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What kind of hole cutter

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  • What kind of hole cutter

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    Not wanting to highjack the Hole Saw thread. When reading the hole saw thread I remembered these cutters that I picked up at a yard sale a few years back. Naturally they must be some sort of hole cutter, the largest is 1.125" the smallest is .343 as I remember. My question is why the removable spring loaded center pin?

    I would rather have tools that I never use, than not have a tool I need.
    Oregon Coast

  • #2
    You can center the point on a punch mark, no need to drill a pilot hole. Also, probably helps with ejecting the disc.


    • #3
      Spot weld cutter. Hit the center of the weld with a center punch for the spring center. It leaves the center of the spot weld on the opposite piece which makes it easy to reassemble - line it up and fill the gap with filler rod.

      I have one that's about 3/8" OD - but are there really any 1-1/8" spot welds?

      There are no stupid questions. But there are lots of stupid answers. This is the internet.

      Location: SF Bay Area


      • #4
        They look like cutters made by Jancy Engineering I think they were called RotaBore. They were intended for thin material. Jancy developed a mag base drill of high quality. They were bought up by one of the high end German tool makers. The cutter line was discontinued.


        • #5
          pin is for centering and ejection. hougen rotabroaches are similar but these with the solid shank are probably nicer to work with


          • #6
            Definately annular cutters, no flighting so must be thin stock as stated, handy in a rotobroach


            • #7
              The smaller ones look very close to my Jancy Roto-Bor, and all do appear to be hole saws of that nature:
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              • #8
                Never saw the ones made by Jancy but have used these for years.