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Old 04-10-2020, 12:14 PM
crystallographic crystallographic is offline
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Join Date: Dec 2010
Location: Western Sierra Nevadas, Badger Hill, CA
Posts: 4,388
Default Geometry - Helix (Helicoid)

From Wikipedia:


"Helix
A helix, plural helixes or helices, is a shape like a corkscrew or spiral staircase. It is a type of smooth space curve with tangent lines at a constant angle to a fixed axis. Helices are important in biology, as the DNA molecule is formed as two intertwined helices, and many proteins have helical substructures, known as alpha helices. The word helix comes from the Greek word ἕλιξ, "twisted, curved".
(A "filled-in" helix – for example, a "spiral" ramp – is called a helicoid.)"


DNA - single

helical.jpg
DNA - double

DNA_double_helix-.jpg



"Alpha Helix"
https://en.wikipedia.org/wiki/Alpha_helix


"Archimedes screw" shown in operation
http://www.incois.gov.in/Tutor/scien...re10/screw.gif

Auger
auger.jpg

HELICOID

EJDYW0.jpg

P1030993 copy.jpg

CCDM2N.jpg


Helicoid - Spiral stair:
The designer developed his stair section, thus:
Flighted substrate.jpg
Made the shape into a heavy wood mock-up, maquette or "buck."
2X6 + 1in ply glued and screwed, then CNC milled in appropriate router-machine:
AP1110691 copy.jpg


And with some hammering here and there .... boom - whacka-whacka ....
P1030882c.jpg
Attached Images
File Type: jpg external-content.duckduckgo.com.jpg (62.4 KB, 22 views)
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Last edited by crystallographic; 04-10-2020 at 05:43 PM.
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