1. 3 years ago

    Paul T. 27

    22 Apr 2012 Worcester, MA

    Since Bridge Battle 2.0 (sack Attack) now introduces a new element into the vex mix; the sack, which is both a game element but also an obstacle for robots to navigate around. our standard 4 wheel drive trains may not be great overcoming the sacks and may result in robots getting easily stuck so i was thinking what is the most innovative way to overcome the challenge and this poped in to my head along with some other options but nothing that radical so i was wondering what ideas people have for not getting stuck on the sacks (an obvious approach would just design you chassis so the only thing to go below 3 or 4" of your bot is the wheels and manipulatior)

    What are your thoughts?

  2. Are coming back into VEX to compete this year? I think that could work. It would have to be perfectly set up though.

  3. tutman96

    22 Apr 2012 Duluth, GA 675A

    Why would you need to drive over the sacks. Just pick them up.

  4. Paul T. 27

    22 Apr 2012 Worcester, MA

    @vexengineer98 Are coming back into VEX to compete this year? I think that could work. It would have to be perfectly set up though.

    I may, but i don't think its likely, i don't have a team or the resources to start my own but you never know what the future holds. I think its a very possible solution but not really practical but I'd love to see someone build one

  5. davepowers

    22 Apr 2012 Worcester, MA NAR

    It would work, but seems irregularly unsteady and might be a pain to turn quickly and fluidly. It would sure be a head turner though.

    -D

  6. Owen

    22 Apr 2012 Burlington, VT BNS/BERN

    I would say either raise up your chassis so that enough wheel is exposed to climb and drive over the sacks, or have it really low to the ground with some sort of plow. Legs could work but I'm not sure how practical they would be. Maybe something like this ? Although I'm not sure how well they would work as wheels with a heavy robot.

  7. Paul T. 27

    22 Apr 2012 Worcester, MA

    @tutman96 Why would you need to drive over the sacks. Just pick them up.

    Lets say another team pushes some near the back of your bot and your facing a wall or your bot is at full capacity as it is or whatever reason it would be nice not to have to worry about getting your bot stuck during the match

  8. Paul T. 27

    22 Apr 2012 Worcester, MA

    @davepowers It would work, but seems irregularly unsteady and might be a pain to turn quickly and fluidly. It would sure be a head turner though.

    -D

    yeah but the head turner would be enough reason for me to try it haha #RebuildRonny

  9. Paul T. 27

    22 Apr 2012 Worcester, MA

    @Owen I would say either raise up your chassis so that enough wheel is exposed to climb and drive over the sacks, or have it really low to the ground with some sort of plow. Legs could work but I'm not sure how practical they would be. Maybe something like this ? Although I'm not sure how well they would work as wheels with a heavy robot.

    the wheels being raised would probably work best but its a concept and maybe if you do it right you can get some awards and such

  10. Ryan Dognaux

    22 Apr 2012 St. Charles, MO 0000

    Some of our students already created a mecanum drive in light of our FRC robot to have a passive suspension that allows the back (or front) wheels to pivot in tandem, allowing the robot to drive over uneven terrain. A few photos were posted here: http://www.vexforum.com/showpost.php?p=266449&postcount=126

    Once we get our sacks we will post video of us attempting to drive over them as we have no idea how well this will actually work on the sacks.

  11. raygunpanda

    22 Apr 2012 Omaha, Nebraska, USA 6813M

    @Paul T. 27 the wheels being raised would probably work best but its a concept and maybe if you do it right you can get some awards and such

    it could be an opportunity to use vex suspension from the gallery:
    http://www.vexforum.com/gallery/files/9/6/4/6/dsc00829.jpg

  12. Building a Ripsaw would work.
    http://dsc.discovery.com/videos/howe-and-howe-tech-ripsaw/
    Opposing robots won't be an issue either.

  13. AndrewRemmers1902

    22 Apr 2012 Orlando, Florida NAR

    @DiodeTech Building a Ripsaw would work.
    http://dsc.discovery.com/videos/howe-and-howe-tech-ripsaw/
    Opposing robots won't be an issue either.

    Pneumatic Tread tensioner anyone? ;)

  14. Paul T. 27

    22 Apr 2012 Worcester, MA

    @raygunpanda it could be an opportunity to use vex suspension from the gallery:
    http://www.vexforum.com/gallery/files/9/6/4/6/dsc00829.jpg[/url]

    i actually built one of those last summer, if you get the elastics tensioned properly it's great (it got right over the round up rings i was playing with)

    @DiodeTech Building a Ripsaw would work.
    [url]http://dsc.discovery.com/videos/howe-and-howe-tech-ripsaw/
    Opposing robots won't be an issue either.

    Pneumatic suspension that could lower the bot to fit under the bridge, sounds awesome

  15. @Paul T. 27 Pneumatic suspension that could lower the bot to fit under the bridge, sounds awesome

    Unlike gateway, I did not see a rule saying we can't go over the bridge.

  16. AndrewRemmers1902

    22 Apr 2012 Orlando, Florida NAR

    I didnt mean in a form of raising and lowering the robot that would create complex messes of stuff you dont want to deal with. What I was saying was WHAT IF you used a piston with a sprocket on the end of it to tension chains/treads have it always charged so it adapts to the treads slacking and tightening.

    Just a thought

    - Andrew

  17. raygunpanda

    22 Apr 2012 Omaha, Nebraska, USA 6813M

    @DiodeTech Unlike gateway, I did not see a rule saying we can't go over the bridge.

    yeah you have fun with that :rolleyes:

  18. Paul T. 27

    22 Apr 2012 Worcester, MA

    @AndrewRemmers1902 I didnt mean in a form of raising and lowering the robot that would create complex messes of stuff you dont want to deal with. What I was saying was WHAT IF you used a piston with a sprocket on the end of it to tension chains/treads have it always charged so it adapts to the treads slacking and tightening.

    Just a thought

    - Andrew

    yeah but it wouldn't be that complex if you did it right (i may make a cad model of a chassis that can lower its self) and that idea was on the FRC "Next Year" list (if we arn't forced to use belts haha)

  19. @raygunpanda yeah you have fun with that :rolleyes:

    I think Grant's vex robot could handle the bridge.

  20. Paul T. 27

    22 Apr 2012 Worcester, MA

    @DiodeTech Unlike gateway, I did not see a rule saying we can't go over the bridge.

    good concept but just a little over the top if you ask me.

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