HemiAdda2d

Spiral helix mocked up, opposite view

Spiral helix mocked up, opposite view
HemiAdda2d, Jan 13, 2007
    • John Warren
      When I first seen this I thought you were doing it the hrd way, but now i see its N. Great woodwork and that is a neat idea. Did you (I'm sure you did) use a bubble on the benchwork to be sure its on a flat plane to get a perfect grade.
      With your helix one can work on any area of it, i like that. ....great work....John
    • HemiAdda2d
      I leveled the entire layout, then I installed the 1/2" ply over the helix module. Then I leveled that. With my uneven floor, this was mandatory.
    • BoxcabE50
      What is the radius of your bottom loop?

      :D

      Boxcab E50
    • HemiAdda2d
      It continuously-decreases. Minimum radius is 16". The top is better than 20" rad.
    • BoxcabE50
      How many pieces per each loop of the spiral? Or is it one solid cut?How many inches between decks? I'm looking at 16-18 for mine.

      :D

      Boxcab E50
    • HemiAdda2d
      I have about 9" rise out of mine, roughly 2 1/4" rise per loop.
      Single piece, 450-inch scroll cut with the jigsaw, talk about sore arms!
    • BoxcabE50
      I was just thinking about the risers. If your benchwork was open grid, and each was screwed to a 1 by 4 in that grid, you could easily make fine adjustments up and down.

      :D

      Boxcab E50
    • BoxcabE50
      If the top loop is 20 inch radius, is your benchwork a full 48 inches wide?

      :D

      Boxcab E50
    • HemiAdda2d
      Benchwork is 42" wide.
      The helix is dead-level, and the helix supports were cut with a bandsaw. That sure made it easier to stay consistent with the grade. The open grid plan is so I can moderate the grade as needed.
    • BoxcabE50
      What is the road bed thickness for your sprals? Looks like 3/4 inch plywood?

      :D

      Boxcab E50
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  • Album:
    D&RGW Secret Places Sub
    Uploaded By:
    HemiAdda2d
    Date:
    Jan 13, 2007
    View Count:
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    Comment Count:
    11