Hello guys! I’m revealing my team’s V7.5 bot, which won the New England Championship this past weekend.
[ATTACH]7290[/ATTACH]
Stats:
Approx. 15-17 lbs in weight
4 motor drive, 393’s in high speed mode
2 motor lift, 1:7.5 Lift’s ~15-17 sacks
4 motor intake
This robot ranked went undefeated for the entire tournament, going 6-0 in qualifications and 6-0 in eliminations. It ranked 1st of 72 teams, and won driver skills with a score of 270, which is the 2nd best run recorded in the US to date. The Finals 1 Match can be found here : Northern New England Finals Match 1 - YouTube
Here is the video of the run : [
Finally we won the Think award for my programming. Two of the key features that won me this award was my nicely formatted PID controllers and my filters for the sensors. I will likely reveal that code after worlds.
I have a question about the super-traction wheels.
We were just watching your robot drive around during Robot Skills, and you seem to be turning just fine. Really well, even. Can you give us an idea of how they compare to the use of four Omni Wheels?
We’re using strictly Omni-Wheels for mobility on our robot, but we’re always looking for ways to get a bit more pushing ability. But is there a reduction in speed or turning ability?
During driver skills we actually switch to all omni’s because they’re a bit more mobile. The Traction wheels don’t reduce forward/back speed whatsoever but the turning speed is reduced a bit. In reality the difference is pretty minimal, but it really depends on your robot and how you want to play the game.
None at all. The traction wheels have never gotten stuck, practice or match, on sacks. Any problems in terms of getting stuck has been on the small omni’s in the front, which even that is pretty rare.
Thanks! They are carefully tuned so that when they are pushed back, even the slightest vibration is enough for the wheels to push out and deploy. I tend to use the white spacers in the back as some upwards friction to help them stay in place as well.
I’m not exactly sure how many I use… normally I tune each side interdependently, so it’s likely there are 1 or 2 more on either side, depending on the specific motor I’m using or the amount of friction in the lift. I would predict around 15. Normally when I tune the lift I, I try to make sure it naturally hovers a few inches above the ground, that way it doesn’t require too much power to keep it down, but also allows the lift to lift more.
The only problem I’ve confronted with 2 motors is that they tend to burn out a lot easier then 4 motors. I was able to offset this problem with just driving practice, as most of the time I was just trying to lift too many sacks then the lift can handle, and always having fresh batteries during matches.
Its stiil pretty impresive to lift that amount of sacks with just 2 motors on that gear ratio, plus the 4 motor intake helps a lot when it comes to descoring and intaking a big pile of sacks.
Does the wheely bar come out when the robot drives forward? Or does it have some kind of lock that comes off when moving the lift?
Thanks!