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The things that have been said by Kyle_1881 and asid61
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I'm pretty sure that our team is going with a single lead screw, on account of its low cost and not-much-worse-than-a-ball-screw capability. I have no earthly idea where our lead screws have been ordered from, but the Build Team has told me that it has been done. So that's nice.
We're going to continue assembling the KoP chassis through Saturday, when it will hopefully be done and running (the Programming Team has already written code, the Electrical Team is working on a nice electrical board, and the Build Team has the chassis more-or-less done, though they're still assembling omni wheels and the like.)
Here's a question for y'all (I'm sure you're more experienced than us): We're considering just having the Forklift extend far enough up to allow a second tote to be slid under the first, instead of having the threaded screw extend all the way up to the full height of the robot. If this was done, the robot could still pick up a full stack of totes, because the Clips of Destiny are really cool (see the original post). The big stack of totes inside the robot could still be given ample protection against falling, as well. However, the shorter-screw assembly could not drop off totes on top of other totes. There is a way around this, and that's to grab the entire stack of existing totes, raise them up and slide another tote underneath, but IMO, this is a bit more risky.
So, your $24,000 question* is:
(*$24,000 will not be given to people with a good answer. Sorry.)
Should the threaded screw extend all the way to the top of the robot, or only go a little over two tote-heights into the air?
Thanks!