How to Set Up a Lock Miter Router Bit for Drawer Boxes
By Premium CNC & Router Bits for Precision Cutting | Published: 2026-10-24
Category: How-to Guides
Learn the precise setup steps for a 45 degree lock miter router bit to create strong, seamless drawer box joints. Includes common mistakes and adjustments.
Quick answer
Set up your lock miter router bit by first adjusting the bit height so the pin aligns with the center of your stock thickness, then fine-tune the fence position until the joint closes flush with no gaps.
Why lock miter joints work well for drawer boxes
A lock miter joint creates an interlocking corner that looks like a single piece of wood from the outside, while providing a large glue surface for strength. This makes it ideal for drawer boxes where both appearance and durability matter.
The 45 degree lock miter bit cuts both halves of the joint in one pass, so you don't need to change bits or flip the workpiece. However, setup is more demanding than a standard rabbet or dado joint because the pin-and-groove geometry must match your exact stock thickness.
Lock miter router bit setup steps
- 1. Set the bit height: Install the bit in your router table and raise it until the tip of the pin (the pointed part of the cutter) aligns with the exact center of your stock thickness. Use a caliper or a setup block to verify. For 3/4-inch stock, the pin tip should be 3/8 inch above the table. Common mistake: Setting the pin too high or low will cause the joint to be proud or recessed on one face.
- 2. Set the fence position: Position the fence so the flat face of the stock rides against it while the cutter removes material from the edge. Start with the fence flush with the bearing (or the cutter's outermost edge), then make test cuts on scrap. Adjust the fence incrementally until the two test pieces interlock with no gap and the outside faces are flush. Checkpoint: The joint should close with light finger pressure; if you need to force it, the fence is too close.
- 3. Test and fine-tune the depth of cut: Make a full pass on both pieces of scrap. Assemble the joint and hold it up to a light source. If you see light through the joint, the depth of cut is too shallow—raise the bit slightly. If the joint is tight but the outside faces are not flush, adjust the fence instead of the bit height. Always use the same feed direction and speed for consistent results; a slow, steady feed reduces tear-out.
Recommended bits
- 45 Degree Lock Miter Router Bit – Whiteside 3362: The Whiteside 3362 has a 2-inch diameter, 1/2-inch shank, and is designed for stock from 1/2 to 3/4 inch thick. This bit is a good choice for standard drawer box stock like 1/2-inch or 5/8-inch plywood, and its smaller diameter allows use in most router tables.
45 Degree Lock Miter Router Bit – Whiteside 3362 - Large 45 Degree Lock Miter Router Bit – Whiteside 3360: The Whiteside 3360 is the largest lock miter bit, with a 3-1/8-inch diameter, handling stock from 1/2 to 1-1/4 inch thick. Use this bit when building thicker drawer fronts or boxes from solid wood up to 1-1/4 inch; the larger diameter requires a router with enough power and a stable table.
Large 45 Degree Lock Miter Router Bit – Whiteside 3360
