Thread: Surgical tubing stretched too far
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Unread 11-03-2014, 07:28
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TheKeeg TheKeeg is offline
Michigan Tech Engineering
AKA: Keegan Harrington
FRC #0068 (Truck Town Thunder)
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Join Date: Jun 2012
Rookie Year: 2013
Location: Ortonville, Michigan
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Re: Surgical tubing stretched too far
Quote:
Originally Posted by nixiebunny View Post
We have a catapult powered with surgical tubing on our bot. The tubing is stretched from about 5 inches untensioned to about 20 inches as the winch pulls down the catapult arm. That's a 300% increase in length.

During the Hub City regional, we suffered from frequent decreases in shooting power and had to re-tension the tubing several times over the three days, and we ended up replacing some of it. I suspect that the tubing is being stretched past its elastic limit. It displays "stretch marks".

We can modify the bot's superstructure to allow for a much longer untensioned length on the tubing, reducing the extension from 300% to about 100%. Does this sound like it will solve the tubing over-stretching problem?
Go with spear gun tubing...the stuff is great.

http://www.amazon.com/Speargun-Sling...peargun+tubing
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Keegan Harrington
Truck Town Thunder
2013-2014: Mechanical Design

"Infinity: you empty out all of the coffee and there is still more orange juice"