High speed parting blades--why? - Page 5
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  1. #81
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    Quote Originally Posted by DennisCA View Post
    I got a HSS parting blade holder with my lathe, when the single HSS blade broke I bought a 2mm cheap replacement as a quick fix. Still going on that quick fix, a real POS it is, but after some fettling and my own grinding of the carbide inserts it works fine. There's an ISCAR model I want to get once I wear out all the inserts I got for this one.

    Here's the original, weird swedish spring loaded contraption:
    Y'all only parting bored and tubing?

    How TF do you part even a mere 4" solid with a rig like that?

  2. #82
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    Quote Originally Posted by Trueturning View Post
    Silly. No wonder you want to be taught you like to cut up in class when you should be learning.
    No cutting up here.

    YouTube

    And yes, I have my own desk. It's a mess right now, but it's mine.

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  4. #83
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    Quote Originally Posted by TeachMePlease View Post
    No cutting up here.

    YouTube

    And yes, I have my own desk. It's a mess right now, but it's mine.
    Cool. You have access to this? It is pretty cool. I am not much surprised. Bet is is a nitch / special use requirement.

  5. #84
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    Quote Originally Posted by Trueturning View Post
    Cool. You have access to this? It is pretty cool. I am not much surprised. Bet is is a nitch / special use requirement.
    All I can say is that they do really, really neat things with them, and they can greatly reduce downstream operations when applied effectively. They can remove the need for secondary EDM operations, for example.

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    Quote Originally Posted by MattiJ View Post
    Story I have heard is that Germans jumped on the tungsten carbide tooling lot faster as they saw it as a more efficient way to use the limited tungsten supply.
    And Americans went to molybdenium-HSS instead of tungsten-HSS.

    At least we don't have uranium-alloyed HSS anymore
    Tungsten-alloys yes, Carbides not as much. Tungsten was in use as an alloying element in HSS from earliest days. Yah can stretch a modest mass of it a lot further that way than making into fragile carbides. Many, many MILES further.

    See "T1" class.

    ISTR Allegheny's "Cobra" that I am beloved of is a primitive "T1". And stands shock of corn-cob weld cutback really well. See also T4, T8 and T15.

    Cobalt got into the act too. With Molybdenum, not just with Tungsten.
    See Haynes. Stellite, and Kennametal, nowadays, "Mo-Max' for "the other guys" as well.

    A good general overview survives here:

    Crucible Tool Steel and Specialty Alloy General Information

    Google has a hard time finding "Tatung-G". Seems to be an Asian cookware brand now?



    But.. thanks to another PM member? "I got MINE!"

    USA used "all of the above". And more. We HAD them. Richest economy on-planet, 1871 to present-day. "Free Enterprise" thing.

    Weird-Adolph had ever gotten a decent education or left an area the size of Pennsylvania for more than a few times or short miles?

    Damned fool might never have suicided a nation so small and weak to begin with.
    "Slave labour" doesn't really work all that well.


  7. #86
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    Quote Originally Posted by Kevin T View Post
    I got this with my lathe when I bought it and it is a superb shape for parting 1018 steel....on sssssslllllooooowwwww backgear operations. How slow?

    30 RPM from 2.0 OD down to about 1.0 and then bumped up to 50 RPM to finish. (Edited speeds)

    Auto feed = YES

    Feed rate = .0013 per revolution at 2.0 dia. and finish on .0023


    Attachment 289848

    Attachment 289849

    Attachment 289850
    that goose neck is so massive i doubt it has any effect.

  8. #87
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    Quote Originally Posted by thermite View Post
    Google has a hard time finding "Tatung-G". Seems to be an Asian cookware brand now?

    Do you mean Tantung G?

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    Quote Originally Posted by TeachMePlease View Post
    All I can say is that they do really, really neat things with them, and they can greatly reduce downstream operations when applied effectively. They can remove the need for secondary EDM operations, for example.
    Dems have got to be cheap-er

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    I used to grind/make satellite parting blades. They were about 1 1/2" tall and perhaps 12 " long. Forget now who was the buyer, but they bought a lot of them...Stellate was tooted to last 3 or 4 times longer that HSS. It is a non-magnetic material. So long ago I forget how they were to grind.

    Yes made parting blades of carbide and HSS also.
    Never had a problem using HSS on a manual lathe.

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  13. #90
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    I use a plain HSS flat top tapered blade, always use power feed. Haven't had a blade grab or break in years. I feed it plenty of cutting oil as it cuts.

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    Quote Originally Posted by richard newman View Post
    Do you mean Tantung G?
    F**k me..!

    Old age and .... shudda walked over and LOOKED at it.. markings are right ON some of it, yet! "Virgin" blanks, even!

    Thanks!


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    Quote Originally Posted by michiganbuck View Post
    ..So long ago I forget how ^^^ dreadful TEDIOUS ^^^ they were to grind.
    There. Fixed that for yah. I can't casually recall anything quite as contrarian as to slowing down a "shaping" grind. Touch-up ain't so bad, of course.

    Last longer? Meahhhh... most of my choices of HSS-Cobalt / Stellite historically had to do with what stage of corn-cob weld cutback was at the tip. Job Shop, "rebuild" isn't going for multi-unit throughput, what with every task a "onsie".

    "Cobra" T1 for early pass. it could finish a loooong cut with least loss to impact damage.

    Two of the "Mo-Max" tribe - damned if I even remmber which two of many. Wotever they stocked. 'til cut was no longer interripted. They went to s**t, but re-ground quickly enough.

