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  1. #1
    Join Date
    Sep 2008
    Location
    Narrabeen, Sydney NSW Australia
    Posts
    101

    Default Nifty thread cutting technique

    I thought it was going to be something complex or complicated - the DOC is pretty impressive by itself
    https://www.youtube.com/watch?v=CCDP6SFB2Io

    Just doing the math on this and for those with more discrete dials, perhaps metric, and smaller machines taking less material per pass setting a ratio of 10:5.6 or 100:56 on infeed versus compound feed yields 29.24 degrees.

    So if I was taking 0.25mm cuts I'd advance the compound 0.14 - it also makes it easier as my compound leadscrew has a lot of free play as it is currently, I'd only need to be advancing it, not in and back out, then back in with the occasional overshoot...then rinse repeat

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

    Default

    That type of method is nothing new.

  3. #3
    Join Date
    Sep 2008
    Location
    Narrabeen, Sydney NSW Australia
    Posts
    101

    Default

    I'm on a learning curve

  4. #4
    Join Date
    Dec 2007
    Location
    Adelaide
    Posts
    574

    Default

    It's not a bad idea, that had never occurred to me - same overall result as setting the topslide over 30deg.

  5. #5
    Join Date
    Mar 2013
    Location
    Mt Pleasant SA
    Posts
    126

    Default

    It'a cultural thing, the Yanks use the angled topslide. Poms/Oz use/d the topslide feed method, that's how it was taught 60+ years ago. The angled topslide (compound) method really only took on here since the Internet. Personally I've never bothered with the Yankee method. Couldn't be bothered watching the Youtube, too wordy for me, maybe he did the last 'spring cuts' without further adjustment of the topslide ? that's how we did/do it, so that both flanks of the accurately ground tool define the finished thread.

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