Yesterday Dan, Greg and I began construction on a hexagon end roof. To start off we measured the height, from the floor up to the top edge of the ridge board, which came to 2360mm. From this we made one plate at a length of 4720mm (twice the length of the height), which gave us the half span either side of the ridge centre line. The half span equalled the height because we decided to again do a 45 degree pitch roof as it saved alot of space in the small work area we had.
Then we came out from the edge of the ridge, running with the ridge, out 2360mm. From this we had a rectangle with sides 4720 and 2360.
As we had already determined from our experience with the truncated hip, when you put a plate 45 degrees across the corner of a plate and bring it in, the two new angles created are 135 degrees.
The above diagram then demonstrates how we figured out how to get even length sides ( B ) from our knowledge of the half span ( 2360 ) and its corresponding Tan angle of 67.5 degrees.
1 comment:
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