09-02-2012 12:36

SenorZ

Re: pic: Team 1683 TechnoTitans Base and Ball Collector

Bridge bot? We had trouble with the andymark "8"" pneumatic wheels NOT being 8" and having trouble going over the barrier.

Collector and base look awesome. Very clean.

09-02-2012 12:52

Whateveryousay

Re: pic: Team 1683 TechnoTitans Base and Ball Collector

actually. we can go over the barrier, we just cut the frame a bit, right now we are just 4 and 1/8 inches off the ground, which allows us going over the bump quite smooth actually

09-02-2012 18:11

BlacksmithWoods

Re: pic: Team 1683 TechnoTitans Base and Ball Collector

By the way how was your turning? My team used the pneumatic wheels, and we had a rough time turning so we had to change things up a bit.

09-02-2012 18:38

Whateveryousay

Re: pic: Team 1683 TechnoTitans Base and Ball Collector

Our wheels are center dropped, so we had no problem with turning, we can do a 360 even on the carpet.

09-02-2012 19:04

SenorZ

Re: pic: Team 1683 TechnoTitans Base and Ball Collector

We're doing wide-base 4-wheel and turning is fast. With six wheels you should be immovable.

09-02-2012 19:13

Whateveryousay

Re: pic: Team 1683 TechnoTitans Base and Ball Collector

as i said, center dropped 6 wheels, at any time, we only have 4 wheels on the ground, and we can do 360 even on the carpet, i dont think i will consider that immovable

09-02-2012 23:00

SenorZ

Re: pic: Team 1683 TechnoTitans Base and Ball Collector

Sorry, I meant under the influence of another robot!

10-02-2012 00:16

Whateveryousay

Re: pic: Team 1683 TechnoTitans Base and Ball Collector

oh, i see. But previous years we have been using the same design, we were always one of the best defensive robot at Peachtree Regional, pushing was not an issue for us at all

10-02-2012 00:45

CalTran

Re: pic: Team 1683 TechnoTitans Base and Ball Collector

How's 6 wheel drop working out for aiming? I can imagine the rock would throw off aiming, although I'm not sure how much it would throw it off if you're doing manual instead of automatic

10-02-2012 09:14

Jedward45

Re: pic: Team 1683 TechnoTitans Base and Ball Collector

What is the drop of the center wheel? As a note of caution, our team used a similar setup with 6 pneumatic wheels and a 1/4" drop in the center wheel. We were able to pivot on a dime while testing, but once we added all the weight of other components, we found the compression in center wheel eliminated the drop and made turning almost impossible. (The lateral coefficient of friction on those wheels seems to be rather high) Have you gotten around this problem?

10-02-2012 13:30

Whateveryousay

Re: pic: Team 1683 TechnoTitans Base and Ball Collector

we just encountered this problem, any good suggestions?

10-02-2012 13:58

Jeffy

Re: pic: Team 1683 TechnoTitans Base and Ball Collector

We ran into this last year.
A few solutions-
1.More tire pressure.
2. Shorten the wheel base by drilling a couple of new holes.
3. Change one pair, or both pairs of the outside wheels to something with less friction like KoP wheels.
4. Gear your robot for more torque.

We ran into two problems when we did this. The robot would either refuse to turn, or the robot would execute a bouncy turn.
Refusing to turn usually means you have a long way to go to get it to work. Bouncy turns usually means you aren't far from non-bouncy turns. We deemed the occasional bouncy turn to not be a problem and moved forward.

Best of luck to you.
-Jeff