pic: Team 254 2006 Robot 1

[henryBsick]

Originally Posted by Veselin Kolev

I think they're only using two CIMs for drive now.

Ah, my mistake. Regardless... I have not seen a CIM stall in FIRST. EVER.

Originally Posted by Tom Bottiglieri

Yes, but if both bots are able to put the power to the floor (with all these traction wheels floating around, the tables are a little more even), that FP will give you a boost. Not to mention the increased efficieny in acceleration.

I disagree. If both robots have the same amount of traction, the bot with more ability to turn the wheels will do just that, turn the wheels. A slightly mocked down version of burning out. I believe the lower RPMs help in a situation like that, putting more grip to the floor. Plus the higher load CIM is running more efficiently.

Just for the record... adding motors normally does not increase pushing ability, just range of top speed.

[Cory]

Originally Posted by Henry_222

Just for the record... adding motors normally does not increase pushing ability, just range of top speed.

It most certainly does increase pushing ability. More motors means more torque, which as long as you haven't exceeded friction*Normal Force means more pushing ability.

If you meant to say it increases pushing ability at higher speeds, you'd be correct, but it definitely does not increase the top speed of the robot.

[henryBsick]

Originally Posted by Cory

It most certainly does increase pushing ability. More motors means more torque, which as long as you haven't exceeded friction*Normal Force means more pushing ability.

If you meant to say it increases pushing ability at higher speeds, you'd be correct, but it definitely does not increase the top speed of the robot.

I really am getting into a bad habit of not thinking things through, sorry. I meant it gives the potential for a higher speed. More torque due to more motors leads to the ability to turn a higher gear ratio resulting in a higher output speed.

More motors does mean more torque, but if you aren't reaching stall torque to begin with, what is the point of adding more torque? It doesn't improve anything in said situation.

[sanddrag]

Originally Posted by Henry_222

More motors does mean more torque, but if you aren't reaching stall torque to begin with, what is the point of adding more torque? It doesn't improve anything in said situation.

It is quite easy to reach the limit of the electrical system, thus tripping breakers. More motors means lower current draw per motor since they are sharing the load.

[henryBsick]

Originally Posted by sanddrag

It is quite easy to reach the limit of the electrical system, thus tripping breakers. More motors means lower current draw per motor since they are sharing the load.

Where was it mentioned that team 254 had breaker problems with the single CIM per side setup? Another thing I have never seen in FIRST although very possible. I remember back to 03 though, those drills would trip 40's regularly

[sanddrag]

While they didn't mention it, I can't see how they wouldn't. With a high gear of 15 fps and a COF of probably 1.1 or 1.2, and a stall current of over 100 amps, it would be next to impossible to not trip a breaker. Perhaps if you never encountered an obstacle. But as soon as you came up against another robot. Low gear will help, but it still may be possibel to trip it. I don't know. I could runt he numbers but I have no immediate desire to because more is merrier when it comes to motors.

[henryBsick]

Originally Posted by sanddrag

While they didn't mention it, I can't see how they wouldn't. With a high gear of 15 fps and a COF of probably 1.1 or 1.2, and a stall current of over 100 amps, it would be next to impossible to not trip a breaker. Perhaps if you never encountered an obstacle. But as soon as you came up against another robot. Low gear will help, but it still may be possibel to trip it. I don't know. I could runt he numbers but I have no immediate desire to because more is merrier when it comes to motors.

Sure it would, 15 fps is outrageous for one CIM/ side to handle well. But when we are talking about pushing and low gear, I hold my claims to be true.

[Adrian Santos]

Amazing machine, guys...makes me want to come out of retirement

Good luck this season, and I'll be at SVR to see this monster in person.

[sanddrag]

Timmy: Mama, Mama. I want a blue one!
Mama: No Timmy. You can only have a red one.

[nuggetsyl]

is there video???

[Bob A]

Dave - sometimes you are just SOOOO picky, picky, picky...

I'd be happy to have one in red, black, blue or whatever! But why settle for just one - let's make it two (or three, or four...)!

[Travis Covington]

I've always liked the blue... But red will do too, if that's your thing.