I like the way you made the lathe dog. Great observation about the lack of chatter when using HSS vs. carbide (insert?) when machining the thin long taper. There are a lot of factors involved so hard to know the root cause but I like the true slicing action of HSS vs. plowing action of carbide inserts. On slim parts the carbide insert tends to plow in (and out) and flex the part which start a standing wave harmonic motion causing chatter. To make matters worst is the varying diameter along the length changes the parameters so you probably can't find an ideal combination of speed, feed, DOC and lubrication. The sharply hone HSS or cobalt HSS is your best bet.
Thanks for sharing,
Thanks Brian. Like both your Lathe Dogs. Simple, quick design but a bit hair raising fab on the metal one. As for the chatter in the middle; It could be a lot of things like Paul indicated and agree about the HSS or Cobalt. What I noticed was your tool grind didn't have much of a radius nor back rake. I have found on CRS to give a bit more radius and cock the QCTP back a bit to move to about ~3-5º into the radius tends to pull the chips a bit better and adding a shallow back rake allows them break a bit sooner.
CRS has always been tough for me on the Peanut and gone through a lot of iterations to get it the best I can. Mr. Pete had a video a while back about finish passes using a for difficult to machine materials. It's only for final passes of a thou or two but works like a champ and uses a lot less elbow grease than lots of grits of paper to get a finish like this tool needs.
Thanks for sharing and treats for Zeke! ~PJ
**Not sure why the YT videos are now embedding rather than just being a link??
Last edited by PJs; 04-06-2016 at 11:09 AM. Reason: Embedded video instead of link??
‘‘Always do right. This will gratify some people and astonish the rest.’’
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