Hood,
  How much backlash did you actually have in your sloppy ol' beaver screw anyway ?
Just curious,
Russ

Great news Hood. I know the rewarding feeling when you find that your machine isn't as accurate as you thought and you manage to fix it and even make it better than the manufacturer's quote.

Daniel

Brett, what can I say, nothing like a tight Beaver.

JH
 Figured it would be hard to make it worse, even for me, so gave it a go and all worked out
 
RC
 turned out there was a lot more than I originally thought, once I tightened the gibs up I got a fright, have attached a xls of the readings I took. Hopefully the new ballscrews will be as good as they are supposed to be, they should be but the price is well under what rolled C7 would cost me, let alone C5 rolled so there is a niggling doubt until I get them and see.

Daniel,
 Yes I remember the trials and tribulations you had with the emco, certainly seems to be working now

Hood

Wow - that much backlash!!! And I thought you were complaining about a few microns as usual... But this is unacceptable even in my terms.

Daniel

Yes, could live with a bit of backlash but not that much, the Z is great, less than 0.005mm from what I see and even the knee only has 0.03mm or so in the bevel gears. Fitting new balls in the X and Y and then making new shims for the ball nut spacers probably would have reduced the backlash to acceptable amounts but when I found ground C5 ballscrews for £240 delivered, I decided it wasnt worth it. I do plan on reusing the X axis screw for the tailstock on the lathe so may have a go at reducing the backlash in it just to see even though it wouldnt matter for a tailstock as the quill is hydraulic it just need to get within +-90mm LOL.

Hood

Quote
Quote from: Sam on January 11, 2010, 10:08:28 PM
lol @ Brett
   LMAO@Brett too.......still.
Russ

 
Posted on: January 11, 2010, 10:08:28 PMPosted by: Sam 
Insert Quote
lol @ Brett

Whatd I do? 

Brett

Well I got the ball screws today and can say they seem to be everything I was hoping for and more. Class5 precision ground ballscrews with antibacklash nuts and quality looks excellent.
 Hope to get time this weekend to machine the ballscrews and may have to make new brackets to mount them as the nuts look to be a bigger dia than the ones that are on.
 For anyone in the UK looking for ballscrews I recommend you get in contact with Martin at http://www.motionandbearing.co.uk as I think their prices are hard to beat, I certainly couldnt find class 7 rolled ballscrews at these prices never mind precision ground class5.

Hood

BRAVO !
Good news for sure.
Better than any prices I found here in the US when I was looking.
Hoping they work out well for you and are as good as they look.
RC

H :DD,

Nothing better than having a good screw for the weekend.  and with a tight beaver . Ya , I faintly remember those days.LOL