Deckel FP1 vertical spindle brass bushing oiling point - Page 3
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  1. #41
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    Ross has provided some solid advice here ALG 100 nasty vertical head rattle

    I had a worn bronze bushing in my old mill, an ALG100.

    At that point I was not experienced enough (or had the equipment) to follow Ross's advice, and then the machine was sold. But it's knowledge that grows in you, even if you never apply it to where it was aimed for.

    BR,
    Thanos

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    I am not sure now, but if it's got movement, then I don't think lapping and removing more material will help. Since material cannot be added, I think a replacement bronze sleeve is required.

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    Funny - the last line in that thread is about adjusting the spindle nuts to improve runout. I did this last night and am now just under one thousandth of an inch runout (by hand and under power). Clearly tighter is better for runout. There are several posts about tightening these nuts for the needle bearing spindle as “finger tighten plus a little”. Is the same true for the bronze bushing? I ran the spindle at this adjustment for about 10 minutes without noticeable heat on the spindle.

    In a perfect world the bronze would be just plastic enough to allow me to incrementally tighten the spindle nuts over time and improve runout, but this might be wishful thinking.

    The good news is that the quill fits the housing very well and I have the new oiling tube installed.

    Thanks again,
    John

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  5. #44
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    Quote Originally Posted by DennisCA View Post
    Since material cannot be added, I think a replacement bronze sleeve is required.
    Not sure this is exactly true.....Believe since the spindle and the bearing sleeve are tapered, that one can tighten the radial clearance between the bushing and shaft(spindle) by
    moving the spindle axially. Believe there is a procedure in the FP1 manual for this....Requires precision surface grinding of the spacer and testing for fit.

    The caution here is that you need to make adjustments carefully. Reduction in the spacer length will tighten the clearance,if you go too far then you will have to make a new spacer and start over.



    Cheers Ross

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    Quote Originally Posted by Jcgrimes View Post
    The good news is that the quill fits the housing very well and I have the new oiling tube installed.
    Photos please, they will help the next person in this situation.

    Important: are you talking about "runout" which means that the spindle does not run true? Or are you talking about "free play" which means that you can shift the spindle position radially or axially?

    I always thought that one advantage of journal bearings was that you could adjust them with shims or spacers to reduce the play to the correct amount. On my Studer cylindrical grinder, the wheel head has a solid bronze journal bearing. The procedure to adjust it is to rotate two locking nuts until there is 50 microns (about 0.002") of end play in the spindle. The bearing taper is 1:10 so this yields 5 microns (0.0002") of radial play when dry. With oil and running at speed that free play is eliminated.

    You can not eliminate runout this way (runout indicates a non-cylindrically-symmetric spindle shaft). But you should be able to adjust out the free play (or reduce it to the correct amount).

    EDIT: I see that Ross has just posted the page with the correct procedure for adjusting the free play.

  8. #46
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    Quote Originally Posted by AlfaGTA View Post
    Not sure this is exactly true.....Believe since the spindle and the bearing sleeve are tapered, that one can tighten the radial clearance between the bushing and shaft(spindle) by
    moving the spindle axially. Believe there is a procedure in the FP1 manual for this....Requires precision surface grinding of the spacer and testing for fit.

    The caution here is that you need to make adjustments carefully. Reduction in the spacer length will tighten the clearance,if you go too far then you will have to make a new spacer and start over.



    Cheers Ross
    Ooh I missed that it was tapered.


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