pic: Rachel climbs a tree... 1018

[Denman]

that lifting arm must weigh a ton!
it looks like its bending a little though...
evidently you can reach at least 10 foot, have you ever fallen over?

[tiffany34990]

how fast does the arm go up???

and how heigh does your ceiling go up???

great job though again

[Bob Steele]

Originally Posted by tiffany34990

how fast does the arm go up???

and how heigh does your ceiling go up???

great job though again

The arm goes up relatively fast. We have some difficulty with a tetra getting to the complete height. We will try to optimize that at the regional. But it has gotten high enough to cap a tall goal with 3 tetras on it..( that is the design parameter) The ceiling in that room is around 15 feet or so... It is the only room we could test it in...smile

As far as bending is concerned... the runout on the arm isn't more than about 2-3 inches at full extension... but we will rarely extend it fully either...it is designed to be used at about 2/3 extension...at that point the runout isn't more than half an inch or so...

[Bob Steele]

Actually the arm (the horizontal portion) only weighs about 16 lbs. (including the hook and the motor) We don't intend to drive around much with it all the way up in the air. The whole robot weighs in at slighty less than 119 lbs.
The tower and the drive train are NBD... (Nothing but Dewalts...)
Chip motors with Dewalt transmissions... We used a globe motor and a rack and pinion system to move the tower arm...

I believe that the entire robot is simple but quite elegant in its design approach.

thanks
B

[Stu Bloom]

Originally Posted by Denman

that lifting arm must weigh a ton!
it looks like its bending a little though...
evidently you can reach at least 10 foot, have you ever fallen over?

Our final weight is right on target. The tower secitons are cut from .100 thick aluminum sheet and weigh about 10.5 lb each. The arm is another 16 pounds. The tower is raised by one CIM/Dewalt combo using cascading style cables, and the arm is operated by a globe motor with a rack and pinion arrangement. The tower raises to full height (13 feet to the top of the arm) in 4-5 seconds.