Answer
Jan 30, 2026 - 06:54 AM
To prevent tear out when using a lock miter bit, always use a backer board behind your workpiece to support the wood fibers as the bit exits the cut. Additionally, make light passes instead of trying to remove all the material in one go, which helps reduce the risk of splintering.
The lock miter is an interlocking edge-to-edge joint, typically used at the corners of casework. Used in a table-mounted router, run at reduced speed, this bit cuts both halves of the joint. The same setup of bit and fence cuts both parts. One part is laid flat on the tabletop and fed across the cutter. The second is braced vertically against the fence and fed across the cutter. For best results use in a table-mounted router.
I find that this works very well using a Carbide tipped bit and a speed of not more that 18,000 RPM.
The lock miter is an interlocking edge-to-edge joint, typically used at the corners of casework. Used in a table-mounted router, run at reduced speed, this bit cuts both halves of the joint. The same setup of bit and fence cuts both parts. One part is laid flat on the tabletop and fed across the cutter. The second is braced vertically against the fence and fed across the cutter. For best results use in a table-mounted router.
I find that this works very well using a Carbide tipped bit and a speed of not more that 18,000 RPM.
