## Sunday, April 13, 2014

### European Championship for Carpenters task model 2014.

This current European Championship for Carpenters task model is extremely complex. I wonder if the apprentice carpenters had the drawings before the competition? Or how many of them actually completed the task model?

Here's a couple of drawings of the European Championship for Carpenters task model 2014. I'm still not done, but you can get an general idea of how much geometric roof framing knowledge each of the apprentice carpenters must know to complete the task model.

3D drawing of the European Championship for Carpenters task model. I'll use this drawing to verify the geometry I develop is correct.

Basic ground plan of the roof.

Technique to develop the eave line that is level in plan view.

3D drawing of the hip rafters and raking/sloping plate lines.

3D drawing with plumb lines to establish the location of the jack rafters and purlin rafters on the roof surface.

Drawing of the base that holds up the roof.

Front sloped legs of the base.

Drawing with the legs and plates of the base.

Trying to establish the rotation of the hip rafter rotated into the roof surface.

Developing the profile rafter slope angle on the sides of the task model.

Raccord drawing of the roof surface.

Raccord drawing of the roof surface with the rafters on the roof surface.

Trying to develop the correct location of the rafters on the roof surface.
Drawing showing the technique I used to establish the miter line on the roof surface using the hip rafter backing triangle and the depth of the profile rafter.

Drawing with the hip rafter foot print developed from the hip rafter material block rotated to the hip rafter backing angle.

Drawing showing the development of the Devers De Pas line for the DP side of the hip rafter rotated into the roof surface. Sure am glad I studied the Treteaux angles.

Transferring the lines to the sides of the timbers on the rof surface.

Drawing showing the miter and claw lines on the roof surface. I got the miter and claw lines dimensions from my RafterTools app for iPhone or Android.

Tréteaux Angles
```tréteau à devers

Roof Eave Angle = 126.58678
SS = Main Rafter Slope Angle = 38.65981
S = Adjacent Rafter Slope Angle = 37.05220
```
```__________________________________________________
DD = Main Plan Angle = 60.00000
D = Adjacent Plan Angle = 66.58678

R1 = Hip Rafter Slope Angle = 34.71501
C5m Main Hip Rafter Backing Angle = 18.20076
C5a Adjacent Hip Rafter Backing Angle = 13.85266
Valley Sleeper Saw Blade Bevel Angle = 90° - (C5m + C5a) = 57.94657

P2m = Main Jack Rafter Side Cut Angle = 24.26751
90° - P2m = Main Roof Sheathing Angle = 65.73249
P2a = Adjacent Jack Rafter Side Cut Angle = 19.06421
90° - P2a = Adjacent Roof Sheathing Angle = 70.93579
```

```Purlin Depth = 70
Hip Rafter Depth = 60
Hip Rafter Width = 60```

```
DP Side Claw Line Dimensions

Roof Sheathing Angle

70.93579°

Seat Line for Rafters in Ground Plan Dimension

116.17440

Seat Line for Rafters on Roof Surface Dimension

92.71727

Claw Line #1 Dimension

0.00000

Claw Line #2 Dimension

113.05613

Claw Line #3 Dimension

43.83167

Claw Line #4 Dimension

1.26481

```

Treteaux Angles

R8-DP
Tilted Hip Rafter Slope Angle on DP Side of Hip Rafter.

36.10362°

R9-DP
Horizontal Plane Rotation Angle for Tilted Hip Rafter on DP Line from Footprint to Hip Rafter Run Line.

10.60575°

D-DP
Horizontal Plane Rotation Angle for Tilted Hip Rafter on DP Line from Eave Line to Hip Rafter Footprint

55.98103°

R10-DP
Vertical Plane Rotation Angle from Plumb for Tilted Hip Rafter on DP Line

15.12401°

PSBm-DP
Prism Footprint Saw Blade Bevel Angle Along side of Hip Rafter Rotated into the Roof Surface Plane at Foot Of Hip Rafter

51.34019°

PSBa-DP
Prism Footprint Saw Blade Bevel Angle Along side of Hip Rafter on DP Side at Foot of Hip Rafter

14.87719°

SR4Bm-DP
Prism Footprint Angle in Plan View at Eave Line Intersection

70.60575°

SR4Ba-DP
Prism Footprint Angle in Plan View at Intersection of DP Line and Profile Rafter Footprint Line in Plan View

109.39425°

Drawings with claw line development using the draw down technique.