June 5, 2012

Cutting Dormers: part 2

photo copyright Karin Corbin 2012
Cutting dormers for the Elizabethan birdhouse part 2.

This time I am using the same miter slot sled jig I made in part 1  to cut a dormer for the back of my structure and also  the two side gable  ends. These pieces are triangular without any vertical side lengths. I have changed the angle of my miter fence using the 60 degree drafting triangle and now the base of the triangle will rest against the fence unlike in part 1 where the vertical sides were resting against the fence.
photo copyright Karin Corbin 2012

The first step was to cut a piece of material to the width of the base of the triangle given in  my measured drawing.
photo copyright Karin Corbin 2012
photo copyright Karin Corbin 2012

The right side of my jig was cut off by the saw blade so that is an easy indicator of where the actual cutting line is and I will make use of it as the registration for the point of my triangle. All I have to do is place a scrap piece of plywood at the corner where the fence and that right side of the jig intersect. Then I butt the material I am using for the dormer over to that location, remove the scrap and while holding the material down on the jig against the fence I slide it on through the saw blade to make the first cut. I always turn off the saw motor and let it come to a full stop before removing the part from the jig or trying to remove the waste cutoff piece.

photo copyright Karin Corbin 2012
Now flip your material over, register it again to that same intersection as in the last step (don't forget to remove that scrap you used to located the corner of the triangle) and then cut the last side of the triangle. The peak of your triangle will be perfectly centered across the width and that means it will also be the correct height. This is a very simple method once you get the hang of making triangles this way on your table saw. But if you are going to do lots of them exactly the same size for a production type of product then use a stop block on the left end of the fence instead of registering your pieces it to the corner each time.
photo copyright Karin Corbin 2012
I will do a post on making the roof cuts for the dormers later, it involves making compound cuts, a bit more complicated as you have to make a left and a right side but  it is  also done with a miter slot jig.

Elizabethan birdhouse

Cutting dormers part 1
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