pic: Team 935's Chassis

[railerobotics]

loading photo ...

[Steven Sigley]

It's not gonna crumple if a robot falls on it right? Plus why the 80-20?

I do like the triangular and circular cutouts but it seems like too much was taken out.

Is there an arm?

How much does it weigh?

Very interesting.

[FlyingHedgeHog]

... How many CIMS is that? I think it might be over 5, and you're only allowed 5...

[EricH]

I only see 4 CIMs, all on the drivebase. I also see a window motor in the far back corner.

[FlyingHedgeHog]

Oh, I see. Sorry, these hours must really be getting to me.

[Hawiian Cadder]

nice, a low mecanum robot that climbs, i wanted to do something like that but with non driven omni wheels, hope to see you compete

[p8blr]

Originally Posted by Steven Sigley

It's not gonna crumple if a robot falls on it right?

I wouldn't worry about that too much, it's been a robust concept since 2006.

http://team935.com/media.php?photos

[Andrew Bates]

Why did you CNC so much? I only ask because to me it would make more sense to build a separate upper frame instead of extending the CNC so high up.

[Akash Rastogi]

Originally Posted by corpralchee

Why did you CNC so much? I only ask because to me it would make more sense to build a separate upper frame instead of extending the CNC so high up.

The last three posts of this thread pose similar questions and comments. Left unanswered to curious minds.

http://www.chiefdelphi.com/media/photos/34715

Originally Posted by Steven Sigley

It's not gonna crumple if a robot falls on it right? Plus why the 80-20?

I do like the triangular and circular cutouts but it seems like too much was taken out.

Is there an arm?

How much does it weigh?

Very interesting.

Their triangular pattern is very strong. Even with pocketing, the pattern plus the fact that it is quarter-inch 6061 allows their frame to be very rigid and strong. It will not "crumple."

[mjazzka]

Hmm, VERY interesting. It appears to me that when your robot is flat on the ground (like it is now) the middle four, non-mecanum wheels, are off the ground? So that would mean that they are only for getting over the bump. At least, it LOOKS like the axis of the shafts are not the same (see below).

http://s950.photobucket.com/albums/a...a.jpg&newest=1

Other than that, I am curious to see how ya'll elevate/score, I can't tell from the photo...

Good luck this year!


-624

[Brandon Holley]

To go along with some of the other comments here...

Where the bumper zone is on your robot appears to be the weakest area in terms of structure, at least from what I can tell from these pictures. We build our drivetrains (among other things) in a very similar manner as you guys. We use 1/4" aluminum plates, and use round standoffs to hold them together. This is what you have done in your drive system, but above the drive system there does not appear to be any standoffs. Seeing as this is where the bumpers will be, and thus most of your interaction with other robots will be, are you concerned about bending in that area?

Also, was that milled or waterjetted? If it was milled, I'd love to see some pictures of it in process if you have any.

-Brando

[IndySam]

I think that is a work of art.

Are you planning on using shims for attaching bumper? Your gonna have to do something to make those wheel bearings and screws legal.

[J_Beth]

Originally Posted by corpralchee

Why did you CNC so much? I only ask because to me it would make more sense to build a separate upper frame instead of extending the CNC so high up.

well, wouldn't it make more sense to make it out of one part instead of having multiple parts that could break, and have to be made with close enough tolerances to fit together.

[p8blr]

Originally Posted by Steven Sigley

It's not gonna crumple if a robot falls on it right?.

I wouldn't worry about that too much, it has proven to be a light, yet robust way of creating a custom chassis to the parts our bots require. Four years running with this design, and no structural failures yet.

http://team935.com/media.php?photos

[mjazzka]

Originally Posted by J_Beth

well, wouldn't it make more sense to make it out of one part instead of having multiple parts that could break, and have to be made with close enough tolerances to fit together.

In SOME things that is true, but a whole robot? If this frame got hit hard (which it will), there is a good chance that it would bend. You cant replace a bent part of a robot that is one giant piece. Unless you have infinite quantities of those plates! And besides, building the robot with good ol' nuts and bolts is fun!