pic: Custom drivetrain

[pilleya]

Originally Posted by cbale2000

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.

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

[cbale2000]

Originally Posted by pilleya

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

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.

[pilleya]

Originally Posted by cbale2000

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.

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

[Chak]

Originally Posted by pilleya

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

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.

[Tal_Esh]

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

[pilleya]

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

[GeeTwo]

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.

[Cory]

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.

[Ryan Dognaux]

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.

[roystur44]

Tippy

[hectorcastillo]

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

[Humberto fig]

Originally Posted by Cory

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.

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

[MoistRobot]

Originally Posted by Humberto fig

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

Ahhh, nice.

[mrnoble]

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.

[Bertman]

Brilliant. Good luck with it.