[archiver]

Posted by Dodd Stacy at 1/30/2001 8:58 PM EST


Engineer on team #95, Lebanon Robotics Team, from Lebanon High School and CRREL/CREARE.


In Reply to: Bridge force chart
Posted by Ken Leung on 1/26/2001 7:31 PM EST:



: Here is what our team's field expert Andy lee found out about manipulating the ramp:

: (the -'s are just for spacing)
: Data set one: An unloaded ramp.

: Inches froms pivot point----Static mass required to ----------------------------change posistion(lbs).
: ----------------------------Slanted--------Balanced

: 12--------------------------30--------------80
: 24--------------------------15--------------30
: 36--------------------------10--------------15
: 48--------------------------5---------------10

: Data set two: Loaded with 260Lbs of robot(105bls), goals(70lbsx2), and balls(black 1lbsx10 each & one big 5lbs)

:
: Inches froms pivot point----Static mass required to ----------------------------change posistion(lbs).
: ----------------------------Slanted--------Balanced

: 12--------------------------170--------------80
: 24--------------------------50---------------30
: 36--------------------------30---------------15
: 48--------------------------25---------------10
:

: Force to hold a goal on the ramp while tilted = 10 Lbs
: Constant force required to pull the goal up the ramp = 20 lbs
: Force to pull the strecher up the ramp = 30lbs

: These are all approximate values due to the dynamic nature of the system.

Ken,

Thank you and your team for generating and posting the bridge force data set. What I find quite interesting is that the force at each point to tip a balanced bridge is the same whether the bridge is empty or loaded with a robot and two full goals.

It doesn't look like dragging a couple of goals up with the bot is going to make it any less twitchy to balance!

Dodd