Lock Miter Router Setup

A lock miter router bit cuts a 45 degree miter with a tongue and groove.

Lock miter router setup.

In woodworking circles the lock miter is often referred to as a trick bit by a feat of geometric genius the bit creates both halves of a mitered corner complete with interlocking tongues and grooves with a single router table setup. On the thread mentioned above there were many good suggestions for setting up the lock miter. Once it does it delivers a very strong and elegant miter joint that is virtually impossible to detect from the outside and offers the additional advantage of being self. 45 lock miter router bit instructions set bit height and fence depth 1.

With the lock miter master jig you can set up a lock miter bit in no time at all. One is for smaller router bits cutting 3 8 to 3 4 thick stock the other is for the larger bits cutting 5 8 to 1 1 8 thick stock. Align the midpoint of the lock miter cut with the centerline of the workpiece. In an effort to not completely derail that thread i thought it would make sense to have a dedicated thread to discuss tips and tricks to setting up a lock miter joint on the router table.

There are two sizes of the lock miter master jig. When correctly cut the parts go together at a perfect 90 degree angle and the interlocking tongues and grooves make for lots of mechanical strength and glue surface area. Set the initial router bit height by using a piece of your stock as a reference. Set the approximate fence depth by visually.

You need to get both the fence position and the bit height exactly right in order for this joint to work. Your goal is to have a and b equal to each other. First a diagram the numbers shown are for the infinity lock miter jr. Simple steps for airtight joints.

Check out our guide to learn the r. Router bit item 55 502.