pic: 955 T-Shirt Bot @ Halftime

[Fe_Will]

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[Jamie Kalb]

That thing looks sick! The middle tube is the firing one, yes?

I'll bet it scared the @#$% out of the other football team!

[PingPongPerson]

I heard that the robot didn't turn that well. I still wish I had gone to the game.

[Fe_Will]

Originally Posted by Jamie Kalb

That thing looks sick! The middle tube is the firing one, yes?

I'll bet it scared the @#$% out of the other football team!

Correct, the outer tubes are tanks and the center tube is the barrel. We can fire one tank or the other, or both at the same time. The biggest issue was the amount of energy required to operate the robot. We simply didn't have enough batteries.

[Andrew Schreiber]

Originally Posted by Fe_Will

Correct, the outer tubes are tanks and the center tube is the barrel. We can fire one tank or the other, or both at the same time. The biggest issue was the amount of energy required to operate the robot. We simply didn't have enough batteries.

What was drawing so much energy?

[Fe_Will]

Originally Posted by Andrew Schreiber

What was drawing so much energy?

Inside there are five kit compressors and four CIMs driving AM 6" mecanums through Banebots 12:1 planetary transmitions. All of the compressors are powered by one battery and the drive, elevation, and controller are powered by the other.

The issue is trying to run the compressors over an extended amount of time. We can fire about three shots at max pressure before the battery is drained. The other issue we didn't plan for was firing when our team scored, it is unpredictable at best and holding pressure for long periods of time means the compressors tend to be "topping off" constantly. Either getting a battery better suited to the job or having a setup where we can keep it plugged in most of the time are the options we are considering.

The other slight issue is that fact that the robot weighs about 275 lbs. It is taxing our drive as is and we are considering changing our gear ratio to 16:1. Adding excessive weight at this point wouldn't help us be mobile

[Andrew Schreiber]

Hmm, 5 compressors, I suppose that would do it. Are you cooling your compressors at all? From my experience in 2008 (my only experience with any sort of pneumatic system) we found that the compressor works much better when kept cool.

Also, and this is something that the electronic people will have to help you with, (by which I mean NOT me, I'm software) what about having 2 or 3 batteries on there? Yes it would increase weight but it would mean you have more energy stored.

And yes, at that weight I would think that the 16:1 would be a great idea, I'd be interested in knowing how hot your CIMs are getting moving that much weight.

One more question, how do the mecanums handle the track? What type of track is it?

[Fe_Will]

Originally Posted by Andrew Schreiber

Hmm, 5 compressors, I suppose that would do it. Are you cooling your compressors at all? From my experience in 2008 (my only experience with any sort of pneumatic system) we found that the compressor works much better when kept cool.

Also, and this is something that the electronic people will have to help you with, (by which I mean NOT me, I'm software) what about having 2 or 3 batteries on there? Yes it would increase weight but it would mean you have more energy stored.

And yes, at that weight I would think that the 16:1 would be a great idea, I'd be interested in knowing how hot your CIMs are getting moving that much weight.

One more question, how do the mecanums handle the track? What type of track is it?

We have 6 fans (3 pulling in air in the front and 3 pushing air out the rear) cooling the inside. There is a good flow going through the unit. We already have 2 batteries in the robot. I would rather find some other type of battery (non-kit) to run the entire system then keep adding more batteries.

The CIM motors do a great job in forward and reverse. Its the power loss when driving sideways that is gimping our movement, we believe. The only issue with the track is the red color so far. Our track is relatively new (about 5 years) and when it is damp the red gets on everything.

[Andrew Schreiber]

Well, then I am out of bright ideas

[Stephen of REX]

No fair, our coaches are too paranoid to allow a robot on the track because of the wheels. Nice design! Our T-Shirt launcher was just made and isn't tested; it is backpack mounted.

[Fe_Will]

Originally Posted by Stephen of REX

No fair, our coaches are too paranoid to allow a robot on the track because of the wheels. Nice design! Our T-Shirt launcher was just made and isn't tested; it is backpack mounted.

The trick is to get your administration excited about it. You could only imagine the look on our athletic director's face when the principal told him at the last minute that he was providing the shirts at the football team's expense.

[wilsonmw04]

what are you using as your valve? I would be very curious to see a closeup of it and/or parts numbers.