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  1. #1
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    slot mortiser plans

    I'm thinking of making myself a slot mortiser using a router as the power unit. One problem I haven't resolved. Routers run in the 25000 rpm range while dedicated slotters hang in around 3600 rpm. Is there a way to slow down a router without sacrificing HP?

    Also, found one plan for making the device on the WWW. You guys have any sites to recommend that could expand my knowledge base?

    art

  2. #2
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    RE: slot mortiser plans

    I don't believe you can reduce speed w/o proportionally reducing HP in a single phase electric motor. You might consider reducing speed mechanically by means of pulley system, but that would necessitate modifying the router a bit...and would also take up considerably more room.
    I thought there were a few electrical engineers on this site at one time, but maybe that's changed...or I'm wrong. They could tell you why this can't be achieved. I believe there is a formula associated with this:

    HP = torque X speed / 5250, so when you reduce the number for speed (rpm) then the quotient becomes less as well (quotient being the HP)

    Dumb question: What is a slotter? At first, I was thinking that you were talking about a horizontal router/mortiser like David Marks uses, but then I realized that reducing speed wouldn't really be necessary...or would it? I'm relatively new to woodworking. -Bobby

  3. #3
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    Port Coquitlam, British Columbia, Canada.
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    RE: slot mortiser plans

    Have you looked at the kit Rockler has?
    http://www.rockler.com/product.cfm?page=18053&sid=AF078

    Frank C.
    Sawdust Making 101
    http://sawdustmaking.com
    Frank C

    Sawdust Making 101
    http://sawdustmaking.com

  4. #4
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    Linton, Indiana, United States of America.
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    RE: slot mortiser plans

    hey that's pretty slick. reg price might constitute building it, but for the sale price...

    the multi-router was the tool I was thinking about earlier!

  5. #5
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    RE: slot mortiser plans

    I want a horizontal mortiser. I thought if I used a router it could also double as a horizontal router.

    Slot mortisers usually run at much lower RPMs than a router. The slower speed makes for more precise control resulting in a smoother cut.

    art

  6. #6
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    Mar 2008
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    Eagleville, MO.
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    RE: slot mortiser plans

    maybe i'm stating the obvious...but what about a variable speed router?

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