Router Dado Cutting Jig
by Cabinetman, Mike Marvel
April 2007

  • This jig is basically a "T" square you make yourself.
  • The arm is out of one piece of plywood, with the center cut out of it.   Like it could be dropped on the TS for the long cuts, and
  • then jig saw across for the two ends.
  • The one I used for the drawing was cut out of plywood but from the end down both sides.   Since the end was open, I had to put that top piece to keep the spacing.
  • This one will accommodate a 4' dadoe.
  • The first pass puts into the jig the exact groove.
  • When inserting the panel, simply put mark on panel line up with groove, and set bar clamp so that the top bracket touches the right leg to keep it from moving.
  • I've used this type of jig for over 30 years and it's a very fast set-up.
  • It's accurate as all heck.
  • Can do long or short runs.
  • The panel in the picture is 18" x 18".

  • Joe:
    That's a COOL jig!!

    It took me awhile to GET the clamp procedure...   then it hit me...   you're just clamping the workpiece to the crosspiece of the T square!!   Ingenius!!

    I was thinking that a cabinet clamp like a Jorgy or Bessy might be easier to use...   AND a piece of backerboard could be placed over the far end of the workpiece (where clamped) to reduce tearout... Yes?   What do you think?

    Does the router you're using have a square base to be sure it guides 'straight' along the jig side? ...   or is your round base uniformly centered making it accurate in case the router got turned on the way across the cut?

    I LIKE your jig!!

    The NICE part being "line it up and cut" feature...   saving time & being accurate! ...   to say nothing about the unique way of clamping it!!

    Do I have your permission to add it to my web page 'collection'?

    Thank you...

  • It's very quick and really easy.
  • I just got used to a bar clamp.
  • They don't seem too bend under 5' long.
  • A scrap piece at the head of the subject would help for tearout.
  • I use a round base.
  • Get kinda used to which way to hold the handles, and actually it's very centered.
  • I usually leave one router with the bit that I used for the initial run that put in the first groove in the "T" part, set up just for dadoes with this jig.

  • Joe:
    I have a website where I 'collect' woodworkstuff that appeals to me...   stuff I like and don't want to forget where I saw it. :)

    When I see something I like, I ask for permission to put it on my website...   most people give me permission.

    I would like to add your dado jig to my website under:

    Would you please give me your permission to do so?

    By all means you are cool.   Glad you like it.   When I first started out, everything was a "secret".   Nobody would share anything.   Times were tough then, had to figure out how to do things.   Sometimes the idea just appears in our mind.   Actually, I think woodworkers are pretty inventive people.

    Details of Dado jig please?

    Email Mike...

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