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    Cat40 spindle rebuild: Thoughts on floating bearings outer races spinning in housing

    I did the run in procedure yesterday. It was interesting looking at the visible part of the spindle cartridge (directly outside the lower bearings) with a thermal camera. I could distinctly see that the single bearing in the triplex set was warmer than the other two. But after the run in the...
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    Cat40 spindle rebuild: Thoughts on floating bearings outer races spinning in housing

    I installed the spindle today. I guess time will be the real test. Still a lot of stuff to do before I run it, the rusty bearings were noticed while tearing it down to do a bunch of other stuff. I spent a while dicking with the alignment of the housing that retains the upper 6008 bearing and I...
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    Cat40 spindle rebuild: Thoughts on floating bearings outer races spinning in housing

    I attached a little diagram to my original post. The 2 bearings in question are preloaded with the locknut pressing the inner races together and the outer races have no axial restraint by design. Garwood, that’s interesting. I guess the only reason I have to think it’s wrong is that it just...
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    Cat40 spindle rebuild: Thoughts on floating bearings outer races spinning in housing

    Thanks Phil, I’m going to install it as is. I’m probably worrying too much, but I put a lot of effort into the rebuild and want to be sure every detail is correct. As for bearings I removed, the upper two were marked only NTN Japan 7009 xx The lower triplex set was 2 Fafnir 2MM9110WIDULC1 and...
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    $25k VMC Garage Buying Advice

    OP sounds like he's in a similar situation to me 2 years ago, except I had more general machining experience. I have the space, so I bought 2 older VMCs instead of 1 more reliable (expensive) machine. I've done a lot of fixing stuff. It's OK, I knew that going in. Things I wish I had known...
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    Cat40 spindle rebuild: Thoughts on floating bearings outer races spinning in housing

    The .0002" is a radial clearance, so .0004" diameter clearance. I greased the bearings with Kluber NBU15 at 1.5cc/bearing for the 7009 and 1.6cc/bearing for the 7010 bearings (15% free space). I erred on the side of too much grease, as getting precisely 1.5 or 1.6cc from a 50cc syringe is...
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    Cat40 spindle rebuild: Thoughts on floating bearings outer races spinning in housing

    Standing vertically in a free state, yes it does spin totally free in the bore. With just a tiny bit of side pressure, it makes enough contact with the bore to mostly stop the outer race from spinning. This is probably a small enough amount of pressure that if I set the spindle on its side, its...
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    Cat40 spindle rebuild: Thoughts on floating bearings outer races spinning in housing

    I appreciate all the responses. I am not about to loctite it. Even if I thought it was a good idea, I couldn't clean inside the gap for proper application without taking things apart. I can't get the assembly apart again without destroying the bearings. The lower triplex set is too tight a fit...
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    Cat40 spindle rebuild: Thoughts on floating bearings outer races spinning in housing

    Hi everyone, I've been working on rebuilding a cat40 spindle from a Milltronics VMC. This morning I assembled the spindle and noticed the upper bearing set outer races are spinning in the bearing bore. This is the upper set of angular contact bearings that is not restrained in order to allow...
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