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  1. #31
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    Default New Lathe

    Quote Originally Posted by Pete F View Post
    Bryan, did you try it with copious amounts of lube as suggested? I find as soon as the cut begins to dry out I'll start to get early signs of chatter when parting. When I get plenty of lube in there the pre-chatter stops and it will slice off no problem at all. I think I mentioned previously that I currently use Tapmagic and a few drops consistently dripping in does the trick. For this very reason, on my new lathe I intend running pure cutting oil. Soluble coolant would possibly be better, and I'm sure it's no coincidence it's used so much in industry, however I have various reasons not to go down that path. Inserts are expensive and you shouldn't be damaging them each time you part something off.

    Pete
    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

  2. #32
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    May 2010
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    Lower Lakes SA
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    Quote Originally Posted by Pete F View Post
    Bryan, did you try it with copious amounts of lube as suggested? I find as soon as the cut begins to dry out I'll start to get early signs of chatter when parting. When I get plenty of lube in there the pre-chatter stops and it will slice off no problem at all. I think I mentioned previously that I currently use Tapmagic and a few drops consistently dripping in does the trick. For this very reason, on my new lathe I intend running pure cutting oil. Soluble coolant would possibly be better, and I'm sure it's no coincidence it's used so much in industry, however I have various reasons not to go down that path. Inserts are expensive and you shouldn't be damaging them each time you part something off.

    Pete
    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

  3. #33
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    Quote Originally Posted by Bryan View Post
    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.
    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.

  4. #34
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    Ballina, NSW
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    Default

    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

  5. #35
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    Default Parting Off in Lathe

    Quote Originally Posted by WelderMick View Post
    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
    Mick
    Thanks for that reference.
    The videos give a very good insight into the details of parting off.
    A little while back on this forum there were some blokes having difficulty with parting off. These videos address those problems,& are worth viewing.
    regards
    Bruce

  6. #36
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    Quote Originally Posted by Gavin Newman View Post
    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.
    Gavin, I ground a similar groove on my HSS blade and it helped a lot.

    (oil discussion moved)

  7. #37
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    Oct 2007
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    muswellbrook
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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!

  8. #38
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    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

  9. #39
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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?

  10. #40
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    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

  11. #41
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    hands up everyone who thinks Ray deserves a new squirt bottle

  12. #42
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    Quote Originally Posted by WelderMick View Post
    hands up everyone who thinks Ray deserves a new squirt bottle
    Thanks Mick, I'll put my hand up for that...

  13. #43
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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.

  14. #44
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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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