[CRUSH-build] lifting with springs

[Lamar Flake]

Bill, I must admit that is VERY good forethough... Good job. :)


>From: "Bill Bennett" <bill at wizardofaz.net>
>Reply-To: build at crush1011.org
>To: <build at crush1011.org>
>Subject: Re: [CRUSH-build] lifting with springs
>Date: Wed, 10 Jan 2007 18:14:26 -0700
>
>I ordered 3 motors, 3 transmissions, 3 shaft encoder kits, 2 speed 
>controllers, and 2 clippard accumulator cylinders (they're free). I figured 
>there might be a run on the transmissions, wanted to get them before 
>they're gone. The third set of the first three items is for bench 
>prototying, software debugging, classroom use, etc, as well as being a 
>spare if we need it.
>
>Bill
>   ----- Original Message -----
>   From: Michael Eckelbarger
>   To: build at crush1011.org
>   Sent: Wednesday, January 10, 2007 2:43 PM
>   Subject: Re: [CRUSH-build] lifting with springs
>
>
>   They are only about $16 ea from McMaster-Carr  maybee we should buy a 
>couple when we order the sprockets.
>   We also need to order the motors & Transmissions.
>
>
>   On 1/10/07, Bill Bennett <bill at wizardofaz.net > wrote:
>     This gives example information for the extension rate for an unloaded 
>spring. Would be interesting to see a curve of the extension rate as a 
>function of load, so we could compare the loaded to unloaded rate. We want 
>the loaded rate to be fast enough (reasonable amout of time to lift at end 
>of game) and the unloaded rate to be slow enough (safe).
>       ----- Original Message -----
>       From: Michael Eckelbarger
>       To: build at crush1011.org
>       Sent: Wednesday, January 10, 2007 10:30 AM
>       Subject: Re: [CRUSH-build] lifting with springs
>
>
>       Here is a good explaination.  (see attached PDF)
>
>
>       On 1/10/07, Bill Bennett <bill at wizardofaz.net > wrote:
>         One of the ideas we're discussing is lifting the partner's robot 
>with springs, for example, nitrogen filled gas shocks like are used in car 
>trunk lid lifters. We'll have to understand how these are controlled, since 
>if the lift is released with no load (no robot on it), it will still have 
>to rise safely. Can we get one to study this?
>
>         Bill
>
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