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Unread 21-01-2015, 09:36
Orion.DeYoe Orion.DeYoe is offline
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Re: pic: 4242 Preliminary CAD 1

Quote:
Originally Posted by K-Dawg157 View Post
You have a valid point, programmer.

It would all depend on the material being used, and the orientation it was being used in. Also, how high the support from the back is up the side rails would be important.

I did some calculations with an engineer, and we figured it out that the maximum load the robot (assuming 6 tote or 5 tote bucket and noodle capabilities) would be holding, cantilevered at 6' in the air, would be ~400 foot pounds...

Make sure your material is all good and the supports will hold it and you should be set.
Um... You need to check those numbers...
The load is not cantilevered the height of the elevator. The number you should be using for your moment arm is the horizontal distance from the center of the carriage to the COG of the load (something like 12-16 inches). Multiply that distance by the weight of the load (60 lbs we'll say) and you get something like 720 - 960 in*lbs (60 - 80 ft*lbs).
It appears everything is made from 1x1 8020 extrusion. It's pretty beefy stuff and the elevator appears well-supported. I wouldn't anticipate anything horrible happening to it.
I probably would make the carriage taller though (as someone else mentioned).
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Thanks for your time,
Orion DeYoe

FRC Team 2252 "The Mavericks" 2011-2014 (Student)
FRC Team 5413 "Stellar Robotics" 2014-???? (Mentor)

2011: Drive Coach, CAD, Programming, Electrical
2012: Drive Coach, Team Captain, Team Representative, CAD, Programming, Electrical
2013: Drive Coach, Team Captain, Team Representative, CAD, Programming, Electrical
2014: Drive Coach, Strategy, CAD
2015: Team Founder, Design/CAD Mentor, Drive Coach
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