The included parametric grasshopper file enables anyone to create their own variation of the helical shelf principle. The instructions included are for the version in the photos. This is at first prototype stage and initially I intended for a handle to cause the helices to rotate however there was too much friction so now I lift one of the shelves and this causes the kinetic change and the other shelf moves in the opposite direction. A clasp connects to a hole in the large cog and prevent the shelves from moving from a desired position.
Step 1: Materials/ printed parts
ABS (FDM 3D Printer) download the STL files (also available on Thingiverse) and print (refer to image)
Drill bits (d)40mm, 25mm, 6mm
Selection of files
A x 4
B x 4
C x 4
D x 4
E x 4
F x 1
G x 4
H x 4
I x 4
J x 1
L x 2
M x 1
I will refer to the Key of parts throughout these instructions.
Parts B,C,D,G,J,L need to be filed down for smooth motion.
You may need some washers between parts G and E and I have included various different handles (I used M) My example uses different cogs as well, but you do not need to.
I used plastic weld to glue the parts together (http://www.modelhobbies.co.uk/shop/57ml-plastic-weld-cement-p-26493.html)
3 x 250,600,18mm (refer to image)
W1 x 2
W2 x 1
4 x M6 threaded rod 760mm+
1 x M6 Bolt 60mm
20 M6 Nuts
Thin wood screws approx. 15mm, 26mm
I used the cheapest M6 threaded rod. I think galvanized would be a bit more sturdy.
I used imperial pitch, L Pitch Rubber Timing Belts, (http://www.beltingonline.com/l-pitch-rubber-timing-belts-4582)
I got it cut at 1524mm length 8mm height, glass fibre,