Centering gauge parallelogram

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Project by geekwoodworker posted 06-05-2014 12:07 AM 7078 views 20 times favorited 4 comments Add to Favorites Watch

Built this jig so I could quickly center a mark for a mortise. In the past I would measure the width of the board and then subtract width of mortise and then mark it out (usually with mistakes and many different measurements). Now I just select the size of mortise I want and put the jig on and mark away. No math to make mistakes.

I generally build with loose tenons but this will work with integral ones also.

I made the most common sizes for which I like to use. I made one aluminum one that is 3/4”. It was a prototype and now I plan to make the rest from aluminum.

4 comments so far

View Woodknack's profile


13392 posts in 3154 days

#1 posted 06-05-2014 04:03 AM

Excellent. I tend to avoid chopping mortises when possible but this will be very handy.

-- Rick M,

View oldnovice's profile


7561 posts in 4142 days

#2 posted 06-05-2014 05:33 AM

Nice, functional, and probably a lot less expensive than this one!

-- "It's fine in practise but it will never work in theory"

View geekwoodworker's profile


378 posts in 2234 days

#3 posted 06-05-2014 10:29 AM


Yes I looked at the woodpeckers one also. I considered buying it (for less than half a second). Then after seeing how others have made thier own I decided I would make my own. Made a prototype first and it worked ok. So then went to work on this one. It works great and is very accurate.

thanks for the comments.

View SCOTSMAN's profile


5849 posts in 4359 days

#4 posted 06-05-2014 06:45 PM

Quite a simple idea and making it should be a nice project.I agree it is hard to justify the asking price when you consider how easy it would be to duplicate/make your own.I figure I might even attempt it myself in the summer when my woodshop and machioe shops are finally finished ,and getting it the way I want at last after several years using it as a store for all my son’s mavchinery he was storing at my place.I just love like you guys my shops it is a great life.Alistair

-- excuse my typing as I have a form of parkinsons disease

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