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  • Solid Carbide Parting Blade

    From Bob La Londe@21:1/5 to All on Sat Mar 19 14:48:19 2022
    I've never been thrilled with the performance of HSS parting blades.
    Carbide inserts are decent, but the insert holders tend to be the
    failure point. I have scrap carbide. I could make a sort of angled
    boring bar holder to go on the quick change tool post, and then grind
    scrap carbide to shape. Front and side relief could be ground in, and
    then the holder takes care of top relief. I don't know. This is just
    one of those thoughts that no doubt kept me out of the good schools.


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  • From James Waldby@21:1/5 to Bob La Londe on Sun Mar 27 20:47:34 2022
    Bob La Londe <none@none.com99> wrote:
    I've never been thrilled with the performance of HSS parting blades.
    Carbide inserts are decent, but the insert holders tend to be the
    failure point. I have scrap carbide. I could make a sort of angled
    boring bar holder to go on the quick change tool post, and then grind
    scrap carbide to shape. Front and side relief could be ground in, and
    then the holder takes care of top relief. I don't know. This is just
    one of those thoughts that no doubt kept me out of the good schools.

    From the above I'm assuming your piece of ground carbide wouldn't look
    exactly like the usual carbide grooving/parting inserts, or maybe the
    holder wouldn't just have a slot the carbide slides into. Or would it
    look like a fairly ordinary insert and bar arrangement, just beefier?

    Re the diameter you could part, would the stickout of the carbide
    piece be the limiting factor, or would your holder be as thin as the
    carbide?

    Also, when you shop grind a carbide bit, does it stay sharp as long as
    a factory ground insert does?

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  • From Bob La Londe@21:1/5 to James Waldby on Sun Mar 27 17:03:09 2022
    On 3/27/2022 1:47 PM, James Waldby wrote:
    Bob La Londe <none@none.com99> wrote:
    I've never been thrilled with the performance of HSS parting blades.
    Carbide inserts are decent, but the insert holders tend to be the
    failure point. I have scrap carbide. I could make a sort of angled
    boring bar holder to go on the quick change tool post, and then grind
    scrap carbide to shape. Front and side relief could be ground in, and
    then the holder takes care of top relief. I don't know. This is just
    one of those thoughts that no doubt kept me out of the good schools.

    From the above I'm assuming your piece of ground carbide wouldn't look exactly like the usual carbide grooving/parting inserts, or maybe the
    holder wouldn't just have a slot the carbide slides into. Or would it
    look like a fairly ordinary insert and bar arrangement, just beefier?

    Re the diameter you could part, would the stickout of the carbide
    piece be the limiting factor, or would your holder be as thin as the
    carbide?

    Also, when you shop grind a carbide bit, does it stay sharp as long as
    a factory ground insert does?


    Nope. It would look like a parting blade carved out of a broken end
    mill, and the remaining round stub would lock into a holder. How long
    the edge lasts? I don't know. Most of my one off shop made carbide
    tools get used for one job, and then they go in a drawer where I will
    never remember what I made that tool for ever again.


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