Wednesday, November 6, 2013

European Task Model #3

This is a  Swiss designed task model and it's a tough one. Draw out the geometry and build it in 7 hours. Yea, right. The hip rafter on the left side of the task model has a claw on it. I'm just guessing this was the correct development for the hip rafter claw angle. The rotated rafter on the left side of the task model meets the hip rafter at a skewed angle and has a hidden center line that must be transferred to the timber correctly. The cut on the end of this rotated timer is something like the witches cut. Make two different cuts across the timber to produce the correct bevel angles at the foot of the rafter.





Ground Plan. Grundriss


Develop the Profiles for the hip rafters and the dihedral angles as well.

Develop the Jack Rafter Claw Lines.

Develop the internal edge of the hip rafter  and seat line on the folding roof surface.





Mark perpendicular lines on the timber placed over the folding roof surface. Then mark the miter angles, back bevel angles and claw lines.


Both rafters on the right side of the task model marked and developed for the folding roof surface.

Dimension used for the internal edge of the hip rafter on the left side of the task model.



Folding roof surface developed for the left side of the task model.

Profile rafter development for the seat lines in plan view and for the roof surface.


Rotated rafters drawn on the roof surface.


Rotated rafter marked and developed for the folding roof surface.



Drawing for developing the claw lines on the left side of the task model.


The complete geometry for the task model.




2 comments:

  1. This is a difficult task and I look forward to trying it out in the workshop. The Austrians, Swiss and the Germans are the masters at this game and when you consider that a competition full of young apprentices in Switzerland successfully completed this task in seven hours you can appreciate the standard of their game!

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    1. Yea, at 7 hours it mind boggling that anyone, let alone an apprentice, could complete the task model in the given time. Hopefully, in the next year or two we'll have an English speaking country up to the task.

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