How to cut high speed steel
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    How to cut high speed steel

    I have 3 high speed steel knives from a wood planer that I need to shorten by several inches.
    What is the best way to shorten the knives without damaging them?
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    A cut off disc in a grinder and a wet rag to keep it cool should work. I would go slow and when it starts getting hot, cool it down with the wet rag. keefus
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    Keefus is right. You don't want to get them hot when grinding. This will make the metal hard and brittle.
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    A dedicated cutoff tool uses a much thinner disc. Doesn't produce anywhere near the heat as a grinder cutoff disc.
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    Getting too hot without quenching will actually take the temper out and soften them. Quenching from the wrong temp could result in excess hardness.

    An abrasive cutting wheel is your best bet though. Flood cooling it would be ideal. Got a tile saw handy?
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    Quote Originally Posted by Jim Timber View Post
    Getting too hot without quenching will actually take the temper out and soften them. Quenching from the wrong temp could result in excess hardness.

    An abrasive cutting wheel is your best bet though. Flood cooling it would be ideal. Got a tile saw handy?
    Thanks everyone for the replies. Learned something new. I do have 2 tile saws, one with an angle grinder as the head, the other has a 10" blade. I never though of using those for cutting steel. Thank you again.
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    Jim Timber's Avatar
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    Swap out to an abrasive wheel for metal and let'er rip.
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    I cut some high speed steel for shaper knives using a 10 inch abrasive blade on my table saw. Worked great. But I should have cleaned out the sawdust below the saw first. It was a dramatic and long lasting learning moment.
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    Quote Originally Posted by Jim Timber View Post
    Swap out to an abrasive wheel for metal and let'er rip.
    Why bother. Diamond may be overkill but it's already on the saw and paid for.

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    Quote Originally Posted by Beaver Cove Deere View Post
    Why bother. Diamond may be overkill but it's already on the saw and paid for.
    Because stone and metal have different characteristics. You're welcome to try it but I'd be prepared to buy another diamond blade, and an abrasive disc. ;)
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