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Unread 15-01-2010, 08:30
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Re: pic: Ramp Video

Joe, it seems to me that as the middle wheel goes up, the outer wheels go down. Wouldn't this cause the bumper height to change? Bumpers must remain in the BUMPER ZONE, 10-16" off a level surface.
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Unread 15-01-2010, 08:34
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Re: pic: Ramp Video

Quote:
Originally Posted by GaryVoshol View Post
Joe, it seems to me that as the middle wheel goes up, the outer wheels go down. Wouldn't this cause the bumper height to change? Bumpers must remain in the BUMPER ZONE, 10-16" off a level surface.
Key phrase--"level surface". If the robot is set up on a level surface, are the bumbers in the bumper zone?
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Unread 15-01-2010, 17:56
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Re: pic: Ramp Video

You also have to watch out for your max height.

Don't make the robot 5 feet above the frame, make it 5 feet above the wheel at the lowest point.

How they would test this in the box.. I don't know.

But still, ask the Q&A if you guys go with it. Awesome drive.
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Unread 17-01-2010, 21:49
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Re: pic: Ramp Video

Quote:
Originally Posted by GaryVoshol View Post
Joe, it seems to me that as the middle wheel goes up, the outer wheels go down. Wouldn't this cause the bumper height to change? Bumpers must remain in the BUMPER ZONE, 10-16" off a level surface.
<r07>The BUMPERS must be located entirely within the BUMPER ZONE when the ROBOT is standing normally on a flat floor,

The measurement is taken when the robot is on flat floor. We meet all requirements that we have found in the rules. The bumpers are between 10 an 16 inches above the floor when on flat ground.
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Unread 15-01-2010, 11:06
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Question Re: pic: Ramp Video

Looks like your center wheels are 2 individual omni wheels per side, each one slaved to either the fore or aft mecanum wheel. So basically the center wheels are commanded to have the same velocity profile as the front/back wheels. Is this accurate?
btw, awesome design and thanks for sharing your ideas. We're a second year team so still need lots of help!
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Unread 15-01-2010, 11:16
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Re: pic: Ramp Video

Quote:
Originally Posted by betsy888 View Post
Looks like your center wheels are 2 individual omni wheels per side, each one slaved to either the fore or aft mecanum wheel. So basically the center wheels are commanded to have the same velocity profile as the front/back wheels. Is this accurate?
There's a ball differential so if the front and back wheels are spinning in opposite directions, the omnis don't turn.
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Unread 15-01-2010, 16:46
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Re: pic: Ramp Video

This may sound a tad bit pompous but that seems like lawyering to me. The way we look at it is: What's the purpose of the rule? What is it trying to stop us from doing?

Last year, there was a robot that had fans on the bottom of it at the Portland regional. The idea was to suck it down to the floor in order to gain more traction. The judges didn't let it slide and the team ended up with a box on wheels. I'm not trying to be a rules Nazi, I just think the judges won't let it pass and you'll be in some serious trouble...
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Unread 15-01-2010, 16:53
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Re: pic: Ramp Video

Quote:
Originally Posted by FlyingHedgeHog View Post
This may sound a tad bit pompous but that seems like lawyering to me. The way we look at it is: What's the purpose of the rule? What is it trying to stop us from doing?

Last year, there was a robot that had fans on the bottom of it at the Portland regional. The idea was to suck it down to the floor in order to gain more traction. The judges didn't let it slide and the team ended up with a box on wheels. I'm not trying to be a rules Nazi, I just think the judges won't let it pass and you'll be in some serious trouble...
That specific robot design was ruled illegal by the GDC in the Q&A weeks before the competition.

The Q&A is the only way to figure out answers to designs like this.
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Unread 20-01-2010, 11:07
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Re: pic: Ramp Video

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Originally Posted by joeweber View Post
As you can see from the drawing the frame is stationary on level ground and does not articulate. When it goes over the ramp the drive system articulates but the frame remains solid. ( the frame is where the bumpers are attached).
Correct me if I'm wrong, but wouldn't the sections connecting the omnis to the mountings have to get longer/shorter as it tilted? Adding height to the slope gives a longer line.
Unless the mountings can tilt in and out?
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Unread 20-01-2010, 11:39
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Re: pic: Ramp Video

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Originally Posted by DynamiteHack View Post
Correct me if I'm wrong, but wouldn't the sections connecting the omnis to the mountings have to get longer/shorter as it tilted? Adding height to the slope gives a longer line.
Unless the mountings can tilt in and out?
The rear virtical strut will pivot at the frame.
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