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Thread: SCMS Pull or push?

  1. #1
    Join Date
    Aug 2007
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    SCMS Pull or push?

    OK, I have just been watching a free DVD that came with a magazine. In it the guy was cutting using a SCMS. I always pull out, drop down and push cut.

    This guy was pull cutting through the material. Surely that is wrong...
    Did I mention it rains over here?

  2. #2
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    Quote Originally Posted by Ralph Laughton View Post
    Surely that is wrong...
    It surely is!

    A radial arm saw forces the wood down and against the back fence on a pull stroke because the head can't move upwards away from the cut. Pulling is the correct way to use a RAS.

    A SCMS, by design, pivots upwards. There is nothing mechanical to stop it from grabbing the workpiece and coming towards you faster than you intended.

    I have a nasty scar on my thumb where my SCMS caught in a cut due to wood tension (and maybe incorrect positioning) and flew up and towards me. The hand that was on the handle stayed relatively still while the blade came up. The guard didn't have time to come down and cover it.

    -JR
    Last edited by John Rutter; 11-03-2007 at 12:39 AM. Reason: include quote

  3. #3
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    Quote Originally Posted by Ralph Laughton View Post

    This guy was pull cutting through the material. Surely that is wrong...
    "Surely that is wrong" would be my answer.
    Last edited by Allen Bookout; 11-02-2007 at 09:46 PM.

  4. #4
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    Agreed, surely that is wrong. I'd really have to question that magazine's editors.
    Any sufficiently advanced technology is indistinguishable from magic.
    - Arthur C. Clarke

  5. #5
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    If it is a small piece I just cut down, like a chop saw, if it is wider, I always pull back, cut down and then push forward.

    Cheers!
    The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
    William Arthur Ward

  6. #6
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    I would vote for wrong also. I pull mine out, push down, and cut on the instroke. Otherwise, same as Stu described.

  7. #7
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    Uh-OH! I want to hear more on this subject. Being untutored, I assumed it was drop and pull and do it that way. Albeit, I don't like that the blade tries to 'race' through the wood. Need a new negative rake blade. Continue elucidating guys.
    "Folks is funny critters."

    Think for yourselves and let others enjoy the privilege to do so, too. ~Voltaire

  8. #8
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    it is probably not a good idea to do it that way although i've seen many people do it with no problems.

    what i do, is let the blade score the board on the way towards me just cutting about 1/16 or 1/8, then plunge down and finish the cut pushing away. i seem to get a cleaner cut that way because the scoring keeps the blade from chipping up on the top of the board

    chris

  9. #9
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    Quote Originally Posted by Chris Mire View Post
    what i do, is let the blade score the board on the way towards me just cutting about 1/16 or 1/8, then plunge down and finish the cut pushing away. i seem to get a cleaner cut that way because the scoring keeps the blade from chipping up on the top of the board

    chris
    That's the way I do it, too. Less tear-out.
    Jim D.
    Adapt, Improvise, Overcome!

  10. #10
    Join Date
    Dec 2006
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    535
    I once had the blade loosen doing it that way (pull that is), so now I always drop and push like most of the other posters.

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