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  • wobbly hole saw drums?

    hey all,
    so today i purchased a ridgid 13 piece bi-metal hole saw set (7040). when attempting to use it i discovered something i considered odd. if i use the 1-3/8" or larger bits i need to use the mandrel with the drive pins (labeled mandrel B). the issue is that to engage the drive pins the saw drum can't be screwed tightly all the way down on the mandrel. i have to back off the drum about 1/8th of a turn to line up the holes in the drum with the drive pins on the mandrel. so once the drive pins are engaged, the drum is not seated tightly against the mandrel, hence it's a little loose and it can wobble a bit. this seems bad to me. does this sound normal? is the drum supposed to be a bit loose? perhaps the kit i bought is just defective? i was expecting the drum to be seated tightly against the mandrel, but having never purchased hole saws before i don't know if this is normal or not. any advice would be appreciated.
    thanks in advance.
    ed

  • #2
    Re: wobbly hole saw drums?

    I've noticed the same thing with other brand hole saws. As long as the pins are engaged it will work fine, since the pins take the sheer load while drilling.

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    • #3
      Re: wobbly hole saw drums?

      Sounds like it works the same as mine (not Ridgid)

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      • #4
        Re: wobbly hole saw drums?

        It's right. If the larger cutters seated like the small ones the torque would be so great you would never get them loose.
        info for all: http://www.hoistman.com http://www.freeyabb.com/phpbb/index....wwtoolinfoforu --- "I like long walks, especially when they are taken by people who annoy me."

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        • #5
          Re: wobbly hole saw drums?

          If this really bothers you (It's normal) here is a way around it. The $$$ factor keeps me away. http://www.mkmorse.com/rm2.html
          Last edited by Woussko; 03-25-2007, 03:26 PM.

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          • #6
            Re: wobbly hole saw drums?

            Hei EDP, like the others write, don't worry about it. The pins take the drive, like Papa-Dan says, and when you begin to cut, then things just stabilize nicely. I cut holes in stainless, up to 85mm, with this kind of hole saw. An "error" of +1 mm is about as big as it ever gets, and a sign that the bearings on the drill-press should be checked.

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            • #7
              Re: wobbly hole saw drums?

              Originally posted by Woussko View Post
              If this really bothers you (It's normal) here is a way around it. The $$$ factor keeps me away. http://www.mkmorse.com/rm2.html

              I got a couple of those hole saws, I don't remember where I purchased them from, but they are really high quality. I got them a few years ago because I needed a pilot-less hole saw to drill out some frozen recessed aluminum lug nuts on a Porsche wheel, and that was the only idea I could come up with. It worked great.

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              • #8
                Re: wobbly hole saw drums?

                Sweet. Thanks for all the quick replies. I now feel reassured about my purchase and i guess i'll go and start ripping some holes in wood.
                edp

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