On pieces needing extra strength, two tenons are stronger than one. A double mortise and tenon joint gives more glue surface while retaining the strength of the mortised piece. Very broad pieces also benefit from double tenons. Say you are making a standing desk with broad rails forming the body. A tenon left the full depth of the rails would be quite broad and strong, but it would have to fit into a very long, slotlike mortise in the leg, weakening it considerably.
The solution is to break the broad tenon into several smaller ones separated by a shallow tongue. This is also the solution for "breadboard" ends on tabletops and lids. Commonly called clamp joints, the tenons and tongues on the ends of the broad table boards fit into mortises and grooves in the narrow end boards, or clamps. The clamps keep the broad boards in line and reduce the exposed end grain in finished pieces.
You can saw the shoulders of tenons across broad boards in the usual way, but the cheeks must be split out and planed smooth across the grain. Once the tenon stock is the proper thickness, saw out the waste separating the individual tenons with a back saw followed by a turning saw. The groove and mortises in the clamps can be cut by the same method used in undertaking frame and panel work, which comes next.
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There are a lot of things that either needs to be repaired, or put together when youre a homeowner. If youre a new homeowner, and have just gotten out of apartment style living, you might want to take this list with you to the hardware store. From remolding jobs to putting together furniture you can use these 5 power tools to get your stuff together. Dont forget too that youll need a few extra tools for other jobs around the house.