A spline joint is used to join two pieces of wood
together, using a thin piece of wood, referred to as the spine. The
picture below provides you with a pretty good idea, how to join two
pieces of wood together, using a spline, along with a couple of grooves
that were cut into each board.
Spline joints are often created by a router or saw and
these joints can definitely vary in size. I actually used a power tool
called a Biscuit Jointer to cut spline joints into pieces of wood that I
was planning on joining together.
The Biscuit Jointer would cut a slot or groove into each side of the
board and and then you would insert an oval-shaped spline (often
referred to as a wood biscuit), into each groove, to join the two boards
together, creating a spline joint.
This was one of my favorite tools and I used it for gluing large
tabletops together and cabinet door frames. They're easy to use and the
biscuits or splines are relatively inexpensive purchase.
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