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Super Strong Splines for Miter Joints

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Miters are usually not the strongest joints, however we use them on a regular basis for becoming a member of image frames collectively. One technique for strengthening this connection is so as to add a spline, a skinny sliver of wood right into a slot the place the 2 miters be a part of collectively.  A standard approach to make these is to cut a slot about midway by means of the nook after gluing the body collectively and slide within the spline.

Standard spline that goes halfway through the miter.
Normal spline that goes midway via the miter.

A greater technique for making splines

On this technique, the image body and the splines are glued up all on the similar time. These splines are stronger as a result of they run right through the width of the miter and the grain is positioned to run perpendicular to the miter.

Making the slot-chopping jig is straightforward. It’s principally the other of my common spline jig.

Regular slot cutting jig (left) and alternative jig.
Common slot slicing jig (left) and various jig.


Making the slot-chopping jig

Glue collectively two scraps of plywood. One a bit taller than your rip fence, and the opposite piece sq.. I added a pair screws so I wouldn’t have to attend for the glue to dry.



Subsequent, sq. this meeting up by chopping off the underside triangle of the sq., shaving off just a little of the rectangle on the similar time.


It ought to stand sq. to the desk prime and fence.



Utilizing the jig

After slicing your image body items with their forty five diploma miters. Line up one finish with the triangle in order that the top is flush with the desk. To maintain this from slipping, clamp the board to the higher a part of the jig and cut out a slot.



To make the slot on the other finish, maintain the identical aspect towards the fence and cut the slot utilizing the opposite aspect of the triangle.


Making the splines

The grain course of those splines if what helps give these miters their power, You need the grain to be operating perpendicular to the miters, not the identical course.  To make these, choose a board that’s wider than the size of the miter joint.


Then resaw a board to the thickness of your slots.


Then crosscut this skinny board into the widths of your miter slots. I used a thicker board to carry down the skinny splines and hold them from flying away once I cut them




Gluing up

The great factor about these splines is that they assist with the nook alignment of the image body and stop them from sliding aside. Glue them into the slots and glue the miters collectively all at one. One the glue is dry, cut off the surplus and sane the frames clean.





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