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  1. #16
    Join Date
    Apr 2018
    Location
    Drouin Vic
    Posts
    633

    Default

    Quote Originally Posted by Com_VC View Post
    Would be a good project for a 3D printer these days.
    The bicycle potter's wheel from which I borrowed the idea for my project had 3D printed bevel gears https://www.youtube.com/watch?v=uHj_BysG4Ww

  2. #17
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Quote Originally Posted by steamingbill View Post
    Hey BaronJ,

    Does that mean that the gears were not machined, but rather they were made by pouring hot metal into a mould ?
    Hi Bill,

    I assume so. Probably secured by a knurl or spline on the shaft. One shaft is plain and used by the drill driving it, and the other has a 3/8" X 24 BSF thread on it that fits the supplied chuck. There isn't any bearings other than those that are part of the cast housing.

    Actually its a quite nice copy of a 3/8" (10 mm) Jacobs keyed chuck ! Which, tongue in cheek, was the reason I bought it.
    I mean where can you get a chuck, with a key, for no more than £4.49... with a right angle drive thrown in.
    Best Regards:
    Baron J.

  3. #18
    Join Date
    Aug 2008
    Location
    Melbourne
    Age
    34
    Posts
    1,075

    Default

    I think powder metallurgy is more likely than a molten cast, it's used quite widely for small gears now.

  4. #19
    Join Date
    Nov 2010
    Location
    Gippsland Victoria
    Posts
    733

    Default Had a go at bevel gears -

    I had a go.

    Made a mess but they do work after a fashion. Learned how to make expanding mandrels along the way. Made a mandrel to hold the chuck on the dividing jig.

    The next pair will be a lot lot better. Will either make or buy a new cutter - some are absurdly cheap nowadays - saw some gearcutters on ebay for only $10ish yesterday.

    Some photos attached.

    The Ivan Law book was very difficult for me to understand - had to read it several times. The notes below and photo, when considered along with the book, may help other folk have a go.

    1. 20 tooth bevel gear needs an 80 division dividing setup. First pass is to cut on every 4th mark - go round the whole blank cut all 20 gaps.

    2. Lower the cutter by the calculated amount and rotate the blank by 1/4 tooth so that the lowered cutter aligns with the gap at thin end of teeth - for me that meant lowering the cutter by 1.1mm and rotating the blank clockwise by 1/4 tooth (1 division) and then going round all the pink marks (see photo) and shaving one edge off of the teeth.

    3. Raise cutter by calculated amount and then go round all the green marks - shaving the other edge of the teeth - see photo

    My blank moved, I forgot to tighten the dividing jig enough or maybe the plate slipped, and the result is you can clearly see that the teeth are skewed on one of the wheels - think I also messed up the centering on the second blank - but they do engage and whirl eachother around - which I thought was fairly surprising given the various mistakes and sloppy end product. https://www.youtube.com/watch?v=16xu...ature=youtu.be - horrible video but proof of gears meshing.

    My cutter wasn't wide enough - at the fat end the teeth ended up much wider than the slots and I had to cut the wheels down to a much smaller diameter to get the slots and teeth lined up properly - this is explained in the book but I took a punt and used my pre-existing cutter and got it wrong.

    Ended up not using the setup in the attached photos - too much overhang/stickout - used an expanding mandrel with the blank mounted as close as possible to the block - the main ideas are still the same.


    Thoroughly enjoyed learning how to do this and will do a far better job next time.
    Attached Images Attached Images
    Last edited by steamingbill; 7th Oct 2018 at 11:08 PM. Reason: added photo 7

  5. #20
    Join Date
    Sep 2006
    Location
    Australind , WA
    Age
    58
    Posts
    1,277

    Default

    Quote Originally Posted by alfclp View Post
    Have you considered using gears from auto differentials?
    What about the final drive from a shaft drive motorcycle?

  6. #21
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
    Posts
    1,894

    Default

    apparently a milling machine and dividing head are not special enough

    Quote Originally Posted by elanjacobs View Post
    Not quite
    A Gleason is no ordinary mill.

  7. #22
    Join Date
    Aug 2008
    Location
    Melbourne
    Age
    34
    Posts
    1,075

    Default

    Quote Originally Posted by nadroj View Post
    A Gleason is no ordinary mill.
    That was my point. An ordinary mill isn't special enough.

  8. #23
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
    Posts
    1,894

    Default

    Quote Originally Posted by elanjacobs View Post
    That was my point. An ordinary mill isn't special enough.
    Righto.

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