Riding Up On Balls

It looked like a lot of teams were having problems with this at the regionals this past week. What solutions did it look like good teams employed?

I would say your best solution is having a low ground clearnace, and enclosed tires.

Ya. Alot of the teams, I noticed, that were riding up on balls were the teams that had those big tires in the front.

I didnt really see this problem, with the exception of one or two teams, and I watched all of Portland and VCU’s elimination rounds, as well as most of Portland yesterday afternoon.

However, I do agree with Tyler, if you do find yourself riding up. Another solution would be to angle small pieces of metal forward and down, like a wedge, but not from the top of your bot, just from the bottom down to near the ground, which would help to keep balls from jamming under.

Cory

Thats true.

It looks like a lot of teams are using rollers. Is that any good?

From what you saw, the NJ regional was completly opposite. At least every other match, a robot was found on top of a ball. Most of the times, they got back off, but other times, they fell over. (that was also a problem) The ball under the bot thing happend usually when a team was trying to get onto the ramp, or, when they drove back off the 6 inch platform to come back down.

me and another kid on my team had made a roller in the back so that we wouldn’t ride over a ball… i’ll try to find a pic of it.

Found one…
http://websterschools.org/webpages/roboticsfirst/photos/16121//Large_CIMG0407.jpg
the time in the backround is in the morning of the ship day

there are a few other pics on the website too www.gosparx.org

At BAE, we found that whenever we drove into a ball with our front end (Tri-Star wheels) we would push it, but when we drove into a ball with our back end (6-in wheels) we would ride over it. Odd, considering each end is at the same height, frame-wise, and well under the equator of the ball. Twice we popped balls doing this.

What are your hooks made out of?

do you have pictures of your bot with the tri stars?

(dont know how to spell it) Conduct piping

Not necessarily. Thats what our team thought. We have <1 in ground clearance and enclosed tires but we got stuck on balls several times :mad: we added a bumper (thanks to team 42) for elimination rounds but had power issues before we could see if it actually worked. Hopefully it will work for nationals.

Tranny for cd.JPG


Tranny for cd.JPG

It is true that this doesn’t guarentee you to not ride up on balls. Our bot from the 2002 year in the Einstein finals drove up on a ball and oru ground clearance was 3/16".

We saw this problem the first time we played with the balls for this years competition. So to take it into play in our design, we made our wings to gather balls very low to the ground and we also put rollers on the wings and face of our bot to deflect the balls when they hit.

we also have rollers on the front “kicker bar” so we could hit them and not go over them in the front… heres a pic
http://websterschools.org/webpages/roboticsfirst/photos/16121//Large_CIMG0390.jpg

We rode up on balls twice at VCU, but we just articulate our chassis and we’re off. It’s actually very cool.

great job 33!! after u got stuck did u suck those balls up and throw em in the goal?