Results 1 to 7 of 7

Thread: Forming Acetal gears.

  1. #1
    Join Date
    Apr 2009
    Location
    Ashburton, near Christchurch New Zealand
    Posts
    4,994

    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
    Posts
    2,007

    Default

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

  3. #3
    Join Date
    Mar 2005
    Location
    Oroville, WA
    Posts
    10,753

    Default

    So, would that be hobbing or forming?

  4. #4
    Join Date
    Aug 2009
    Location
    Canada, Bc
    Posts
    7,552

    Default

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

    Nice job.

  5. #5
    Join Date
    Apr 2009
    Location
    Ashburton, near Christchurch New Zealand
    Posts
    4,994

    Default

    Yes, obviously the technique needs a bit more development!

  6. #6
    Join Date
    Dec 2008
    Location
    Kendal, On
    Posts
    318

    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?
    .
    "Opportunity is missed by most people because it is dressed in overalls and looks like work." Thomas Edison

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •