Saturday, December 13, 2014

The folding roof -- sloping ridge roof part 2

King Class
The folding roof (sloping ridge roof)

Die Konigsklasse
Das Turmdach als Faltdach

Finally finished this task model. The canted rafter is developed on the folding roof surface plane. Bernd Kuppers does a really good job in labeling the drawings with the use of TH and BH. In the fourth drawing below you can see how easy it is to label the lines using TH, BH, TS and BS and then transfer these lines  to the timber. I've always had a hard time remembering which lines were for the top of the heel cut. But using Bernd's labeling method makes it a no brainer to transfer the lines from the drawing to the timber.

TH = Top heel is produced by the intersections of the heel bevels with 
the rafter top edge (eave), and then runs parallel to the surface edge. 

BH= Bottom heel is produced by the intersection points of the rafter bottom edge 
with heel bevels in the ground, it is folded at right angles to the rotational 
axis into the plane and then drawn parallel to the surface edge.

Drawings showing canted rafters on the fold out roof surface for clarity. The canted rafter is any rafter that does not have a vertical edge. In these drawings the purlin, parallel to the eave, is developed on the draw down folding roof or fold out roof using the same TH = Top Heel Line and BH= Bottom heel Line for the heel cut at the hip or valley rafter. The skewed canted rafter, yellow, is just a purlin rafter skewed from the eave-plate line. The purlin rafter and canted skewed rafter have the top edge of the timber rotated into the roof surface plane. These drawings are just for clarity using the fold out roof surface method. Stick with the draw down roof surface plane used in the book.  The BH= Bottom Heel line is a lot easier and faster to develop on the draw down folding roof surface plane.

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