Im designing at the moment a leight weight low cost 3axis router/engraver, i have pretty much sorted the design in my head for the axis movement, i am how ever stuck upon how to drive each axis. From a little bit of deduction and a lot of trawls through the posts here ive managed to narrow my choice of lead screw support bearing assemblies down to 3 choices. Id like as much feed back as possible for my choices, TIA.
Rough Spec.
Cheap as possible
simple to build as possible using easily obtained parts in the uk
as little machining as possible
With that in mind ive ruled out turning my threaded rod to a non threaded profile for my bearings to make contact with, and would like to use less than two bearings per end of the lead screw, (this is a prototype machine and if i feel that i can improve it by altering bearings at a later date i will, but for the time being its all about making as high a preforming machine as possible, as simply and cheaply as i can)
As ive stated before ive pretty much narrowed my choices down to 3, so if you could vote and comment on my 3 sketches (lead_screw_support_bearings.gif) it would be much appreciated
Heres a quick breakdown of the design :
Design A- Flanged bearing
- Bearing interfearence fit into mdf
- End nut loctite'd on
Design B- 4 Screws holding washer down
- Adjustable??/Misalignment forgiving
Design C- Bearing interfearence fit