re-load balls screw to reduce backlash?

[cncuser1]

Originally Posted by cncuser1 I'll wait for the O/S balls and see what happens, Balls are shipped by postal service so it may be a week or more, stay tuned and thanks again.

So I recieved the .0660" balls.
long story short... even using one .0660" for every five .0642"" balls the nut would jam up.


So for the time being I will have to bbe satisfied with what I have.

i amm still curious about some of the other quuestions that came up in this thread.

[NC Cams]

Your oversized balls are off by a factor of about 8 to 10!!!!

To preload a screw, you need to go O/S in steps of 0.0002" or so, not 0.0020". Granted, these will not be easy to find as increments that size are only stocked by the screw makers or outfits that specialize in screw reworking.

When clearance in the screw is measured in 0.001 to 0.010 MILLIMETERS, it should not be at all surprising if a single 0.002" O/S ball would jamb things up.

[cncuser1]

Originally Posted by NC Cams Your oversized balls are off by a factor of about 8 to 10!!!! To preload a screw, you need to go O/S in steps of 0.0002" or so, not 0.0020". Granted, these will not be easy to find as increments that size are only stocked by the screw makers or outfits that specialize in screw reworking. When clearance in the screw is measured in 0.001 to 0.010 MILLIMETERS, it should not be at all surprising if a single 0.002" O/S ball would jamb things up.

Yup I figured as much.I would have taken something smaller but it wasn't available.

know any sources of O/S balls aside from Salem?

[NC Cams]

Google "precision steel balls" for potential sources.

Might try Winstead Precision Ball as they make them. This is now a division of SKF if memory serves correct.

First go for grade 25,

Then 10, then 5 then 3.

Grade 3's are unbelieveably round and smooth and as "perfect" as you can get.