Re: [CAD_CAM_EDM_DRO] Ballscrew Slop Question.....Solved!

You say the bearings are noisy,
Test : If you feel a little steping when you turn the screw by hand, than it is not that
you have to much preload, but the bearings are worn.
Then You should test your ballscrew too. They dont like hard kicks produced by
the combination of high acceleration (G00) and a lot of backlash.
Good luck
Sven Peter

jh1221@... wrote:

> Hello All, Thanks again for all the great hints you gave me to try
> and get rid of the .002-.003 slop I had each way in my new
> ballscrews. First of all, the slop was in the bearings in the left
> hand end-cap of the Bridgeport. Here's what I did. I figured that if
> I were to add a shim between the two inside races, I would
> essentially add preload to the two bearings, and eliminate the slop,
> right?? Wrong! I added a .004 shim and when I reassembled everything,
> there was .004 slop each way for a total of .008, I was creating more
> slop!!!!! for the life of me couldn't figure out what I was doing
> wrong. Then on a whim, I miked the bearing races (width) the outer
> race was .607 and the inner race was .604-.605, AH-HA! there already
> was preload and I basically took it out with the addition of the
> shim. Now I made a new shim to add between the outer races, to give
> it more preload( I removed the shim between the inner races) I
> started with .004 and upon reassembly, I found that there was
> about .001 slop each way for a total of .002....not bad, but I wanted
> better. I removed the .004 and put in a .006, reassembled and
> viola, .0005 each way for a total of .001 slop. Much better for CNC
> work. However, now there is a slight drag on the handle, and the
> bearing is a little noisy. I'm sure that the bearings aren't made
> for that much preload, and I'm probably shortening their life span.
> I'm also sure that proper thrust bearings are the only way to go, and
> I will probably invest in them, but this is surely a low cost
> alternative. John
>
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