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Thread: Compound Gears

  1. #1
    Tiptoeturtle Guest

    Default Compound Gears

    I wrote previously (not here exactly, in the Marketplace area perhaps) that the bore of Hercus change gears was 5/8".

    I was subsequently corrected by a more knowledgable member that the bore of Hercus change gears is 9/16".

    I now realise the (boring) truth is:

    Hercus plain change gears have a bore of 9/16" (and a keyway).

    Hercus compound change gears have a bore of 5/8". (Or something else, a larger bore even, if you remove the joining collar, the collar has no inner keyway, the collar has a bore of 5/8”.)

    Or, at least, that is the case on a 1946 model C.

    To satisfy my unending thirst for new information and partially assuage my uncontrollable urge for verbosity:

    Hercus made 36/18 45/18 54/18 63/64 72/18 100/127 and 120/127 compound gears.

    I am wondering if they made (and looking for to purchase secondhand) 27/18 or 90/18 ?

    Has anyone come across these ? Or are there any other compound configurations I have not listed ?

    Donald

  2. #2
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    64
    Posts
    4,887

    Default

    Don't think you will find those compounds too easily as 2nd hand units.

    You maybe able to source individual gears from a manufacturer and then mate them together to form your compounds.

    You could probably make them yourself or see if someone can make them.

    There is also a 63/60 compound.

  3. #3
    Join Date
    Nov 2005
    Location
    adelaide
    Posts
    597

    Default

    TO quote "To satisfy my unending thirst for new information and partially assuage my uncontrollable urge for verbosity" or what ever that means what do you intend to use those combinations for
    john

  4. #4
    Tiptoeturtle Guest

    Default

    Quote Originally Posted by pipeclay View Post
    Don't think you will find those compounds too easily as 2nd hand units.

    You maybe able to source individual gears from a manufacturer and then mate them together to form your compounds.

    You could probably make them yourself or see if someone can make them.

    There is also a 63/60 compound.
    Thanks for adding the 63/60. I agree I do not expect to find 27/18 or 90/18 in a short time secondhand.

    For the question about use:

    The usual selection of compound gears do not have 1.5:1 (i.e. 27/18) or 5:1 (i.e. 90/18) teeth ratios, I would rather have these options than not have them when it comes to machining a (worm gear ?) mechanism for moving small neodymium magnets on synchronised conveyor systems (for model railways).

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