Originally Posted by
Pete F
G'day Chris, mate I'm honestly a little over having to fight to get everything over the line here with you. I'm not interested in arguing with you every single time a subject comes up. In this case I suggested you go out with a triangular shaped tool, and run the tool both ways to see how that makes a difference to the work deflecting. I encouraged you not to believe or trust what I say, nor what the World's largest insert manufacturer says, and instead prove it for yourself. Once you see it you will understand what's behind it. You instead dragged out your calculator. Your choice, but I'm a bit over it to be perfectly honest.
Likewise if you don't understand that chatter can be caused by the either the tool deflecting or the work deflecting, then I really have nothing more to say, that's just basic lathe work. I stated that I was testing those tools based on what I was doing, not what the OP was doing, and at the 3 mm work I was doing things like work deflection really are a big deal and it's plain to see it with by eye. I thought I'd just share what I found for the benefit of others. I then stated that it may not be such a problem with larger diameter work, never the less, with long overhangs and thin pieces, yes the work can still be deflected. On ANY lathe :rolleyes: Anyone who has done really close tolerance work would have struck that already, and I'm frankly surprised that a person of your experience haven't seen this and instead tries to claim it doesn't courtesy of a calculator.
You're entirely free to do with your life as you please. But I'd respectfully suggest that there is no substitute for actually doing this work, and not just punching numbers in to calculators and looking things up on Google. While you were punching numbers I was bringing 3 mm shafts up to better than spec, as they turned out to need to be 2.97 and I got worst case of 2.95 mm. But hey, I guess what would I know.