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Thread: Parting Tool

  1. #61
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    Quote Originally Posted by thermite View Post
    Yah, surely. "Slightly BELOW center", load comes on, tool-tip drops a skosh MORE.. and the work sucks the backlash right outta the leadscrew & nut on the cross and you gets a nasty crash, too.
    Funny, I did 8 of them today and it worked perfectly. But, what do I know?

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    Quote Originally Posted by steve45 View Post
    Funny, I did 8 of them today and it worked perfectly. But, what do I know?
    So far? A good deal less than you will COME to know!



    Patience, Cock E. Grass-Hopper Jr.

    I din't invent the problem. It just growed.

    In-place easily a hundred years before ever I even walked in the door. That cudda been a Monday. But it weren't LAST Monday.

    Just ask the grown-ups about parting-tool crashes. Lotta scars on a lotta ashes.

    I'd actually class it more of a challenge than single-point threading.
    Everything is working WITH you and FOR you cutting threads. Might even be taking more than one pass?

    Parting-off? The change in SFM alone is a Royal Bitch Kitty as you drive towards the center of a solid steel part in any significant diameter.

    You were starting at what? Only six or eight inches?

    Or maybe not-so-much?

    And was it even steel?

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    Quote Originally Posted by CarbideBob View Post
    Honing here I will take a some sort of sharpening?
    Honing to a cutting tool maker is a radius on the cutting edge. Sort of dulling it. Comes in many sizes and flavors.
    Pure rad, waterfall, tapered rad, combos...

    I do know many say hone mean to up sharp edge but to me is asked for it is a radius or dulled. We grind it sharp and then hone it if needed.
    Is the original grind not sharp?
    Are you putting a better use on the top with a stone? If so is the actual edge or the top tool surface that gives better results?
    Bob
    Thank you for clarifying the terminology Bob, yes, I’m using it incorrectly. In responding to the thread regarding HSS parting blade sharpening, I’m referring to “finishing pass(s) on the sharpening grind”, I think!

    In the case of using a carbide “general purpose” steel insert on aluminum, I’m “reducing the hone radius” I guess?

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    Quote Originally Posted by cyanidekid View Post
    Thank you for clarifying the terminology Bob, yes, I’m using it incorrectly. In responding to the thread regarding HSS parting blade sharpening, I’m referring to “finishing pass(s) on the sharpening grind”, I think!
    More to it. HSS/Cobalt loses it "bleeding edge" fast due to "nano cracking" breakdown, then avalanche as that worsens it's overall situation and stresses go up.

    Get YOUR edges done nicer than the next Pilgrim does HIS, you'll move metal more cleanly, at a skosh less HP and stress to the work, stop to swap and resharpen less often, complete the tasking faster and better - and even on "challenging" machines.

    Carbides are somebody else's bag, but quality attention to finer details still counts.

    And probably by more than ever, the "bar" for what is expected- nay taken as "GIVEN" - having been raised by a LOT vs up-to-each-hand's-skills, "variations unavoidable"... HSS/Cobalt as well.

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    This thread highlights the hypocrisy of those PMers who insist on the fiction that PM is only for pro machinists.

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    Quote Originally Posted by metalmagpie View Post
    This thread highlights the hypocrisy of those PMers who insist on the fiction that PM is only for pro machinists.
    Rather a dull life if even a person 50 years at the tool-tip were to be only and ever no MORE than "just" a "professional" machinist, yah?

    A true "professional" is ANYONE... who is always at THEIR best.

    Regardless.


    Humans are just wired that way. We find a dozen ways - or a dozen-dozen - to do whatever we WANT to do if we want to .. strongly enough. Or have no other option?

    Or even just by accident? As a by-product? Or for the pure Hell of.. or casual amusement in it?

    You'd have to know "humans"? Ever-clever buggers. It's what we do. "Man", all forty-leven sexes, is a tool making animal. And a fool teasing one as well.

    Even if the rudely independent f****s scare the living shit out of you half the time?

    Welll.. MORE than half.

    Women also live longer...

    Machine-tools are cheaper to divorce as well.

    Izzat why we are REALLY all here, together ... in common-cause?

    Don't ANYONE dare answer that!

    Joe Buyed-in only has but a modest-sized battery-pack for what it takes to fake walking and talking and signing whatever is put under his autopen.

    So "for the time being", we still have the Constitutional right against self incineration!


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    Quote Originally Posted by metalmagpie View Post
    This thread highlights the hypocrisy of those PMers who insist on the fiction that PM is only for pro machinists.
    Amazing !

    I went back thru all (3) pages, and not one post from you offering help.

    Simply Fooking Amazing.....

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    Quote Originally Posted by digger doug View Post
    Amazing !

    I went back thru all (3) pages, and not one post from you offering help.

    Simply Fooking Amazing.....
    Ermmm.. Nooooo. It isn't even CLOSE to "amazing".

    "Normal", rather.

    Kibitzer – Yiddish Warmth

    "let he who is without an internet connection cast the LAST stone", isn't it?

    "It's PM. Dammit!"

    Could as easily have been "kibitzer.org".

    Too slow!

    I just registered it!


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    Thank You Guys for all the Guideness...I have allot to absorb here on what will be my next step in my learning process...
    For all of YOU that has given constructive help and helping to point me in a direction My Hats Off To You...THANK YOU

    Perhaps we need to close out this topic before it gets any more convoluted...
    I'm sure I will have more to follow but in the mean time I have a wealth of information to try and go forth with...
    Looking forward to trying allot of your suggestions and from time to time I'll post or PM and let you guys know how the process is going...
    Thanks Once Again
    Paul

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    Thank you, guys! I registered here to find these answers!)

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    Quote Originally Posted by JohnM20 View Post
    Thank you, guys! I registered here to find these answers!)
    It's generally easier on your mental health plan billing if you just "lurk", actually.

    "PM" is sort of a "stone soup" party.

    Everybody brings whatever they HAVE.

    Cooks stir the pot. Sometimes with their dicks.

    Even so, nobody has to go away hungry.

    It's only when you get copper Levi's rivits, shreds of denim, soles or toe caps off steal-toad boots in your stew bowl that you realize some poor bastard "gave his all" ....and got sucked into the recycled Iowa-Class propellor blades PM uses to homogenize the soup.

    No fear.

    Just put a seat belt on the swivel chair in front of your keyboard and hang on for the ride.

    "Airbags" will NOT save your ass.

    They all work for the casino.

    What did you THINK it took to spin an Iowa-class prop shaft?


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    One thing I do with HSS blade is use a chainsaw sharpening stone and form a lengthwise concavity on top of the blade. It rolls the chip so it does not jam in the cut. Other ssay use a much bigger diameter grinding wheel.
    Bill D

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    Quote Originally Posted by Bill D View Post
    One thing I do with HSS blade is use a chainsaw sharpening stone and form a lengthwise concavity on top of the blade. It rolls the chip so it does not jam in the cut. Other ssay use a much bigger diameter grinding wheel.
    Bill D
    The store-bought HSS I use ships that way. Tee rib top, already concave ground the whole length.

    An easier and more universal trick is to Vee the vertical front "fishtail" some call it. The combo splits and weakens the chip, curls it into less than the cut width so it doesn't scour the sides nor jam-up.

    Step grinding two or three staggered edges at the front on the wider tools for larger work acts in the same way.

    Absent the vertical near-zero deflection, though?

    Nothing works as well as it could do.

    Stiffness is the most important "part of parting."


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