Saturday, February 03, 2007

Mostly ramps

The coil springs definitely seem to be working at the joint b/w main and secondary on our 80-20 ramp! (note: depending on the final surface material for our ramp, mounting them may be a little more challenging, but doable, of course).

The dampers are also showing promise; we used some L-brackets to mount them onto our 80-20 chassis and ramp and slowed down the 20 lb ramp significantly (not necessarily enough, but the real ramp won't be 20 lb...). Unfortunately, even with a less significant crash into the floor, the end piece on one of the dampers (with a ball and socket joint) broke. It's still usuable, but this is a problem we have to address.

The mesh seems to be strong enough to hold a robot, provided there is no hole cut out for the ramp release mechanism. If we go with the mesh (possibly two layers of it?), we'll have to:
1) rework the release mechanism (not completely, but I don't think what we currently have will work since it requires a hole...)
2) consider the sag-factor: will the robot stay above 12"? will sag prevent robots from being able to climb up the secondary ramp and onto the main part of the ramp?

To Do:
•plot out location of transmissions and electronics board (keeping in mind the arm has to fit "inside the chassis" at the beginning of each round, before it flips "open" to be in front of the robot)
•consider whether our arm/gripper is going to work with/fit over the black flexible-ish tube on the spider arms
•calc exact distance on either side of robot in home zone when ramps are deployed, and possibly get a max secondary ramp length based on this number
•continue work on ramps: SUPPORTS (either buy hinges from mcmaster or pick some up from ACE; make supports from wood?; cable...possibly buy for crimps for when we need them eventually)
•buy more transmission sprockets if we decided to run two loops of chain from each transmission (one to the middle wheel, and one to the back wheel). (but we don't need any more chain! just possibly some master and half links)
•Mr. Reichling will be here to help construct crate! maybe paint it, too....

see ya! (and don't forget your HOMEWORK :D )

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