    Reg-95 for finish. Easier to put a right razor of an edge on it. That would STAY there. For a while.

    But.. but .. but .. most of us as have any "pre-carbide dominance days" mileage on HSS?

    We only had a TINY subset of the universe to choose from.

    Company decision as to what was in the toolroom. We had no real say as to what went on that menu.

    And then we had built-up our "habits" right, wrong, or sideways.

    Forums like PM (nor even the internet) where we might have exchanged curious inquiries, or "try this, it works better" didn't even exist, 50 and more years ago. Stop for a round of beer on the way home? Ga-ron-tee "HSS tooling" was NOT what we were talking about!

    Still have my "habits", of course.

    Right, wrong, or sideways!

    Mind... nobody ELSE on PM has any such problem.

    Y'all are fully open-minded saints without the least lick of "bias" .... aintcha?


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    Some home shop types plasma cut a old carbide tipped wood saw blade and use the single tooth and blade segment as a parting tool.
    Bill D

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    Quote Originally Posted by Bill D View Post
    Some home shop types plasma cut a old carbide tipped wood saw blade and use the single tooth and blade segment as a parting tool.
    Bill D
    Good grief.. what a HUGE savings in materiel, time, money, enhanced safety..F**k-with time!

    NOT!

    Must be the same "home shop types" as figured piercing corrugated steel plate for tie-wires to make sheet-steel and Earth-fill aircraft revetments would be faster and cheaper with 5.56 NATO "penetrator core" ammunition, point-blank, than an Ox-Acetylene cutting torch.

    I kid you not.

    Army and Marines "know about" the jacket frags as a round comes apart on-target.

    Poor Air Force lads were only taught how to hit a target, their primary "battle rifle" being many tons of something called an "A4 Phantom" as was to be the beneficiary of said revetments.

    ISTR the shrapnel sent 3 or 4 of 'em off to hospital - wounds, only, thankfully - before the shit hit the fan with a "JUST DON'T DO THIS SHIT" broadcast from "on high".

    Might be worth repeating over fifty years on?

    "Just don't doo this shit!"

    A straight, thick, power HACKSAW blade has watcha might call "integrity"

    A round WOOD saw blade, thinned section of its disc not unusual, then built to a price with brazed Cardides?

    All TF it OWNS is a share of the "American Disease".....

    "cheaper-than"


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    Quote Originally Posted by michiganbuck View Post
    I used to grind/make satellite parting blades. They were about 1 1/2" tall and perhaps 12 " long. Forget now who was the buyer, but they bought a lot of them...Stellate was tooted to last 3 or 4 times longer that HSS. It is a non-magnetic material. So long ago I forget how they were to grind.

    Yes made parting blades of carbide and HSS also.
    Never had a problem using HSS on a manual lathe.
    Pretty cool there Buck. I wonder what the satellite was as far as steel. It is hard to imagine what it could have been.

  19. #96
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    Quote Originally Posted by Bill D View Post
    Some home shop types plasma cut a old carbide tipped wood saw blade and use the single tooth and blade segment as a parting tool.
    Bill D
    Lol. Creative .

  20. #97
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    Quote Originally Posted by Trueturning View Post
    Pretty cool there Buck. I wonder what the satellite was as far as steel. It is hard to imagine what it could have been.
    You don't HAVE to "imagine". Look it up. Or buy some and try it. Or just watch the movie?

    Tantung Cutting Tools

    Think I'm at some sort of "disadvantage" for not pissing-away money on inserted Carbides in a ZERO repeat-unit nor "volume production" environment?

    Not really, I ain't. Right grand goods to have for a one-off shop, the Old Skewl alloys.

    Stone age didn't end for lack of stone, Bronze age didn't end for lack of Bronze, Iron Age didn't end for lack of Iron.

    High speed steels and no-real Iron IN 'em, so not technically "steel" at any speed are still made and used, all over the place, present day and future-for-sure.

    Looked-up M-42 out of a Chinese mill, onct. Six month lead time.

    OTOH? Their minimum order was for a hundred metric TONS at a go!

    Gave it a miss... not keen on Chinese metals to begin with...


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    Ya know what my parting off tool is at the moment?

    A 1920's Starrett hacksaw. The one with the straight wooden handle
    (very comfortable, BTW)
    Loaded with a "red stripe" HSS blade. 18TPI.

    Waiting on a new toolpost/holders to arrive,
    THEN I will have power parting off.

    BTW the Starrett blades eat thru 2" hot roll easily enough to use the old arm strong method with no issues.. Former smoker/drinker (I Quit) in my 50's. So its not like I'm in the best shape, the starrett blades make up for that. Best I've ever used.

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    I've had the same HHS parting blade in the Aloris holder for the Mazak ACE for over 5 years. I part a piece or two every month I pet.

    Alu, bronze or steel Same tool.
    I do dust off the edge from time to time.

    Power feed, brush lube, and I prefer to bore a hollow part to make the drop.

    I've never "needed" anything different, (though I have insert parting tools in the drawer) , 'just don't want to order and inventory another insert,

    PS

    If parting work was any easier.... I just don't know what I would do with myself. I would feel guilty for charging time for the operation ;-)

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    Quote Originally Posted by CalG View Post
    If parting work was any easier.... I just don't know what I would do with myself. I would feel guilty for charging time for the operation ;-)
    You CHARGE for s**t? At ALL?

    How TF?

    I thot you were operating in Bernie-Bro "free everything" turf?



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