this is actually from two 4'6" lengths of 3x1" tubing that are tiers on our bot. We did these week 3 I think on our big old mill.
We saved about 4 pounds. (there is a bunch of other stuff under the aluminum. there is only a 2 foot cake of it. Its kinda cool because it all sticks together!)
**sigh** we took apart the box for plywood, victors, and CIM's
So, come Saturday before Shipday, we were 10 pounds overweight (and we thought we were keeping track very well!) so we ditched our 2 globe motor tranny for our manipulator, replaced it with a CIM from our Omniwheel drivetrain, and took a sawzall to all of the extra bolt ends.
We are now just barely making weight and use only 4 CIM's on our bot.
our drivetrain has 5 omniwheels now and is essentially 4wd with omniwheels and an extra wheel to turn (turns almost as well as castor drive last year
).
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-Vivek
p.s. I will get pictures up as soon as I can of the bot.