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 Something has gone awry this year in FIRST. I think more teams are concerned with winning and their robot that they don't even stop to think about the kids on their team, or the learning experiences of others. - Amanda Morrison [more] |
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By: evanperryg
New: 05-07-2014 16:21
Updated: 23-07-2014 14:28
Views: 1709 times
This is a pretty complete drivetrain using the 2-speed gearboxes I posted recently. Total weight is 21.7lbs, excluding motors, lexan plates, and battery box. Outside dimensions are 28" wide, 32" long. The corners are 5" long, so the frame perimeter is exactly 112". Center 4 wheels have a 3/16" drop.
The corner gussets aren't completely necessary, but my team has found that gussets like this help prevent broken welds late in the season. We have used 3D printed chain tensioners similar to the ones shown. These would be produced with 90%+ fill, or would be made out of ABS. The wheels in the picture are custom 4" wheels.
Discussion
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05-07-2014 21:08
evanperryg
Re: pic: 8-Wheel Chassis
Starting the discussion thread for suggestions. Here's the STEP file: https://drive.google.com/file/d/0B4P...it?usp=sharing
05-07-2014 21:38
Tyler2517
Re: pic: 8-Wheel Chassis
I am exstreamly interested in the octagon frame, and what design decisions did you use to come up with it what advantages do you think it will give you?
Why the 8 sides with such steep corners?
05-07-2014 21:43
magnets
Re: pic: 8-Wheel Chassis
Looks good!
I would not set up the wheel axle bearings the way you have them now. I would definitely use some type of bearing block so that the bearing is well supported. Right now, all the load on the shaft is concentrated on only .125" of the bearing.
05-07-2014 21:56
evanperryg
Re: pic: 8-Wheel Chassis
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Originally Posted by Tyler2517
I am exstreamly interested in the octagon frame, and what design decisions did you use to come up with it what advantages do you think it will give you?
Why the 8 sides with such steep corners? |
). Octagon frames have a few advantages:-It allows you to have more inside surface area while staying inside a 112" perimeter.
-Defensive robots can't hit your corners. This doesn't sound like much, but any robot with omnis as outside wheels can easily be bumped out of position by a corner push.
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Originally Posted by magnets
I would not set up the wheel axle bearings the way you have them now. I would definitely use some type of bearing block so that the bearing is well supported. Right now, all the load on the shaft is concentrated on only .125" of the bearing.
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06-07-2014 01:16
BBray_T1296
Re: pic: 8-Wheel Chassis
Hey I just noticed something
The dimensions are 28"x32", which makes a 120" perimeter. If the rules remain as the last two seasons, you can only have 112" if this were for competition
06-07-2014 01:23
Tyler2517
Re: pic: 8-Wheel Chassis
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Originally Posted by BBray_T1296
Hey I just noticed something
The dimensions are 28"x32", which makes a 120" perimeter. If the rules remain as the last two seasons, you can only have 112" if this were for competition |
06-07-2014 01:24
Gregor
Re: pic: 8-Wheel Chassis
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Originally Posted by BBray_T1296
Hey I just noticed something
The dimensions are 28"x32", which makes a 120" perimeter. If the rules remain as the last two seasons, you can only have 112" if this were for competition |
1310 did the same thing in 2013.
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