Lock mitre

Another effective variation of the mitre joint is known as a "lock mitre" (Fig. 614). The lock, of course, refers to the tongue-

Its complexity defeats its advantages.

and-groove arrangement inside the mitre. This joint is the strongest and the best of the variations, but to make it you need a shaper with special cutter knives. Don't try a lock mitre unless you have a shaper. However, if you are having a shop make your cabinets, try to get them to put your units together using this joint wherever possible.

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