Re: Robonauts CAD
 

Theoretically with the center 2 wheels larger than the outer sets and the CG of the robot is between the center axles they are the only set of wheels in contact with the ground; with the exception of directional changes and rapid acceleration changes where those outer set of wheels technically act as a powered wheelie bar.

Yes, there will be some pulling/dragging of wheels for brief moments due to difference in diameters. With this setup you should expect your center 2 wheels to wear faster than the outer set of wheels.

I cannot speak for the 118 specific wear issue though.

Re: Robonauts CAD
 

I'm having some issues seeing the file. After I download it, it won't open in AutoCAD...

Re: Robonauts CAD
 

Not sure if joke, but you'll need a 3D parametric CAD program such as SolidWorks, Inventor, or Creo, plus a lot of RAM (around 12 gigs at least for 2013 model).

Re: Robonauts CAD
 

I wish it was a joke. I'm completely new to the Autodesk world and was hoping that by looking at some quality work I might be able to learn something.

Re: Robonauts CAD
 

I have a few questions:

How long did it take to make the autocad file?
How long did it take to cut out all the parts and powdercoat them?
How long did it take to assemble?
How long did it take to make the code?
Who worked on it? (NASA engineers, students, teachers)?

Re: Robonauts CAD
 

Very nice detailed model!

If you are a student, you can download Autodesk Inventor free from: http://www.autodesk.com/education/student-software.
You will need a good computer though. Any 3D CAD software needs a dedicated graphics card and lots of RAM. The 2013 Robonaught model took up 7GB when I opened it.

Re: Robonauts CAD
 

Thank you for the link! I already have AutoCAD but I couldn't find Inventor on their website.
I also recently bought a wonderful HP built specifically for CAD and my programming needs so I think I'll be okay:)

Re: Robonauts CAD
 

If you following Chris's (luckof13) link, click on free software on the left-hand side then scroll down to "Inventor Professional" and select the one you want.

Let us know if that doesn't work! :)

Re: Robonauts CAD
 

Excerpt from FRC Designs: http://frcdesigns.com/2013/12/17/rob...n-frc-designs/

Re: Robonauts CAD
 

FYI...

We've updated the CAD files available on our website.

Our robot changed quite a bit during the season, so we uploaded a file of the robot at the 6 week ship date and one from Championships.

Re: Robonauts CAD
 

Thanks!

Just a quick question, what was the "double hang" assembly? Was it ever used?

Re: Robonauts CAD
 

I've always been curious about how this affects pushing matches. In a pushing match there will be a much larger force on these wheel and it's crucial that they keep traction. Wouldn't it be impossible to maintain static friction on both of these wheels in this instance?

Re: Robonauts CAD
 

Just wanted to express my gratitude to 118 for releasing these models. They really are the sort of thing one can get lost exploring. The depth is just amazing.

Re: Robonauts CAD
 

That was a device to achieve a second rung hand using only stored energy.

The device was built and tested on a practice robot but never made the field.

Re: Robonauts CAD
 

That sounds really cool. As I recall the only other team that attempted a stored energy climber past the first rung this year was 1323. Anything you can tell us about the design of the mechanism or why it wasn't implemented?