Under or over weight?

[sanddrag]

In the end, ours will weight 119.9 lbs. As of right now, our teacher thinks we are overweight and parts will get taken off and functionality will be reduced. I think we are right about there. One thing that worried me is that one "joint" section of our arm is 13 lbs, and we have two of those and that does not include the arm "segments"

Does anyone have estimates on how much all the electronics and wiring will weigh?

[KTorak]

Originally Posted by sanddrag

Does anyone have estimates on how much all the electronics and wiring will weigh?

We weighed our electronics box saturday (we don't have lexan for a mounting board yet) and i beleive it came out to arouind 5-6 pounds (just the standard stuff in the box). But I'd have to double check this week at one of the meetings...

*makes mental note to get a copy of paper listing weighs to put into an excel spreadsheet*

[Sachiel7]

So, far, our Drive/Chassis and what we have of our arm assmebly is weighing in around 63 lbs. I expect to add another 15-20. We will probably reserve the rest for counterweight.

So, um...We'll be under.

[Alaina]

Right now we're estimating our robot to be about 100 pounds.

[mathgeek]

So far our robot is over weight for about 10 pounds. But we probably will solve the problem by drilling holes to reduce the weight of the robot.

[ChrisH]

Originally Posted by mathgeek

So far our robot is over weight for about 10 pounds. But we probably will solve the problem by drilling holes to reduce the weight of the robot.

That's approximately 4200 holes with a 0.5" diameter, assuming the material is 1/8" thick. Better get busy, and I'd get a few extra bits as well.

A better option is to take a close look at your robot and figure out where you have large areas of material you don't need or where you can use thinner material. A spreadsheet listing all of the weights of the parts can be very helpful here. It can identify the "heavy hitters" so you know where to start looking early.

[Holtzman]

Last year at the end of week 4, 1114 weighed in CONSIDERABLY overweight. It was a major setback to say the least.

Bosch extruded aluminum frame, bye bye
hello 1 x 1 x 1/16 square tubing

gearboxes- 1/4" plate was milled out to 1/16 where possible. Drive shafts drilled out down the center. Gears, drilled out. Aluminum hubs made for larger ones. Steel shaft collars replaced with custom made aluminum ones.

Arm - see my signature. Also double chains on shoulder pivot, reduced to one.

turret for arm- it was nice knowing you

ball herding arms- you never had a chance

This year, everything was built ALAP (as light as possible) the first time. Spending even a couple days lightening cuts into invaluable practise time, which can be the difference between a regional championship and a quarter finalist.

[Goobergunch]

The Friarbot mkIII is currently 58 lbs, leaving half the weight limit for the arm that we have yet to fabricate.

[pakrat]

I think we might have found a hard hitter. But we stil aren't sure if we're over...

[JTRULOCK]

right now team 1388 is approx. 20 pounds under weight.

[EOC]

The team 1208 completed (we think) robot is six pounds under weight.

[ghansel]

What robot?

[Andrew Schuetze]

The kitbot transmission and chasiss really helped us out with a fast start on designs and weight. The nearly complete robot is in around 75 lbs. We are very much a single function robot with only a two segment arm at this time. We are using four CIM with a four wheel drive and then a window lift motor with a roller chain gear reduction for the arm. If we add a pnuematic extension to give us more reach we will be over a 100 lbs and closing in on the 120 limit.

[Alan Anderson]

I was concerned today about what I thought was an overly heavy camera "cage". Then I found that the robot had been weighed with all pieces (not all assembled, but all present) and was significantly underweight.

I fear something major has been overlooked, though I can't imagine what.

[Michael Corsetto]

Our "SECRET" drive train this year will weigh around 65-70 pounds so the rest of the team made me swear that my arm would weigh less than 30. I'm just hoping I come somewhere near that goal. So this year team 114 is keeping to KISS, except for the drive train, and electronics box, and grabber... Okay mabe just the arm.