denford did, and they only used an 8mm diameter screw, untensioned.
Statistics: Posted by Galane — Fri May 29, 2015 3:24 pm