[Jewelry making - Article 00802] - Re: [Orchid] Bearing removal on lapidary saw

[coralnut]

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Adrian,

    I have repaired many old lapidary machines and each one seems to be
    different.  It's been awhile since I worked on the old Star machines
    so I can't say with certainty that the bearings are held in place
    with set screws. If they are...it will be evident...the screws will
    be on a collar on the outside of the bearing.  If there are none
    there then they probably are rusted in place.  This is very common on
    old machines. One way to remove old bearings is the first clean the
    shaft outside of the bearings so they won't have to pass over further
    rust and dings in the shaft.  Use medium to fine sandpaper the clean
    everything nice and smooth.  Then...don 't use WD40...it is not meant
    to loosen things...rather it drives out moisture.  Get some really
    good penetrating oil such as Kroil soak everything very well and
    give it several days to penetrate.  Then use the end of a 2x4 against
    the bearing block and gently tap it off.  You should try to get the
    same size and type of bearing for replacement.  Shims are alright for
    temporary use but tend to loosen and shift over time. This is
    especially so on heavy duty lapidary machinery. Otherwise, good
    luck...Cheers from Don at The Charles Belle Studio in SOFL where
    simple elegance IS fine jewelry! dcdietz AT comcast.net 


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