Half-lap joint jig
Put the jig to work
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.
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