Gents.

first of all, thanks you all so much for your input. You are all clearly much more astute than I. To be quite honest Im still pulling myself back together after reading Jonathons post http://www.mycncuk.com/forums/linear...ign-ideas.html about how one day he decided to manufacture the driven ball screw nut housings. That is on a complete other orbit to anything I have ever done / made.

Dont get me wrong. I have a metal lathe / miller of sorts


but ive never made anything close to the type of engineering displayed by Jonathon in that post. To be quite honest its now making me doubt my ability to persue the static ballscrew idea.

So Im reverting back to the idea of spinning screw static nut.

Also, I can see where I went wrong in my blogs and I have mislead everybody. To be clear forget about 3 meters. the bed im planning to make will be at best 1700mm by around 1100mm