pic: Custom drivetrain
 

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OK, I'll bite on this one:

My first thought was "What about bumper supports?"

Re: pic: Custom drivetrain
 

How is the back wheel held in? I see axles and nuts on the front two...

Re: pic: Custom drivetrain
 

Are those stretched-out bike tires?

Re: pic: Custom drivetrain
 

We have already solved the bumper issue, but we want to see if you find any restriction on it.

Re: pic: Custom drivetrain
 

its directly connected to the motor, that is what its holding it

Re: pic: Custom drivetrain
 

yes they are.

Re: pic: Custom drivetrain
 

Might want to show your solution. What I'm seeing is an articulated frame perimeter (something about the tracks being beyond the frame, and forming the perimeter).

Re: pic: Custom drivetrain
 

Cool idea, how well does it work? What size are those wheels? For that matter, what are those wheels? What gear ratio are you running?

Re: pic: Custom drivetrain
 

My first thought upon seeing any novel tank tread solution is to wonder whether the treads are going to fall off the pulleys. In your case, I'm also wondering how much effective traction you're going to have, since you're limited by the metal-rubber coefficient of friction instead of knobby rubber-carpet.

Re: pic: Custom drivetrain
 

Is the entire system running off of just 2 CIMs (1 on each side), and are those planetary gearboxes they're driving (if so, what reduction)?

My biggest concern, in addition to the one mentioned above about getting enough traction, is whether or not you'll be able to turn at all with this. Generally the scrub on a high traction drive requires teams to use at least 4 CIMs on their drive system to avoid stalling their motors when attempting to turn.

Re: pic: Custom drivetrain
 

Have you driven it under full robot weight yet? Usually ~150lbs.

Re: pic: Custom drivetrain
 

I would expect that there is a CIM on each of the front and back "wheels/pulleys".

Re: pic: Custom drivetrain
 

If there is a CIM in the back, it would appear to be driven differently than the one in the front, as there is a threaded rod supporting the back wheel but not the front.

Re: pic: Custom drivetrain
 

It looks like your correct, so if this is the case and it is only 2CIM, then it will be interesting, that means that there is also 1/2 the friction area of the pulley against the tread, that I thought that there was. It looks like a BB 220 gearbox and while it is a rugged gearbox Banebots says " We recommend using a design that supports the end of the shaft", probably isn't a huge problem here as the wheel is close to the face, but something to be aware of

Re: pic: Custom drivetrain
 

That robot breaching defenses might land on that cantilevered wheel, so the situation might be worse than what a normal drivetrain shaft would experience. Depends on if you're planning on going through tall defenses like the rock wall.

Re: pic: Custom drivetrain
 

Excuse me for getting of the topic..
Was the orange box printed? and how?

Re: pic: Custom drivetrain
 

Nope, it was definitely not printed. It was probably just a container they had lying around

Re: pic: Custom drivetrain
 

I'm guessing the orange box is a printer or typewriter cover.

I'm with Kevin on the traction. I had thought at first those were 2008 KoP wheels, but I see they're metal. You probably want to put some sort of rubbery coating like truck bed liner on those.

Unless I'm missing the scale (they look like 8" wheels) or the robot is too wide to get very far up the batter, scrub forces are going to be horrendous.

Re: pic: Custom drivetrain
 

I have serious doubts that this setup can actually move. Like literally, whether it will be able to translate motor power into forward motion.

I really, really hope you've tested this. Your interface between tread and pulley relying solely on friction (and not even having a V-belt interface or anything) is really, really bad as far as treads go. The suggestion to coat the pulleys in something with more friction honestly probably isn't even going to do the trick.

The moment someone T-bones you I don't see how your treads aren't immediately going to derail.

Not trying to be a jerk, just hoping you've already answered these questions so you don't show up to competition and have a season ending "OH SH**" moment.

Re: pic: Custom drivetrain
 

The good news is if this doesn't work out, you're using the AndyMark KOP frame and can make a 6WD pretty quickly... But I'd agree with everyone else here. Run this through its paces at full weight on carpet.

Re: pic: Custom drivetrain
 

Tippy

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Just curious, what is the pneumatic cylinder for? Also, it might be a good idea to put your compressor in your robot.

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I was the coach of my team in 2012 when we proudly posted our robot, and I remember the feeling when people started saying "what about the bumpers?". Fortunately for you, you have a week and a half more than we did to solve the problem. Also take seriously the advice about your tank tread design.

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Brilliant. Good luck with it.

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We do have a V-belt and the pulleys with the proper adjustment. Actually we obtained the belts and the pulleys out of an air-conditioning device. And we have the proper tensors also. IT has been working great so far. Friction with carpet is the only thing that we have not tested but we are looking forward to test it on carpet today.
Also, we will add our bumpers to show it to you.

We know you are not trying to be rude we understand your point. This is Gracious Professionalism. Thank you for that!!!

http://imgur.com/LyEvxeX

http://imgur.com/FSPYEwj

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Ahhh, nice.

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We are using planetary gearbox, and there is no reduction

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What is the ratio in the gearbox (and, also, from the gearbox to the driving point of the robot--this one is often by chain or belt)?

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Wait hang on a minute, so is the planetary gearbox reducing the output speed of the motor?

I sure hope so, otherwise you will have many many problems

Re: pic: Custom drivetrain
 

I don't think you meant to do this, but shades of: http://www.chiefdelphi.com/media/photos/36127