Half-Lap Joints

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Forum topic by theatrecarp posted 02-28-2011 08:52 PM 1566 views 0 times favorited 8 replies Add to Favorites Watch
View theatrecarp's profile


2 posts in 2637 days

02-28-2011 08:52 PM

Topic tags/keywords: half lab joints jig question

Hey everybody,

I am new to Lumber Jocks. I am a heatre carpenter and we are building a show with a lot of windows (approx. 30-40) utilizing half lap joints. I was wondering if anyone had any suggestions on how to create a jig. We will be building them out of 1×4. Thanks in advance.


8 replies so far

View TheDane's profile


5423 posts in 3656 days

#1 posted 02-28-2011 10:15 PM

I have used a tenoning jig to cut them … first, I set the table saw to cut the ‘shoulder’, then use the tenoning jig to whack off the ‘cheek’. Takes a little setup, but once you get the tenon jig dialed in, you can knock them out pretty fast.


-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

View RONFINCH's profile


143 posts in 2917 days

#2 posted 02-28-2011 10:21 PM

I would think just a stop block and a dado blade, no jig necessary.

View rhett's profile


742 posts in 3660 days

#3 posted 02-28-2011 10:56 PM

You should have the theatre buy you a Kreg jig. I am sure the sets would go together twice as fast.

-- Doubt kills more dreams than failure.

View artthruwood's profile


28 posts in 2755 days

#4 posted 03-01-2011 12:48 AM

Set your dado set as big as it will go then throw your mitre gauge on and nibble away.
The setup stays the same for each mating surface so its not very complicated

-- slowing down with bring you greater speed then going fast

View chrisstef's profile


17374 posts in 2999 days

#5 posted 03-01-2011 02:24 AM

ditto on what art said … but if you start getting a lot of tear out on the back end put another board behind it that way your backer board takes the tear out and not your work piece. Good luck.

Welcome to Lumberjocks by the way …

-- Its not a crack, its a casting imperfection.

View theatrecarp's profile


2 posts in 2637 days

#6 posted 03-01-2011 04:30 AM

Thanks everyone. We have researched all your ideas. We actually have to build 57 plus at 7 different styles. I need a solution that an inexperience student can do. Most of our work force are students doing lab hours.

rhett: the Kreg Jig looks really cool and we will definitely look into it.

art, chris & ron: We have a saw stop table saw and changing a blade is a pain but also we cant really afford to buy a dado blade and if the saw trips buy another one.

TheDane: The tenoning jig looks interesting.

View Kindlingmaker's profile


2656 posts in 3519 days

#7 posted 03-01-2011 04:55 AM

Do you have a band saw? If so it would be vary easy to set up and make your half lap joints that way and its fast and a little more safe than some TS.

-- Never board, always knotty, lots of growth rings

View Kindlingmaker's profile


2656 posts in 3519 days

#8 posted 03-01-2011 05:01 AM

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