Kerf Making Jig

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Project by GarageWoodworks posted 05-20-2015 05:39 AM 4267 views 18 times favorited 7 comments Add to Favorites Watch

I made this kerf making jig a few years ago but I don’t think I ever shared it here. It helps you to create tight fitting half lap joints very easily.

The screw can be tightened or loosened to create tighter or looser fitting dadoes. The width of the wood and screw minus the width of the wood equals the width of your saw blade.

How it’s used:
1. Cut one is made with the work against the end w/o the screw w/ the piece to be inserted between your miter gauge stop block (see picture 3).
2. Second cut is made by flipping the jig over and removing the inserted piece and referencing the work off of the screw end.
3. Clean out the material in between the two cuts.


(width of wood and screw – width of wood) = width of blade kerf

Watch a video demo

Watch a project build using the jig

-- Subscribe on YouTube:

7 comments so far

View bbasiaga's profile


1242 posts in 2233 days

#1 posted 05-20-2015 10:52 AM

Simple and effective. Nice.

The second link doesn’t work.


-- Part of engineering is to know when to put your calculator down and pick up your tools.

View GarageWoodworks's profile


539 posts in 2394 days

#2 posted 05-20-2015 11:14 AM

Thank you. The second link should work now.

-- Subscribe on YouTube:

View CharlieK's profile


586 posts in 4031 days

#3 posted 05-21-2015 01:42 AM

Very clever and super simple, too. I love it!


-- Adjustable Height Workbench Plans

View GarageWoodworks's profile


539 posts in 2394 days

#4 posted 05-21-2015 01:58 AM

Thank you. Considerably easier to make than the more popular alternative ;)

-- Subscribe on YouTube:

View TopamaxSurvivor's profile


18423 posts in 3914 days

#5 posted 05-21-2015 06:07 AM

Another awesome post! Thanks,

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View NormG's profile


6378 posts in 3242 days

#6 posted 05-22-2015 01:44 AM

Great solution

-- Norman - I never never make a mistake, I just change the design.

View tdv's profile


1196 posts in 3308 days

#7 posted 05-22-2015 07:49 AM

Brilliantly simple Brian I made one of the complicated kerf masters I prefer this one Thanks

-- God created wood that we may create. Trevor East Yorkshire UK

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