How to Use a Glue Joint Router Bit for Strong Edge Joints

Quick Answer

Set your glue joint router bit to cut one half of the joint in each board, then mate the two halves for a strong, self-aligning edge joint.

Step-by-Step Setup and Use

1. 1. Set Router Speed: Adjust your router to 12,000 RPM as recommended for the Whiteside 3354. Higher speeds can burn the bit or the wood. Check your router's manual to confirm it can run at 12,000 RPM; many variable-speed routers go lower.
2. 2. Install the Bit: Insert the 1/2 shank into the collet, leaving at least 1/4 of the shank inside. Tighten securely. The bit's overall length is 2-3/4, so set the depth so the cutter engages fully but the bearing rides the edge. A loose bit can cause chatter or an uneven cut; always double-check tightness.
3. 3. Set Depth of Cut: Position the bit so the bearing rides along the board's edge. The cutter should cut the full profile in one pass. For stock thinner than 1/2, the bit may not cut correctly—stick to the recommended 1/2 minimum. Cutting too deep in one pass can overload the router; if needed, make two light passes.
4. 4. Route the First Board: Feed the board against the rotation of the bit, using a steady, moderate speed. Keep the edge flat against the fence and the bearing in contact. The bit will cut a female groove on one side. Pushing too fast can cause tear-out; too slow can burn the wood.
5. 5. Route the Second Board: Run the second board through the same setup. The bit will cut the matching male tongue. Both cuts are made with the same bit, so they mate perfectly. Ensure both boards are the same thickness for a flush joint.
6. 6. Test the Fit: Dry-fit the two boards. The joint should slide together with light hand pressure. If it's too tight, sand the tongue slightly; if too loose, adjust the fence or bit height. A perfect fit requires no clamping force to close; glue alone holds the joint.
7. 7. Apply Glue and Clamp: Spread glue evenly on both profiles, then press together. Use clamps to hold the boards flat, not to force the joint closed. Wipe excess glue before it dries. Over-clamping can squeeze out too much glue and weaken the joint.

Product Facts

• Glue Joint Router Bit x 1/2″ Shank – Whiteside 3354 (AstraHP Coated): One bit makes both cuts; recommended for material from 1/2 to 1-1/4 inches thick. You don't need separate bits for male and female profiles, saving setup time and ensuring perfect mating.

  

• Glue Joint Router Bit x 1/2″ Shank – Whiteside 3354 (AstraHP Coated): AstraHP Coated, 1/2 shank, 1-1/2 large diameter, 2-3/4 overall length, recommended RPM 12,000. The coating reduces friction and buildup, while the large diameter creates a deep glue surface for strong joints.