pic: Collapsed Elevator

Just a practice elevator I made over winter break, based off fo 973’s 2011 offseason robot. Much thanks to Adam Heard and 973 for the RAMP videos!

CAD is available here: https://drive.google.com/file/d/0Bx6dgMkncv-3dXU3UUVtQWdBSkU/edit?usp=sharing

Like the honeycomb lightening pattern. Very 33-esque.

The hex reminds me of the VEXU NAR team.

I assume there are points on the rigging that are attached to make this go up and down? :stuck_out_tongue: It looks like on the bottom of the first moving stage and then the top of the cross bar for the carriage? Also wouldn’t you be able to make this with one continuous loop of rigging versus one closed loop and one powered loop attached to the spool?

Seems to have a 469-vibe coming from it.

The two anchor points are to the bottom of the first stage, as you said, and then to the crossbar at the top of the stationary stage that you can see in the other picture.

This is a variation of a cascade rigged elevator, which had a continuous load on the lift string, unlike a continuous elevator, which makes control loops a bit easier. However, with a traditional cascade elevator, the return string comes in twice as fast as the string lifting the elevator, so the spool needs to have two different diameters. With this setup (two separate loops), you get the benefit of the constant load of the cascade with the single diameter drum of the continuous, with the disadvantage of a bit more complex rigging system.

There’s a bit more information in this thread (along with the diagram from Jared341 which inspired this rigging method): http://www.chiefdelphi.com/forums/showthread.php?p=1201847#post1201847

Glad we could help!

I’ll note that the pulley mounts that were shown as riveted in in our model would likely eventually fail. After two offseason events in the 2011 game w/ a 15 lb claw, they’ve lifted about 1/16" on one end. Rivets don’t like tension so we figured this would eventually happen.

For a bulletproof connection during season I’d bolt through the tube and either use a large washer (or backing plate) or some crush tubing.