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Thread: Router Flush Trim Jig - Offset

  1. #1
    Join Date
    Apr 2007
    No, not all of SoCal is Los Angeles!

    Router Flush Trim Jig - Offset

    There are several examples of this from the usual sources, ShopNotes, Woodsmith and Popular Woodworking plus the jigs and fixtures collections that are available. The premise is that a sub plate elevates the router allowing the bottom of the plate to rest at the desired level and the bit to pass over a proud surface, like edge trim, to bring it flush.

    I have an old battle tested offset base that, as you can see from all the holes in it, has served more than its share of purposes. All the extra holes make this a little hard to look at but, here goes;

    Here is a router mounted to the offset base. Most versions of this jig call for you to make this offset base as part of the effort; I just happen to have one that is "well used" and I don't mind a few more holes:

    Click image for larger version. 

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    I cut a piece of acrylic to the shape I am after. The important part is the area approaching the bit. It should angle away to each side to allow pivoting the motor for stability and support during the cutting operation. This angle-away profile is also what allows you to sneak up on corner areas of wrap-around trim. The rest of the sub base could be any shape that won't get in your way. I double taped my blank to the original offset base and flush trimmed it on the RT.

    I then drilled through holes in the offset base and tapped receiving holes in the sub base:

    Click image for larger version. 

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    It goes together something like so:

    Click image for larger version. 

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    Set the jig on the surface you wish to level to. In this example my workbench surface represents a table top adn the piece clamped in my vise represents some trim I may have glued around it.

    Click image for larger version. 

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    Here's a close up of the bit/sub base relationship:

    Click image for larger version. 

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    So the reference surface is on the left in this pic, the proud material held in the vise is brought flush with the reference surface. In the real world, the trim would be glued to the reference surface so, ignore the vise jaw:

    Click image for larger version. 

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    The general idea of this jig is to allow flush trimming where you would not want to hold the router perpendicular to the edge (awkward) or you fear damaging the reference surface's veneer.
    Last edited by glenn bradley; 07-18-2010 at 02:24 PM.
    Any sufficiently advanced technology is indistinguishable from magic.
    - Arthur C. Clarke

  2. #2
    Join Date
    Mar 2007
    Southeast Pa
    Nice show and tell!

  3. #3
    Join Date
    Oct 2006
    ABQ NM
    Very slick, Glenn. Thanks for the pics and explanation.
    When the going gets weird, the weird turn pro. - Hunter S. Thompson
    When the weird get going, they start their own forum. - Vaughn McMillan

  4. #4
    Join Date
    Jun 2007
    Oceanside, So. Calif. 5 mi. to the ocean
    OK Glenn---Where was this detailed set up when I needed it about 10 days ago?

    Great post.


    First of all you have to be smarter than the machine.

  5. #5
    Join Date
    Jul 2009
    Amherst, New Hampshire
    Great post Glenn
    Faith, Hope & Charity

  6. #6
    Join Date
    Oct 2006
    Tokyo Japan
    Very slick, I can see where that will come in handy
    The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
    William Arthur Ward

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