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Thread: Forming Acetal gears.

  1. #1
    Join Date
    Apr 2009
    Location
    Ashburton, near Christchurch New Zealand
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    Default Forming Acetal gears.

    Some weeks ago I showed how I had heat formed some lightweight ABS gears and Evan tried the same with Acetal. If I recall correctly, Evan tried heating the blank but the forming failed.

    Now that I have some black plastic which is probably not Acetal but I tried it anyway. It is much harder than the ABS was and there was no sign of it forming without added head.

    This time I put the blank on an arbor in the chuck and mounted the steel gear on the tool post, I pressed the gear against the rotating blank which started the familiar rumbling sound then I put my heat gun to the edge of the gear and when the rumbling eased I advanced the feed and repeated until the teeth were formed at full depth. Success!

    Well formed teeth that appear to be full strength but I can not get rid of the hairy edges!


  2. #2
    Join Date
    Oct 2009
    Location
    Louisville, KY
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    Default

    Load the 'hairy' gear with grease and proclaim victory.

  3. #3
    Join Date
    Mar 2005
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    Oroville, WA
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    Default

    So, would that be hobbing or forming?

  4. #4
    Join Date
    Aug 2009
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    Canada, Bc
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    9,096

    Default

    Yea, Call the hairs 'Oil wicking surface' or something

    Nice job.

  5. #5
    Join Date
    Apr 2009
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    Ashburton, near Christchurch New Zealand
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    Default

    Yes, obviously the technique needs a bit more development!

  6. #6
    Join Date
    Dec 2008
    Location
    Kendal, On
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    547

    Default

    Quote Originally Posted by dp
    So, would that be hobbing or forming?
    fobbing, or horming

  7. #7

    Default

    Would the hairy gears and unusual technique make this guerilla or gorilla machining then?
    .
    "I am often asked how radio works. Well, you see, wire telegraphy is like a very long cat. You yank his tail in New York and he meows in Los Angeles. Do you understand this? Now, radio is exactly the same, except that there is no cat." : Albert Einstein

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