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Thread: Nifty thread cutting technique
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27th Mar 2024, 11:43 AM #1Senior Member
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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
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27th Mar 2024, 04:35 PM #2Most Valued Member
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That type of method is nothing new.
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27th Mar 2024, 05:49 PM #3Senior Member
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I'm on a learning curve
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28th Mar 2024, 11:16 AM #4Golden Member
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It's not a bad idea, that had never occurred to me - same overall result as setting the topslide over 30deg.
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28th Mar 2024, 08:27 PM #5Senior Member
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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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