Re: The Bauhaus Helix

Posted by Pat Student on
URL: http://c-sng-discussion-forum.254.s1.nabble.com/The-Helix-tp9915p14553.html

Kieth

The cutting angle is 22.5º.  Adding 48" of tangent to a circle of 30" radius will lower the grade from 2.12% to 1.69%;  adding 60" of tangent will only lower the grade to 1.61% for a helix with 4" TOR to TOR.  For 5" TOR to TOR the grades would be 2.65%, 2.11%, and 2.01%.

I would stay away from laminating 1/4 plywood.  It would need to be clamped with screw action clamps across the width about every 6", clamp centers, and a 2" wide clamp face.  Anything less risks de-lamination and warping.  Also, I've had experience with cutting 1/4" plywood where the pieces  warp, twist or cup.  This is my experience from woodworking shy of using a vacuum bag which does not lend itself to this project.

Would use 1/2" plywood minimum with biscuits to align the ends with blocks outside the track clearance to separate the layers of the helix.

Pat