Re: The Bauhaus Helix
Posted by
Todd A Ferguson on
URL: http://c-sng-discussion-forum.254.s1.nabble.com/The-Helix-tp9915p14555.html
If one wants to laminate pieces together and has a lack of clamps it is pretty easy to use drywall screws every few inches randomly placed to act as clamps until the laminated pieces dry. If doing 2 pieces of 1/4 you might want to screw to a thicker piece of 3/4” plywood to keep things flat. I have use this technique to laminate 3/4” wood to 7 inches thick for large window frames. When the laminate dries you simply remove the screws and reuse them...
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On Sep 30, 2019, at 12:53 PM, Pat Student [via C&Sng Discussion Forum] <
[hidden email]> wrote:
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