[CRUSH-build] lifting with springs

[Bill Bennett]

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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