pic: Team 675 2011 Robot CAD

[artdutra04]

Originally Posted by Hellfeier675

The frame perimeter is when you wrap a string around the robot and whatever the string touches is now defined as area for needed bumper coverage. Thus if we have a gap that is not touched by the string, we don't need to cover that area with bumpers. Thus, looking at all rules from 2008-2009, the bumper definitions are exactly the same, we would argue that having this open area in the bumpers is in fact legal. In previous year's robot we have indeed had these gaps in the frame and it was legal to not cover that area with bumpers. 2010 was the same way, except the bumper zone was higher than most people's kickers, thus most teams had bumpers around their whole robot, however there were a few that did not and it was still legal.

You better bring more plywood, pool noodles, and fabric to your first regional, because you're going to need to make a new front bumper.

Originally Posted by The Game Manual, Rule R07A

A. BUMPERS must provide complete protection of the entire FRAME PERIMETER of the
ROBOT (i.e. BUMPERS must wrap entirely around the ROBOT). As part of the 100%
coverage, BUMPERS must protect all exterior corners of the FRAME PERIMETER. For
adequate protection, a full segment of BUMPER must be placed on each side of the corner
(see Figure 3-2)

The key part there is the 100% coverage part.

The whole "wrap a string around the robot" thing is IMHO a poorly worded way of FIRST trying to communicate that the frame perimeter that the bumpers mount to must be a convex polygon.

[thefro526]

Originally Posted by Hellfeier675

2010 was the same way, except the bumper zone was higher than most people's kickers, thus most teams had bumpers around their whole robot, however there were a few that did not and it was still legal.

Can you show me a picture of a team that did not have full bumper coverage? At every event I went to, and every match video I watched, I did not see a single legal robot without full bumper coverage.

For the record, The last year where full bumper coverage was not required was 2009.

Originally Posted by artdutra04

You better bring more plywood, pool noodles, and fabric to your first regional, because you're going to need to make a new front bumper.

That arm looks like it might need to be rebuilt or at least tweaked to be able to function with a front bumper in place. You (OP) might want to pack some parts for that too.

[Hellfeier675]

We've built it in mind with having to place bumpers on the front of the robot, we were just curios as if we needed to or not. The arm does work with the bumpers there, but thanks for the heads up!

[Taylor]

If the C-Channel is attached to the bumpers, it would not count as support, backing, or coverage. There has to be actual robot frame to connect to on the front of your robot.

[Hellfeier675]

We're aware, but a removable bracket bolted to the robot frame that the bumpers pin to does not count as part of the bumpers, thus it will count.

[=Martin=Taylor=]

This design looks familiar

Fixing your bumper problem should be simple if the claw will still work with the bumper there.

Just bolt another tube across the front to provide "frame backing" and you'll be good.

What is the claw made out of? We made ours out of plywood, fiberglass, and chopped carbon fiber in '07; it was somewhat of a tour de force for our team at the time...

GL in Sactown!

[KevinGoneNuts]

[quote==Martin=Taylor=;1037177]
This design looks familiar
[quote]

I don't know what you're talking about

[KevinGoneNuts]

Originally Posted by =Martin=Taylor=

This design looks familiar

I don't know what you're talking about

Originally Posted by =Martin=Taylor=

What is the claw made out of? We made ours out of plywood, fiberglass, and chopped carbon fiber in '07; it was somewhat of a tour de force for our team at the time...

We made it by epoxying two pieces of hexel together. It's quite light!

[Hellfeier675]

Originally Posted by =Martin=Taylor=

This design looks familiar

Fixing your bumper problem should be simple if the claw will still work with the bumper there.

Just bolt another tube across the front to provide "frame backing" and you'll be good.

What is the claw made out of? We made ours out of plywood, fiberglass, and chopped carbon fiber in '07; it was somewhat of a tour de force for our team at the time...

GL in Sactown!

That's where we got some of our inspiration from

Like Kevin said, we epoxied two pieces of 1/4" plywood together and epoxied the outer rim to stabilize it. There are parts where we glued c-channel to the outside to prevent damage, but overall we expect it to be strong enough
We had a second damaged one without the siding or extra epoxying and one of the claw "jaws" held 50 lbs of downward force by itself before it gave way

In reply to your bumper fix, I guess great minds think alike That's what we did today once we realized that we had skipped over a crucial rule, seems to have worked well enough on our practice robot!


See you at Sac!!!

[Hellfeier675]

Originally Posted by Hellfeier675

That's where we got some of our inspiration from

Like Kevin said, we epoxied two pieces of 1/4" plywood together and epoxied the outer rim to stabilize it. There are parts where we glued c-channel to the outside to prevent damage, but overall we expect it to be strong enough
We had a second damaged one without the siding or extra epoxying and one of the claw "jaws" held 50 lbs of downward force by itself before it gave way

In reply to your bumper fix, I guess great minds think alike That's what we did today once we realized that we had skipped over a crucial rule, seems to have worked well enough on our practice robot!


See you at Sac!!!

Hexcell***

Not plywood sorry!! xD


I'm curious for your claw this year, we saw the CAD but are still baffled

What kind of wheels are those? I know you've used mecanums in the past, but the render makes it hard to tell.

Also, anyone know how much it weighed? Looks light.