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  1. #1
    Join Date
    May 2010
    Location
    tasmania
    Posts
    96

    Default AL960 funny noise

    I have been doing some low-speed screwcutting and notice that there is a vibration as the lathe slows down after switching it off. I did not particularly notice it before when doing higher speed work but it does it as the lathe slows from any speed when I checked it today.

    It seems totally normal when actually running with no significant vibration even at the slowest setting.

    I wonder if it is the spindle bearing

    Am I worrying about nothing?

    P.S the AXA toolpost is going very nicely

  2. #2
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    6,216

    Default

    Often you find high speed shafts/gears will resonate and vibrate at a certain speed, and they will not vibrate at any other speed...

  3. #3
    Dave J Guest

    Default

    If it seems fine when running, I don't think it will be the bearings.
    I would change the belt first, most of these machines are supplied with cheap belt's.

    Dave

  4. #4
    Join Date
    May 2010
    Location
    tasmania
    Posts
    96

    Default figured it out

    The advice about the belt jogged me into action. I had just replaced the belt as the stock one is a bit short to easily get into the slow pulley (in fact the size specified on the belt is right- It is actually a size smaller than marked!).

    To get the belt onto the slow pulley it is necessary to remove the 120/127 gear (I hope that the designer has been sent to the salt mines).

    Anyway, I have just had a bit of a play round and found that the noise is coming from the gear train. I had not properly adjusted the mesh when I put the 120/127 back on

    Properly adjusted, all is sweet.

  5. #5
    Dave J Guest

    Default

    Good to hear you got it sorted.

    Dave

  6. #6
    Join Date
    Aug 2008
    Location
    Adelaide
    Age
    68
    Posts
    1,373

    Default

    I agree, the belt change is one of the few niggles with the 960B, I tend to leave mine in low position as the slowest speed in high range is too fast for screw cutting and I do a lot of that and parting off. The size marking on the belt is confusing. According to the local bearing & belt bloke, the Taiwanese & Chines measure the belt length at the bottom of the pulley groove whereas the poms and yanks measure it halfway up the side of the pulley sheaves - hence the different markings.

    When I set the mesh for the 120/127 gear I use a piece of thin paper between the gears to set the gap. It' an old trick but it works for me, I generally use a bit of newspaper.

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