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Thread: expanding arbor

  1. #1
    Join Date
    Feb 2006
    Lowell Ma.

    Default expanding arbor

    In my recent "tool gloat" thread, I mis-identified an item.
    I called it an expanding mandrel, when it's really an
    expanding ARBOR.
    I actually got three of them...a 3/4", a 1", and a 1 1/4".
    The two larger ones have a 1/4"-28 socket head screw with a
    taper on the head.
    The 3/4" arbor is missing it's screw, I tried a #10 screw, which
    is too big to go into the clearance hole, a #8-32 almost wants to start but not quite.

    Does anyone have one of these 3/4" expanding arbors that they
    could check the screw size and thread?

    Also the two drill chucks I is a Jacobs ball bearing
    super chuck 14N with 5/8" straight shank arbor, at this time isn't
    so super, it's a little jammed and I can hear a ball or two rattling
    around inside.
    The other chuck is a CVA 5T made in England with MT#2 arbor
    and it is pretty stiff too.

    I think there was a recent thread about doing a tear down
    and rebuild of drill chucks, I'll have to search for that and give it
    a good read.
    Mike Green

  2. #2
    Join Date
    Dec 2007
    Castlegar BC Canada

    Default brockley1

    If the metal in the arbor is soft enough to machine, use a pipe tap and get a allen socket pipe plug. Peter
    The difficult done right away. the impossible takes a little time.

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