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Unread 09-05-2013, 21:05
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FRC #1718 (The Fighting Pi)
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Re: 233 telescoping arms how do they work?

Quote:
Originally Posted by CENTURION View Post
Ah, okay, yeah we used a cascade like the 233 one you describe in 2011 to raise/lower tubes.

Yeah, the nesting sounds very hard to do. Maybe if I get bored over the summer I'll CAD up something
The nesting is only really difficult if you want to put it into a very small package. Pink's arm and Poof's variation show true engineering elegance in packaging, from the wide rollers to the usage of belt (low profile) to the threading of the linear springs through the system.

The question that you'll also have to answer is the orientation of the constant force springs. Do you use them to extend the arm and only pull one way with your motors? Do you use to retract the arm so they help you lift the robot, but power the arm in both directions?

It's a really awesome design that I wanted to understand to put it in our 'toolbox'.