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  • Hole saw mandrel

    How do you change the hole saw mandrel? I purchased a saw with the mandrel attached and I now need to change to a larger diameter.

    Thanks

  • #2
    Re: Hole saw mandrel

    Maybe post a picture! Either it will screw out like a bolt or there could be a screw on the side to loosen.

    Comment


    • #3
      Re: Hole saw mandrel

      I think some of the hole saws that come with the mandrel attached, are not removable, ,my son has bought some that come that way, I have not looked close to see if the mandrel is removable or not, but since there were only about $1 more than the other hole saws he went that route.

      the ones he has been buying are similar to the ones in this URL, http://www.drillspot.com/products/41...2-7_8_Hole_Saw they indicate the mandrel is built into the saw,

      mine with the removal mandrel has a knurled ring that pushes two pins into holes in the blade and then when those are backed up the mandrel unscrews, see picture below,
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      Last edited by BHD; 02-23-2009, 07:34 PM.
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      • #4
        Re: Hole saw mandrel

        Are your hole saws like these? If yes, the arbor/mandrel is welded to the hole saw. Only the pilot hole drill is removable.
        http://www.mkmorse.com/rm1.html

        I prefer hole saws of this type myself.
        http://www.mkmorse.com/mc2.html

        You use them with arbors/mandrels like these.
        http://www.mkmorse.com/ak.html

        Does your hole saw look like any of the above?

        Comment


        • #5
          Re: Hole saw mandrel

          My mandrel looks like the one BHD has pictured. I've backed off the thumbwheel and loosened the set screw and tried to back the saw off the mandrel without success. I will try a tighter grip and more leverage.

          Thanks to both for your help!

          Comment


          • #6
            Re: Hole saw mandrel

            If you're mandrel looks like the one BHD posted, you should only have to pull the knurled ring out, and not loosen the set screw. The set screw is to hold the drill bit in and does not affect changing the hole saw. If you have pulled out the knurled ring and can't unscrew the hole saw, maybe clamp the hex shaped end in a vise (not too tightly), insert a flat blade screwdriver through the chip removal slot with the end of the screwdriver on the drill bit and gently try to loosen the hole saw. It's worked for me plenty of times. Good Luck, David.

            Comment


            • #7
              Re: Hole saw mandrel

              Thurman

              Very good advise there. Wrapping the hex shank of the arbor/mandrel with a rag before gripping it in vise jaws helps protect it. If the screwdriver doesn't bust it loose, a large pair of tongue & groove <aka> Channellock pliers should.

              Be sure the pins are fully retracted.

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