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Thread: Carbide Parting Tool
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26th Oct 2011, 10:49 PM #31Diamond Member
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New Lathe
I read that you have purchased a new Hercus 260 on your overseas trip.
When you get it installed, I would like to see it,as I am a bit of a Hercus "nut" myself.
Please lets know,when convenient, we have been talking about meeting up soon, & you are only 20mins away. Also want to try some of that Kasenite for case hardening, some small machined items.
regards
Bruce
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26th Oct 2011, 11:23 PM #32Distracted Member
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Pete, no I didn't. Reason is the only cutting oil I have on hand is the Trefolex spray can and I don't like the way it smokes when hot. It's unpleasant and apparently unhealthy. I would like to hear about any neat cutting oil products that don't smoke or fume. I will be interested to hear how you go with your new setup. I have the full coolant system that I could run on oil if it's worth it. Meanwhile I seem to be getting acceptable results dry. Chatter is no longer an issue, and with the right speed/feed combo the inserts are holding up well (so far).
BTW, I should just add that these inserts (MGMN) are not actually listed by Korloy as a specialised parting insert, but a 'multi grooving, turning' insert. There are some dedicated for parting that I might look into when the time comes. They are called MGMR. More details in the pdf I posted earlier.Last edited by Bryan; 26th Oct 2011 at 11:32 PM. Reason: Added insert numbers
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27th Oct 2011, 07:17 AM #33
Bryan
I have good results with Fuchs Ratak S oil, it smokes a bit but I have set up a number of computer muffin fans on the splash back near the chuck to extract the fumes away from me. My parting inserts have a longitudinal groove that folds the chip in on itself so it doesn't pack in the kerf.
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27th Oct 2011, 08:39 AM #34Golden Member
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This guy: mrpete222's Channel - YouTube has got some videos, not sure why I watch them, I don't even have lathe . Anyway, even though its pretty basic (and probably below the skill level of this discussion), if you haven't seen these videos they're worth a look. His videos that he's labelled #35 and #36 are about parting off. Cheers - Mick
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27th Oct 2011, 10:17 AM #35Diamond Member
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Parting Off in Lathe
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27th Oct 2011, 10:35 AM #36Distracted Member
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27th Oct 2011, 11:37 AM #37New Member
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I think it was a takang lathe, 600 swing and 1800 cts? The only reason that I would part off above center is with the high feed rate that I use. Its usually about 5 or 10 thou. I must admit that when I first started to part off I was a little standoffish, but when you have to part off 20 or 100 thick spacers you soon push the tips to the limit. Also where I was working it wasn't a cost thing it was a time thing so inserts and longevity didn't matter too much. The smaller the diameter the more finiky your settings have to be. We all know about speeds and feeds, but changes in the angles as the diameter changes also occours. The tighter the radius and the more off center the tip the cutting angle changes dramatically and pulls your tip into the job!
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27th Oct 2011, 06:46 PM #38
Hi Bryan,
This isn't exactly what you would call high speed parting off, I was making some spacers for the bench grinder, and thought I'd try taking a video of the parting off, maybe there is something there that helps. I tried Lanox as a cutting lubricant, normally I use a soluble oil. But after reading on the Lanox website that it can be used as a cutting lubricant I thought it might be worth a try.
[ame="http://www.youtube.com/watch?v=embXUTrcTNw"]Parting off with Carbide Inserts - YouTube[/ame]
Speed was 250 rpm, and hand feed, (that's why the one handed camera work is a bit dodgy)
Possibly a candidate for the most boring video of the week...
Regards
Ray
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27th Oct 2011, 08:26 PM #39Distracted Member
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Ray, what was the material and diameter? It certainly seemed to go pretty smoothly, considering how many tasks you were juggling. Better give Santa a hint about a tripod. What's your impression of the Lanox?
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27th Oct 2011, 08:51 PM #40
Hi Bryan,
The material is 50mm bright bar.
I'm still trying the Lanox as a cutting lubricant, so it's early days just yet. It has the advantage of being cheap and multipurpose. I don't expect it will provide as much cooling as water soluble oil mix.
One reason for taking the video, was, I recalled you said (in an earlier post) the swarf was jamming in the cut.. and thought there might be some clues as to what your problem could be, by the way the swarf exits the cut in the video..
Regards
Ray
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27th Oct 2011, 08:56 PM #41Golden Member
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hands up everyone who thinks Ray deserves a new squirt bottle
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27th Oct 2011, 09:41 PM #42
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27th Oct 2011, 10:04 PM #43Distracted Member
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Ray, mine looked a lot like yours, when I got it right. The jamming only happened when I had too much feed for the speed, or too much speed for the dry conditions. That's my take on it anyway.
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28th Oct 2011, 07:35 PM #44Most Valued Member
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Sorry Bryan I missed your reply to me. Well I would definitely go with lubricant. Yes smoking with oil is a bit of an issue, but it's not that bad and you can always decrease the speed.
Nice video Ray, better video work than my efforts under the same circumstances. I'm pretty sure I heard the signs of what I called "pre-chatter" above, at around the 40 second mark? It could just be that Ray has stopped feeding at that point, but otherwise then Bryan this is exactly what I was talking about above. As soon as Ray applies the lubricant then the noise instantly disappears. Personally I would part-off much harder than Ray did in that video, and my lathe is weeny in comparison, but that's just me. More like the thicker cuts he's taking. I don't have power cross feed on this lathe, but my new one does. Just the same I will still expect to be feeding by hand. It's the one operation when I like to see, feel and hear what's happening with the tool.
Pete
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