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Thread: Best inserts for finishing gummy 1018?

  1. #1
    Join Date
    Dec 2016
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    Helsinki, Finland, Europe
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    Default Best inserts for finishing gummy 1018?

    Lots of carbide inserts work nicely if you can get enough speed, but on a smaller work pieces this is often not possible. So what is your favorite tooling?

    Sharp (dggt, ccgt xxgt) inserts intended for aluminium seem to work pretty well but I have also seen some recommendations for cermets, for example Sumitomo T1500 in sharpened versions like DCGT.

    Just some time a go I decided to give ceramics a try and based on a very quick test I have to say I am impressed. Re-sharpened Kennametal KY1615 seem to work quite nicely.
    Anyone else using ceramic inserts to finish cut soft steels?

    It's the best thing since sliced bread on crappy steel:

  2. #2
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    Looks pretty nice. I will have to try that sometime. Thanks!

  3. #3
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    I am surprised, I thought ceramics were supposed to be run at extremely high speeds, much more than carbide. Never tried them but will keep it in mind now.

    (I like your homemade holder !)

  4. #4
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    Quote Originally Posted by Sparky_NY View Post
    I am surprised, I thought ceramics were supposed to be run at extremely high speeds, much more than carbide. Never tried them but will keep it in mind now.

    (I like your homemade holder !)
    Yeah, that's true at least with hardened steels. I was busy trying my teeth on hard turning so I didn't realize to take a facing cut to see how low SFM the ceramic would actually work with 1018CR. But I guess it has possibly bigger usable SFM area than anything else because the ceramic has very low tendency to "weld" and make build-up-edge with steel.

  5. #5
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    What do you mean "Re-sharpened"? Did you buy them resharpened or sharpen yourself.

  6. #6
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    Quote Originally Posted by Axkiker View Post
    What do you mean "Re-sharpened"? Did you buy them resharpened or sharpen yourself.
    Chipped inserts DIY sharpened. 5$ chinese diamond wheel on a 15$ bench grinder saves the purchase cost on the first sharpening
    Finish honed real hastily on a 2-5micron diamond lapping compound.

  7. #7
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    Jun 2014
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    Quote Originally Posted by MattiJ View Post
    Chipped inserts DIY sharpened. 5$ chinese diamond wheel on a 15$ bench grinder saves the purchase cost on the first sharpening
    Finish honed real hastily on a 2-5micron diamond lapping compound.
    Ahhhh makes sense.

  8. #8
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    Sep 2013
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    Ahhhh, The joy of HSS! So easily shaped and sharpened. ;-

  9. #9
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    I thought we were talking about ceramic inserts?

  10. #10
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    Oct 2012
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    Walla Walla WA, USA
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    I've found CCGT inserts give a lovely finish in all materials, even crappy mystery steel. I tend to do the interrupted/ rust crust cuts with CCMT and then finish with CCGT. I haven't really pushed DOC with CCGT on steel, but my only worry would be flex>jam>chipped insert. They produce a much lower cutting pressure too, so they're ideal for small hobby lathes.

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