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I've had fun building several tensegrity sculptures and I agree that it makes me very wary about bridges built on the idea. They have very unintuitive propertie

by zcw100 4y ago

I've had fun building several tensegrity sculptures and I agree that it makes me very wary about bridges built on the idea. They have very unintuitive properties that are difficult to appreciate by just looking at them. They appear to be rigid but are actually springy and without pretensioning they are a floppy mess. It seems to be very non linear too with the structure lacking any rigidity as you tension and then snapping into place at the very end. There are some very interesting similarities between tensegrities and bio mechanical structures. I used to think of bones as the scaffolding that holds up my meat parts but it's more like the meat parts and the bones work together as a tensegrity structure.

prionassembly 4y ago
How can I learn to build tensegrity sculptures? Is it something impossible to do without schooling or master-apprenticeship?
- zcw100 4y ago
  You can get started with some rubber bands and soda straws. You just need a lot of patience. That will get you started but there are a limited number of things you can do with that and the rubber bands won't last being under constant tension and will eventually break. It takes a surprisingly small amount of materials, just something for the struts like dowels and some string. The most difficult thing is choosing how to attach the strings to the rods. It takes a lot of adjustment to get the pretensioning correct so you need something that you can change until you get it where you want it.
- monknomo 4y ago
  for a cheap start, chopsticks and twine work just fine.
- Rediscover 4y ago
  Do a search for "tensegrity rods two-nails fuller mailing list" seems to produce a fair number of hits. Also see: An Introduction to Tensegrity by Anthony Pugh, LOC: TA658.2 P85x, copyright 1976, University of California Press, ISDN: 0-520-02996-8 (cloth/hard) or 0-520-03055-9 (paper), 121pp.
- Isamu 4y ago
  It’s a fun puzzle. The main thing is to only connect the ends of the rods to cables and not to another rod. This means the rods are under compression only and the cables carry all the tension. That’s the basic idea. Additionally they tend to avoid the rods even touching, so that it gives more of an illusion of floating elements.
  - zcw100 4y ago
    For something like a rubber band the challenge is that it will tend to pull itself apart before you get the final band attached. For cables that don't stretch the challenge will be it will be a gigantic tangled mess until you tension it. I have no idea how Snelson managed to construct the larger sculptures without killing himself.
twic 4y ago
There is/was a cell biologist, Don Ingber, pushing the idea that cells use tensegrity for their overall structure: https://journals.biologists.com/jcs/article/116/7/1157/27541/Tensegrity-I-Cell-structure-and-hierarchical https://journals.biologists.com/jcs/article/116/7/1157/27541...

by zcw100 4y ago

prionassembly 4y ago

How can I learn to build tensegrity sculptures? Is it something impossible to do without schooling or master-apprenticeship?

zcw100 4y ago
You can get started with some rubber bands and soda straws. You just need a lot of patience. That will get you started but there are a limited number of things you can do with that and the rubber bands won't last being under constant tension and will eventually break. It takes a surprisingly small amount of materials, just something for the struts like dowels and some string. The most difficult thing is choosing how to attach the strings to the rods. It takes a lot of adjustment to get the pretensioning correct so you need something that you can change until you get it where you want it.
monknomo 4y ago
for a cheap start, chopsticks and twine work just fine.
Rediscover 4y ago
Do a search for "tensegrity rods two-nails fuller mailing list" seems to produce a fair number of hits. Also see: An Introduction to Tensegrity by Anthony Pugh, LOC: TA658.2 P85x, copyright 1976, University of California Press, ISDN: 0-520-02996-8 (cloth/hard) or 0-520-03055-9 (paper), 121pp.
Isamu 4y ago
It’s a fun puzzle. The main thing is to only connect the ends of the rods to cables and not to another rod. This means the rods are under compression only and the cables carry all the tension. That’s the basic idea. Additionally they tend to avoid the rods even touching, so that it gives more of an illusion of floating elements.
- zcw100 4y ago
  For something like a rubber band the challenge is that it will tend to pull itself apart before you get the final band attached. For cables that don't stretch the challenge will be it will be a gigantic tangled mess until you tension it. I have no idea how Snelson managed to construct the larger sculptures without killing himself.

twic 4y ago

There is/was a cell biologist, Don Ingber, pushing the idea that cells use tensegrity for their overall structure: https://journals.biologists.com/jcs/article/116/7/1157/27541/Tensegrity-I-Cell-structure-and-hierarchical https://journals.biologists.com/jcs/article/116/7/1157/27541...