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Half-lap joint jig

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Put the jig to work
Half-lap jig
Enlarge Image
Align the saw edge of the jig with the
rabbet layout line, clamp the jig in
place, and cut a saw kerf to define the
rabbet shoulders.
Making a half-lap jig
Enlarge Image
To clean out the rabbets, start with
the router edge of the jig 3/8" from
the stile ends, and make repeat
router cuts to the saw kerf.

Put the jig to work

Mark the pieces to be cut

Clamp together, edge to edge, the parts to be rabbeted. Secure them to your workbench with the ends and faces flush. Mark a line across the parts at the rabbet shoulders. Then, to prevent chip-out when the router bit exits the last part, adjust the cut depth of your circular-saw blade to one-half the thickness of the parts. Now cut a saw kerf at the rabbet shoulders, as shown top photo.

Chuck a 1/2" straight bit into your router, and adjust the cut depth to one-half the thickness of the parts. Then rotate the jig and clamp it to the parts, pushing the infeed end cleat against the first part to keep the jig square. Now clean out the rabbets, as shown second photo. Move the jig in from the part ends until the cut meets the saw kerf.


Comments (3)
pmd0809 wrote:

Vivo en Mexico y quiero las promociones que publican pero cuando registro mis datos, al llegar a lo relacionado con direccion no puedo acceder por que solo están los de EUA y ya no puedo enviar mi solicitud. ¿Que puedo hacer?

2/19/2012 05:25:10 PM Report Abuse
reffi wrote:

I cut rabbets,dadoes, tenons and half-lap joints by mounting a dado set on my radial alarm saw. Any cut that is going to be long that requires turning the saw head at right angles and using a rip cut should not be done alone. A slow feed and a person on each end is the way to go. I built a king-size water bead with a dado in each of the sides (like a drawer box bottom slot)in 1973. My wife and I were on opposite ends as we fed the boards through the saw.

2/17/2012 06:09:48 AM Report Abuse
Roger L. wrote:

Simple and effective jig, I keep a similar one in my truck that I made years ago . . . to cut door bottoms. Simply mark each side of the door for the correct clearance and then line the circular saw side with each mark. Clamp in place with padded grip type clamps, makes quick work of cutting a whole house of doors .

2/16/2012 10:59:52 AM Report Abuse

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