Bevelling the Triangle Edges
With all 360 triangles now cut out and their edges marked with their lengths (this is essential to avoid disaster later!) I now had to trim each edge of each triangle to a particular bevel angle, so that they would fit together neatly, without reducing the size of the outer face of the triangle. This calls for some very accurate angles and very careful cutting. I knocked up a jig to clamp each triangle in place and hold the router at the desired angle while it trimmed the edge. A little simple trigonometry, a couple of gutter bolts and a vernier calliper allow the angle to be set very accurately. By the way, that's 1080 edges that have to be bevelled to a truely anal degree of accuracy... who's stupid idea was it to build such a complex dome? Gnrrrr....
Dihedral / Bevel cutting jig:
...at a very specific distance from the hinged edge of the jig
using a removable spacer with adjustable screws.
The spacer is then removed...
...the router-slide swung into place and
With all 360 triangles now cut out and their edges marked with their lengths (this is essential to avoid disaster later!) I now had to trim each edge of each triangle to a particular bevel angle, so that they would fit together neatly, without reducing the size of the outer face of the triangle. This calls for some very accurate angles and very careful cutting. I knocked up a jig to clamp each triangle in place and hold the router at the desired angle while it trimmed the edge. A little simple trigonometry, a couple of gutter bolts and a vernier calliper allow the angle to be set very accurately. By the way, that's 1080 edges that have to be bevelled to a truely anal degree of accuracy... who's stupid idea was it to build such a complex dome? Gnrrrr....
Dihedral / Bevel cutting jig:Each triangular panel is clamped down to the work surface...
...at a very specific distance from the hinged edge of the jigusing a removable spacer with adjustable screws.
The spacer is then removed...
...the router-slide swung into place andthe router run across the work piece.
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