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New bridgeport question

Kody

Plastic
Joined
Oct 20, 2022
Location
Olivehurst, CA
Secured myself a new to me bridgeport that needed a severe cleaning. Got it all broke down and I realized it has been converted to a ball screw set up and they are totally shot. Anyways, I’m definitely going back to the original style nut and I’m curious if the nuts will fit the rods or do I need to hunt down the original acme thread lead screws. Thanks!
 

Cole2534

Diamond
Joined
Sep 10, 2010
Location
Oklahoma City, OK
What does a 'totally shot' ball screw mean to you?

The nuts/screws on a manual machine can be fucking wasted, as in razor sharp acme threads, and still be accurate. Even more spr if the machine has a DRO.
 

car2

Stainless
Joined
Sep 19, 2009
Location
Apex, NC
Seems I recall reading on here also that folks have made leadsrews from stock acme threaded stock also. As stated, with a DRO the leadscrew wear isn't in itself a major issue.
 

GregSY

Diamond
Joined
Jan 1, 2005
Location
Houston
Are you guys sure you can't use an acme threaded rod with ball screw nuts?? Seems to me I can't think of a single reason they won't work together. They're both, ain't they?
 

Nmbmxer

Hot Rolled
Joined
Jun 22, 2008
Location
VA
One of my manual mills has ballscrews and I like using it a lot, climb cutting is great. Just lock an axis if it's stationary.
 

Kody

Plastic
Joined
Oct 20, 2022
Location
Olivehurst, CA
Thanks gents, I think I’m just going to try tracking down replacement nuts from whoever made the one I have already. I didn’t realize at first the bracket has been changed out to accommodate the ball screw set up therefore I’d have to replace that, both rods and buy the nuts and I’m not trying to spend that kind of money on things 🤣
 

eKretz

Diamond; Mod Squad
Joined
Mar 27, 2005
Location
Northwest Indiana, USA
Are you guys sure you can't use an acme threaded rod with ball screw nuts?? Seems to me I can't think of a single reason they won't work together. They're both, ain't they?

Why don't you try it out and get back to us... :D

Thanks gents, I think I’m just going to try tracking down replacement nuts from whoever made the one I have already. I didn’t realize at first the bracket has been changed out to accommodate the ball screw set up therefore I’d have to replace that, both rods and buy the nuts and I’m not trying to spend that kind of money on things 🤣

You might be able to refill the nuts. Round up as many balls as you can and measure them. Get some more to replace any missing ones or even a full new set. Sometimes the balls are staggered in size, might want to ask the manufacturer if they can give you any advice.
 

guythatbrews

Hot Rolled
Joined
Dec 14, 2017
Location
MO, USA
Why don't you try it out and get back to us... :D



You might be able to refill the nuts. Round up as many balls as you can and measure them. Get some more to replace any missing ones or even a full new set. Sometimes the balls are staggered in size, might want to ask the manufacturer if they can give you any advice.
Try this if the nut and leadscrew look fairly good. Sometimes the little recirculating tube can come loose or break allowing the balls to fall out. Can't really think of another reason the balls would fall out else. The balls are available in maybe .001 increments so while it's on the bench you can try bigher balls if youve got backlash. Of course you'll have to make sure it's not too tight at the ends of travel.
 

AlfaGTA

Diamond
Joined
Dec 13, 2002
Location
Benicia California USA
The balls are available in maybe .001 increments

Try millionths.....For a real rebuild of a ball screw the pros often do it empirically.
Most machine shops don't have the measuring accuracy to spec the actual size of the balls needed
Repair shops test fit going in steps of 10 or 20 millionths.... There is no compression between ball screw and nut so going too large can
quickly kill the tracks in the nut or screw...Too loose and there is no point to going to a ball screw.
Cheers Ross
 








 
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