Root > Joints > Case > Rabbet
Rabbet Case Joints
A rabbet is a recess cut across the end or along the edge of a board. Essentially
it is a dado that has one side off the end or edge of the board.
Rabbet joints usually only present end grain to long grain surfaces for gluing,
and since this is a relatively weak situation, rabbet joints should be supplemented
with fasteners.
Rabbet joints are primarily found at the corners of cases, such as between drawer
sides and fronts, or top-and-bottom to sides of vertical cases.
When referring to rabbet joints at the end of a board, the depth is the distance
measured from the face of the board, and the width is the distance measured from
the end of the board. The cheek is the face formed on the tenon produced by the
rabbet, and the shoulder is the face with end grain inside the portion that was
rabbeted.
Single-Rabbet Joint
This is the most basic form of rabbet joint. It is formed by having the rabbet on
only one board, and that rabbet is the full width of the mating board. The depth
of the rabbet is usually at least one half of the width, and the deeper it is made
the less end grain will be visible. Taken to an extreme, the depth can be such that
only a thin veneer strip remains to cover the width of the mating board, but then
the joint is almost a butt joint since the rabbet lip no longer provides structural
support, only an aesthetic veneer to cover end grain.
Double-Rabbet Joint
When both pieces recieves a rabbet it is referred to as a double-rabbet joint.
Mitered Rabbet
Mitered rabbets provide the appearance of a mitered corner, while providing positive
registration for easy clamping and assembly. Once assembled, this joint also provides
additional resistance to shear and racking.
To construct mitered rabbets, one board receives a rabbet that has a depth that
is (usually) half its thickness and a width the full thickness of the mating board.
The mating board would have a rabbet which is the same as its mate's depth,
but only half the width. The remaining tenon is mitered.
Mitered Rabbet With Dowels
A further variation with a mitered rabbet is to introduce dowels or biscuits to
further lock the two boards together. Drilling perfectly aligned holes is not possible
without a jig or appropriate boring machine, but if it is available the creation
of the required holes is a simple process. The benefit the dowels provide is positive
registration during the assembly and glueup phase, and it also adds considerable
resistance to joint separation.
Dovetailed Rabbet
If one rabbet is cut with an angled shoulder and the other board with a matching
angled cheek, the two boards join with a dovetail shaped joint. This is slightly
more resistant to racking than a conventional rabbet joint.
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