Sheet Metal Fabrication vs. Using Channel

[TheModMaster8]

Originally Posted by asid61

Why would you have to move the COM higher?

when reducing weight of your foundation you cause it's COM to be to a heavier side, so if i take weight off the bottom and add it to the top i now have a pendulum

it's due to that fact that your weight lemit is 120 so by reduce your chassie weight by 20 pound and now you added it to the top of the robot, you will be more likely to have more mass at the top of the robot and is more likely to tip/flip

if this needs further explanation I'll reply when it's not 2:14 AM lol

[carpedav000]

Originally Posted by TheModMaster8

when reducing weight of your foundation you cause it's COM to be to a heavier side, so if i take weight off the bottom and add it to the top i now have a pendulum

it's due to that fact that your weight lemit is 120 so by reduce your chassie weight by 20 pound and now you added it to the top of the robot, you will be more likely to have more mass at the top of the robot and is more likely to tip/flip

if this needs further explanation I'll reply when it's not 2:14 AM lol

I can only see this being a problem if you have a tall robot (above 60" or so)

[cad321]

Originally Posted by carpedav000

I can only see this being a problem if you have a tall robot (above 60" or so)

All he is saying is that if you take weight from the chassis and put it into a system that is even half an inch higher, you have raised your COM. Depending on your robots design, this may not be an issue.

[carpedav000]

Originally Posted by cad321

All he is saying is that if you take weight from the chassis and put it into a system that is even half an inch higher, you have raised your COM. Depending on your robots design, this may not be an issue.

Oh, okay.

[Deneb]

It would depend on the game more or less. Sheet metal allows much more flexibility in shape to allow the robot to better fit the game piece(s). If it's a game heavy in defense, I would want the sturdiest bot on the field to withstand pushes of other bots and push others with ease, not having to worry about any weak points whatsoever.

[Gregor]

Seeing lots of generalizations here such as "sheet metal is lighter than tube" and "sheet metal is weaker than tube" ect. ect.

Both sheet metal and tube's weight are totally dependant on how you use them.

[Abhishek R]

Originally Posted by cad321

All he is saying is that if you take weight from the chassis and put it into a system that is even half an inch higher, you have raised your COM. Depending on your robots design, this may not be an issue.

Well, yes, but you could just lose the weight completely and not even put it into a different system. You would just end up with a lighter robot in general.

[Qbot2640]

Originally Posted by Abhishek R

Well, yes, but you could just lose the weight completely and not even put it into a different system. You would just end up with a lighter robot in general.

...and then, if you are concerned about being at maximum weight (perhaps you want to maximize traction) you have the ability to put additional weight exactly where you want it to create the best result.