My 1st homebrew CNC.

[Kammo1]

Many thanks guys for all the tips. Just got off the phone to my mentor and CNC guru John S and has given me some excellent tips and a way to get X axis bearings aligned perfectly which I didn't know how to get around and his idea is almost foolproof and will guarantee they sit nice and snug against the rails without splaying or binding he is the man!!!!!!!!!!!!! I am hopefully going to get John to come round when he has a few spare minutes and we can go from there. Guys if you are ever stuck on anything CNC John will have certainly done it or will give some sound solid advice on how to get over a hurdle the man is a genius. Laz.

[rinderpest]

If you ever use trapezoidal ACME thread Im told that a good low backlash nut can be made from that low melt point plastic called polycaprolactone (or PolyMorph, Shapelok, etc).
The way its done is to make a piece of it around the right size with a rough hole just larger than your ACME.
You then heat the ACME with boiling water etc then clamp the plastic onto the thread. The thread heats the plastic to the point where it will mould itself around the thread.
When its set or just about set you unscrew the ACME, job done.
Apparently it takes a few goes to get it exactly right but then its easy.
I've not tried it yet but I just ordered some polycaprolactone granules, 100g for £1.25ish.
Very handy stuff for other things too Im told. Provided its not paper thin its very tough stuff, have a Google for some of the interesting uses people have found for it.
When mine arrives I'll start a thread with photos and see what sort of results I get.