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IndustryArena Forum > MetalWorking > General MetalWork Discussion > Carbide tipped reamers not available under about 0.1875"?
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  1. #1
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    Carbide tipped reamers not available under about 0.1875"?

    Doing some work in 4140PH and need to ream some holes. I found carbide tipped reamers for the holes around 0.25 and larger no problem. Not finding them for around 0.125". I am finding solid carbide. I will be doing these on a cnc mill with reaming immediately after starting with a spot drill and drilling so alignment should be very good. As I understand it carbide tipped tolerate more shaft flex and one of the main reasons to go with them. What are my options at the small size and precautions if I go with solid carbide?

  2. #2

    Re: Carbide tipped reamers not available under about 0.1875"?

    the key thing with carbide is to have it dialed in perfectly , otherwise you'll be looking at oversized holes or a broken reamer . For small holes like that I'd use cutting oil rather than coolant , or undiluted cutting fluid which will wash out with a blast of coolant .
    another option is cobalt

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