What wood is used for splines?
The spline itself can be made from plywood, hardwood or the same material as the joint being strengthened. For the ultimate in strength, the grain of natural woods should be oriented so that it’s running across the joint in the workpiece.
Do splines add strength?
Splines for strength When used on a miter joint, the spline adds extra strength to an otherwise delicate joint. The spline is also useful because it helps to align the two joining parts during assembly and glue-up. For extra strength, the grain direction of the spline can run at 90° to the grain of the boards.
How do you make a spline stronger?
For a spline to add strength to a joint, its grain must run across the joint, not parallel to it. Flex a piece of thin wood along the grain and it snaps easily. Now, take one of those pieces and try to snap it with the grain running from hand to hand.
How do I glue the splines together?
When the splines are glued, use a small acid brush (or similar) to apply a thin but consistent coat of glue to all surfaces of the grooves and the spline. Slip the spline into one piece, slip the other piece over the spline and repeat for the remaining pieces if there are more.
How do you cut a spline?
External spline can often be cut using a milling machine. Internal splines usually need some sort of slottting mechanism. Two easy examples are where the groove is a rectangular channel and where the groove is a V-shaped cut. 367 spline1
How do I repair a broken spline?
Slip the spline into one piece, slip the other piece over the spline and repeat for the remaining pieces if there are more. Put the assembly in clamps and apply just enough pressure to close the joints and raise small beads of glue along the joint line. Make sure the pieces are flat in the clamps and allow to dry.