Quote:
Originally Posted by Hawiian Cadder
my concern is that once it gets over the top
A. you wont be able to retract it back to forward safely.
B. you will tip over.
C. it may destroy the window motors.
D. if it goes over you probably wont be able to move.
the window motors in a winch makes it impossible to actuate once it goes to the other side.
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A: Quite possible, with the pictured setup.
B: I
highly doubt it. Just because you guys may have does not mean that that is necessarily true. CG plays a role. I know 330 was able to reach back in 2005, 2007, and 2008. We didn't do it--except to
self-right--but if we had reached back, especially in 2007, with a light load, I doubt we'd have tipped (2008 and 2005, we'd simply have self-righted if we had).
C: If you seize up the gearbox, maybe. I'm not sure there'd be enough force left in the cables to do that after they stretched.
D: Almost correct, except that maybe you mean "move backwards" or "turn". Forwards probably wouldn't be too bad of an issue.
A number of things would depend on how the winch system worked--if it was set up as shown in this picture, then yes, there could be a problem near the top. If, however, it was run to a pulley on the side of the arm, and wrapped such that it was a continuous pull on either side, or had some other form of pull on the main arm side, then I don't think there would be a problem.
With this setup, I'm pretty sure that the worst thing would be the arm not being retractable if it went over the top of the robot.
For the team, I'd suggest running an extra cable off the front side of the winch to the arm, at about the same distance from the pivot as the one shown, but running out when the arm goes up. That should take care of the arm going over backwards on you.