Testing: Table Saw setup for Half Lap Joint

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Blog entry by Joe Lyddon posted 04-05-2012 12:46 AM 2266 reads 0 times favorited 7 comments Add to Favorites Watch

Testing: Table Saw setup for Half Lap Joint

I cut a piece of good hardwood scrap to about 3/4” x 4” x 11”

I measured 5” from one end & marked with knife.

I measured 10” from same end & marked with knife.

Knife-cut lines all the way around the board at each 5” point.

Labeled things to make it look nice.

I had cutoffs from the same piece of hardwood for testing the cuts.


Proceeded to setup for half-lap blade adjustment.

Right end against the table…

Cutoff Test piece on left side close to make Line lineup with test piece Edge…

Blade almost 1/2 thickness… with Rightmost Tip on the Center Line…

Adjusted Blade Ht. until left mark lined up with Test Piece edge…


Made Test Cuts #1…

Was OFF by about 1/16”.


Tried the setup again double checking very carefully…

Made Test Cuts #2…

Looks like it went the other way… Off about 1/16”

Looks like we’re back to making minor adjustments until we Hit it right on.


-- Have Fun! Joe Lyddon - Alta Loma, CA USA - Home: ... My Small Gallery:"

7 comments so far

View gfadvm's profile


14940 posts in 2888 days

#1 posted 04-05-2012 01:32 AM

OOPS, time for Rance to weigh in and explain where you went wrong. Thanks for testing/posting this Joe.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View MoshupTrail's profile


304 posts in 2679 days

#2 posted 04-05-2012 01:48 AM

Isn’t woodworking fun?

-- Some problems are best solved with an optimistic approach. Optimism shines a light on alternatives that are otherwise not visible.

View Joe Lyddon's profile

Joe Lyddon

10320 posts in 4251 days

#3 posted 04-05-2012 03:24 AM

Yes! LOL

I was thinking… Maybe I didn’t check the TEETH Points properly to the Alignment board…

-- Have Fun! Joe Lyddon - Alta Loma, CA USA - Home: ... My Small Gallery:"

View Don Butler's profile

Don Butler

1092 posts in 3594 days

#4 posted 04-05-2012 11:04 AM

Fundamentally the idea is good, but it’s hard to implement perfectly.
I really like jigs because most of them allow me to do tasks in a repeatable way.
While this idea has merit, it isn’t a jig, it’s a measuring device. All of us have made mistakes, large or small, using measuring devices and this concept is no different. Human imperfection and materials used make it hard to use mistake free.

-- No trees were damaged in posting this message, but thousands of electrons were seriously inconvenienced.

View ratchet's profile


1391 posts in 3985 days

#5 posted 04-05-2012 05:18 PM

Excellent description / diagrams of what you did. Thanks a miilion times for the testing.

View rance's profile


4266 posts in 3359 days

#6 posted 04-09-2012 01:32 AM

Joe, several things could be causing the problem. Your blade type, bow in your sled, your eyeball. :) In reality, I think ANY method will require sneaking up due to the above mentioned. You might put away your calipers and pick up your tape measure. :) Thanks for posting your results.

Don, well said.

-- Backer boards, stop blocks, build oversized, and never buy a hand plane--

View Joe Lyddon's profile

Joe Lyddon

10320 posts in 4251 days

#7 posted 04-09-2012 01:50 AM


I agree… too many things can go wrong, although, on the surface, it appeared that it was SO easy to do.

After all of the dust has settled, I think I like my old standby method.

Thank you for trying to make a simpler way of doing it… It just didn’t work for me… I don’t want to change blades to do it… etc…

Your way looked simple… a better way… a faster way… etc.
I guess my Older eyes, etc. just couldn’t hack it. LOL

Thanks again… Keep them coming!

-- Have Fun! Joe Lyddon - Alta Loma, CA USA - Home: ... My Small Gallery:"

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