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Circular saw jig
First of all we need to measure the width "C" of the circular saw base.
We cut a 1.5cm long strip from the marquetry sheet and we glue it at a distance L longer than C from the edge of the guide base.
Guide base L longer than C 1.5cm long marquetry strip
We rest our saw on the base and against the marquetry strip and we cut. That edge we cut will tell us always were our saw cuts when we use the guide. We call that edge R1.
We check that the cut is perfectly straight
we cut a 2cm wide strip of plywood. That must be at least 1cm thick. We see which is the straightest edge and we call it R2.
Using a square we screw the plywood strip in the back side of our guide making sure that R1 and R2 are at a perfect 90º angle.
Yes, Sunday clothes
We turn it 270º to the left. That is not strictly necessary, 90º to the right would be enough.
If we put the plywood strip so that R1 and R2 are at a 45º angle, we´ll can use the guide to make miter cuts.
It is better to make a mark to know were to put the screw.
To make miter cuts we can put the plywood strip in two different positions.
One position is enough, but we´ll get the guide ready to use in both positions because we don´t know which will be the handiest position each time we´ll use it.
To put the plywood strip we always rest one side of the square against R1 and the other against R2.
We have four holes in the plywood strip. We need to number that holes and we number the holes in the base too so that we can put always the strip in the right position without making mistakes.
With that numbers if we put a screw in 1 and in 2 we have the guide ready to make 90º cuts.
If we put a screw in 2 and in 4 we have the guide ready to make 45º cuts in one direction.
And if we put a screw in 1 and in 3 we have the guide ready to make 45º cuts in the other direction.
We must be careful when we put the strip in this position. My strip is very near the corner.
The problem is that the saw will begin to cut before it is well rested against the guide
Here we can see it is very near the corner.
It would be better to put first the strip in this this position, then the position for the 90º cuts and then the other position for miter cuts.
We put the strip so that it is not that near the corner. We move it towards R1.
To use the guide we clamp the board we want to cut to the workbench and we clamp the guide in the position we need to cut.
R1 shows exactly were the saw will cut. That way we´ll cut the wood below the guide right to the left line.
The blade of the saw will remove a slice of wood equal to that between the lines plus the lines.
We must check that the cut is at a 90º angle with all the faces of the wooden bar.