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Thread: SCMS vs. RAS

  1. #1
    Join Date
    Jun 2010
    Vancouver Island, Courtenay/Comox Valley, British Columbia

    SCMS vs. RAS

    Can someone kindly explain to me why you push the SCMS to cut, and pull the RAS to cut, when both saws have the blade spinning in the same direction?
    AKA Young Grasshopper Woodworker
    AKA The Rookie

  2. #2
    Join Date
    Aug 2007
    Reno NV
    SCMS can go up, then out, then down, then back.

    RAS can only go back and forth.
    Programmer - An organism that turns coffee into software.
    If all your friends are exactly like you, What an un-interesting life it must be.
    "A door is what a dog is perpetually on the wrong side of" Ogden Nash

  3. #3
    Join Date
    May 2007
    Kansas City, Missouri
    As Brent mentioned, the control of the blade and depth of cut is a big difference in the safety if used properly. The RAS is essentially doing a climb cut, it's pulled into the work in a direction that makes the blade try to "climb" the cut. It's action if not controlled can cause injury as it comes toward the operator. The SCMS when used properly is doing something similar, but away from the operator. You can also control the depth of cut taken.

    In theory, quality of cut can also be controlled as when cutting through a 3" thick piece of Maple using a RAS would probably get some burn marks. Making several shallower cuts with the SCMS would be less likely to heat up and burn.

    To a small child, the perfect granddad is unafraid of big dogs and fierce storms but absolutely terrified of the word “boo.” – Robert Brault

  4. #4
    Join Date
    Nov 2006
    Oak Harbor Washington on Whidbey Island
    If you make several shallower cuts with the RAS it would be less likely to heat up and burn also. Most problems of burning on a RAS can come from what is called heeling (where the head on the carriage is not adjusted perfectly straight to make the cross cut. There is a fine adjustment for this. Or a dull & or gummed up blade.)
    "Forget the flat stuff slap something on the spinny thing and lets go, we're burning daylight" Bart Leetch
    "If it ain't round you may be a knuckle dragger""Turners drag their nuckles too, they just do it at a higher RPM"Bart

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