I’ve just found this out, and I thought I’d post it here because it was really useful for me.
The robonauts have put up CAD models of their 2007, 2009, 2011, and 2012 robots, which are really neat, very detailed, and some of the best CAD work I’ve ever seen from an FRC team. I now know how their massive gearbox in 2007 works!
there goes the rest of my day. Seriously love how amazing 118’s bots are. I hope 118 post the CAD of the side bridge mechanism from 2012, that thing was really cool even though it got the ruled as illegal. Probably the most inspirational FIRST robot mechanism to only to be used in a practice match.
I wouldn’t say totally unfair. The game manual did say no “grappling” on the bridges. Different people had different interpretations of what constituted grappling, and so by making the mechanism 118 took a risk.
This is incredible. I don’t think a single robot has had a bigger impact on my team than Robonaut 2012, and now we can check out the CAD! Thanks so much to an incredible team for posting these models.
The unfair part is when multiple teams repeatedly asked FIRST for a definition of “grapple” and FIRST wouldn’t provide it. The ruling on “grapple” in 2012 also relied on a different definition than 2011.
Wow. The 2013 CAD is really impressive. I can’t say that I’ve ever seen a cooler and more detailed CAD of any robot. Literally every thing on the robot is in the model.
I’m a huge fan of your gearbox. I don’t think I’ve ever seen another team use a dog shifter between a gear and a sprocket.
Just out of curiosity, how do you guys work with these massive files? It took me a good 10 minutes just to open it, and I have to look at individual assemblies or it is too slow. Does solidworks do a better job than inventor with big assemblies? For me, inventor uses 5 gb of RAM just to have the file open.
Ditto, I’m having fun just exploring the model. SO many impressive details.
Question, I’m looking at the “Magic Maker”, shooter angle flap. Why both the string and 10 turn pot? Redundancy? Flexibility to choose one or the other on the final product? Something I’m totally missing?
Another question, was Apex single speed? From what I can tell, the dog shifts between DT and Climb Wheel.
Thanks so much for posting these models! Can’t wait to show my kids on Wednesday. This is inspiring stuff.
We use Pro-E. The models get sluggish but people rarely work inside the complete model.
We divide the design and modeling tasks amongst the individual mentor leads. They’re responsible for their sub-team’s assemblies. We define a coordinate system for the robot…you essentially build your parts at your default location. When you bring each sub-assembly into the master you can drop it at “default” and it goes where it belongs.
Not everyone is a professional designer though, so we have one group that manages the master model and integrates to make sure we have no interference issues.
The “macker” or deflector used a pot for positioning. The string pot in the model is from an early design. Conceptual features aren’t always removed from the model.
Maybe I’m missing something, but how did you get your chain in there?
You drop the chain and sprockets straight into the tube from one end. Then, while the sprockets are approximately in position, you slip your shaft into place and put the backside bearing in.
We ran this setup all year without maintenance.
221 Robotic Systems is launching a production version based on this design for 2014. Personally I loved the space we gained back by moving the chains inside and the weight saved by removing the tensioning device.
Wow, I did not think internal chain like that without tensioner a was even possible. I can’t believe the chain never stretched or loosened. The space savings over internal timing belt (not to mention cost) means my team will have to seriously consider this as an option for 2014.