Pouch motor linear - open soft machines

Basic tutorial for making pouch motor linear.
www.opensoftmachines.com
pouch motor / air / pneumatic
Soft robot / Soft materials / Soft machines
This project is supported by ERATO Kawahara Universal Information Network Project.

[@Ben-gd6wl]

Love the song amigo 🤙

[@aldopereira3649]

awesome tutorial

[@SemperFidelisGames]

Anyone know the name of that device being used?

[@eliahdzx]

i think its called an impulse heat sealer

[@christianmann9237]

Why put crinkles in it? Wouldn't it do the same thing without? Just trying to understand. Videos like this rarely explain the details like that.

[@christianmann9237]

@opensoftmachines

[@jasonlatour3403]

Linear travel is roughly difference between half circumference and diameter of a circle provided that the circle is allowed to form when air is injected. This is not the case when there are no "crinkles". It is nearly the case when there are "crinkles".
Hope that helps :)

[@christianmann9237]

@@jasonlatour3403 is that the case because of the rectangle shape of the pouch, and the multiple pockets change the ratio? Or that the shape makes the rounding expansion perpedicular to the direction it needs to contract in?

[@Anthromod]

@@christianmann9237 So there are several reasons, but yes the rectangular shape of the pouch means that it would not be able to form the maximum deformation (and so contraction) in the desired direction. It would basically inflate like a sausage, but the maximum inflation would limited by the narrow width. Other reasons for the segments include requiring less air volume for the desired contraction. You might also want the muscle to remain somewhat flexible when inflated, which the segments can help with. I've done a few experiments myself in this area using sous vide cooking pouches and sealing with soldering irons and laser engravers.