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  1. #1
    Join Date
    Jan 2012
    Location
    Victoria
    Posts
    3

    Default Hercus Model A 9" gear set

    My apologies if already covered but I can't find what I need.
    I have a Hercus Model A 9" with a quick change box.
    Most of the change gears are missing.
    Can anyone tell me how many gears are in a standards set and what the tooth counts are please.
    A photo of a standard set up on the lathe would be most appreciated.

  2. #2
    Join Date
    Aug 2015
    Location
    Adelaide
    Posts
    239

    Default

    On the standard set up there is a 20 or 40 tooth gear (depending on which feed/screw cutting rate you are using from the gearbox plate) for the gear that drives from the reversing tumbler with then drives an 80 tooth idler gear to a 56 tooth gear on the gearbox.

    You should have a 40 tooth gear on the gearbox which interchanges with the 20 tooth gear.

    The attached pic may help understand what i am talking about.

    If you were talking about the gears for cutting metric threads then there is a totally different set of gears for that.

    Regards Steve
    Attached Images Attached Images

  3. #3
    Join Date
    Aug 2015
    Location
    Adelaide
    Posts
    239

    Default

    This might be a better description for you with these pics.
    Attached Images Attached Images

  4. #4
    Join Date
    May 2004
    Location
    Melbourne Australia
    Age
    60
    Posts
    37

    Default

    K
    M
    L m
    Quote Originally Posted by Tonyau View Post
    My apologies if already covered but I can't find what I need.
    I have a Hercus Model A 9" with a quick change box.
    Most of the change gears are missing.
    Can anyone tell me how many gears are in a standards set and what the tooth counts are please.
    A photo of a standard set up on the lathe would be most appreciated.
    Sent from my SM-G960F using Tapatalk

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