Quote:
Originally Posted by s_forbes
This is a really neat process, thanks for posting it!
Are you using Buna-N type of o-ring material, or does it have to be some other exotic material for this process to work?
As for the die, how did you decide on the dimensions for the triangular shape and o-ring diameter to use?
|
Thanks. Standard buna-n. Stiffness is dependent on the shore hardness of the
rubber. We modeled the parts in solidworks and then estimated space required. We ended up facing the die about 20 thou to get the compression just right. The V was a standard 90 degree cutter.
Quote:
Originally Posted by Lil' Lavery
What made you opt for torsion axles over other suspension systems?
|
Lightweight, compact, no stops required.
Quote:
Originally Posted by cbale2000
Would anyone care to explain what building this type of axle accomplishes? I think I'm missing something here.  |
This page may help explain everything:
http://www.lovejoy-inc.com/products/...uspension.aspx
Quote:
Originally Posted by asid61
I googled it, and it said that these can be used as suspensions for trucks and the like as opposed to the other method of using leaf springs. That being said I have no idea how these work, although they look really cool.
|
Common on trailers. They are also used in track systems like on skid steers. I believe this video was part of the inspiration.
https://www.youtube.com/watch?v=dIImhJMbc88
Quote:
Originally Posted by sanddrag
I wonder if it's possible to shove one of these together while soaked in alcohol or something, without needing to freeze anything.
|
No. We tried a bunch of methods... pulling, pushing, stretching, and etc. Rubber acts like a liquid under compression. Freezing worked. Liquid nitrogen came from the local welding supply.
Quote:
Originally Posted by Tom Line
I bet a pour-able molding urethane might accomplish this.
|
After reading a few patents it was clear that potting the axle in rubber or urethane wouldn't accomplish the correct motion and tension. We made a very crude prototype from wood and learned exactly how they work. As the square rotates the rubber rods roll tighter and tighter into the corner. The rolling action was key.