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19th Mar 2014, 08:34 AM #16Most Valued Member
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I see you are right at the chuck so it should have worked ???..wonder why it didnt..we need lessons eh?..or trial n error times
I was about 3-1/2 in away on 1/2 dia when I was doing it...certainly not in any way semi rigid even with a live centre I'd say. I am taking all this in for when I need to do it again.
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19th Mar 2014, 08:35 AM #17Most Valued Member
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19th Mar 2014, 08:39 AM #18Most Valued Member
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19th Mar 2014, 08:54 AM #19
Hi David,
I have never considered the problems with using a center, but it makes perfect sense.
I have used the traveling steady to good effect when i have wanted to part further from the chuck. I think on smaller lathes though you are asking for extra problems with carbide, i would just use HSS on a lighter, less rigid machine.
The eccentric one is exactly that, an upside down one that you use in your normal toolpost with the lathe in reverse. Not good for screwed spindle noses though.
As far as speed goes, I tend to keep it fairly low, 400rpm is a nice starting point. On the Antrac i will go to 720 once the dia drops but no faster. I am currently using a 4mm wide Iscar tool. I had a 2mm but the tips just kept breaking on the bigger lathe.
Andre and i were discussing surface speeds when he was down a few months ago. He was saying that at work they use carbide but part really slowly, 200rpm comes into my mind. Not sure on the job sizes though.
For fast parting check this out: https://www.youtube.com/watch?v=YYs-Q1FQ-q8
If you can get past the fact that its a bit of square in a 3 jaw it pretty amazing.....
Ew1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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19th Mar 2014, 02:29 PM #20Golden Member
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- Apr 2009
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- Ballina N.S.W.
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- 644
Hi eskimo
My rear parting tool is one I made up myself. The Eccentric Engineering ones would work as well the principle is the same. I just felt having one mounted ready to go saves a bit of time, I always seem to need to part off most jobs. I run my lathe at 500-700 RPM when parting 25mm dia steel. For 50mm dia around 350RPM both with power feed on slowest setting and plenty of lubrication-see pictures. Part as close to the chuck as possible.That guy in the video parting a square bar held in a three jaw chuck is looking for trouble that would not be far away.
Bob
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