Quote Originally Posted by everyreasonto View Post
I hadn't seen the seller linearmotionbearings before.. boy is he cheap!
When you've decided what lengths of ballscrew and rail you want send him a message with the sizes and he will list them on eBay.

Quote Originally Posted by everyreasonto View Post
I'm really liking the look of the machine you posted Jonathan but wouldn't I need two ballscrews and two steppers on the X axis?.
Yes you would - it's the best way to do it anyway. You could link the two ballscrews with a timing belt and just use one stepper motor. Another way is to use cables beneath the gantry (like on a drawing board ruler) to link the two sides...

There's more about it in my build log, probably just read the last few pages!
http://www.mycncuk.com/forums/showth...outer-building...
Also here for more pictures, though this isn't neccecary for the size of your machine.
http://www.mycncuk.com/forums/showth...t-design-ideas

Quote Originally Posted by everyreasonto View Post
Budget is my only constraint, excluding spindle, I have about £1000 to spend.

Taking advice on the stepper drivers, I've found some from a seller called cnc4you. I also intend to get my steppers and ballscrews from there.
£1000 not including spindle should be plenty...less than I spent.
Get your ballscrews from linearmotionbearings. They will be exactly the same and end machining is very very cheap. Look on eBay for stepper drivers - there's some 80V ones that look tempting, or if not this is what I got because at the time they were not on eBay cheaper:

http://www.zappautomation.co.uk/pm75...71a69c8def8e2f

I also used the 3nm motors...

I think steel box section is much more cost effective than using extrusion. Definitely for the stationary parts where weight isn't an issue.

There's a pdf with all the drawings for the ballscrews/blocks etc in one place here ...
http://www.file-vault.us/pdfs/ball_s...umentation.pdf