We were thinking about using a ball collection mechanism like the ones on robowranglers’s Vader (2014 aerial assist) as well as Spectrum’s robot from 2014.
We were also think about the Raptors’s mechanism from 2014 (the one with the timing belts).
We tried searching for CAD models but we couldn’t find any.
We would greatly appreciate any assistance in designing both mechanisms.
In addition, does anybody know how can we find some relavent resources / CADs?
To be honest, this style of mechanism is never going to be as effective as a traditional roller pickup. They’re also not particularly easy to build when compared to a simple through-the-frame roller intake (several of the Ri3D teams did these, reference their material for ideas).
I don’t want to sound overly negative, but I would strongly recommend against a pickup like this.
You are best to spend some time prototyping different mechanism to learn what the advantages and disadvantages of each of the general configurations. At that point, CAD can be used to work out the exact dimensions and to make drawings to communicate what you want built.
You may find some suggestions for critical dimensions by reading some of the threads on this forum. CAD, by itself, will not tell you what critical dimensions (such as ball compression) will be best for your application.
Check out the overall meta of the 2014 year, you will notice Ri3D pioneered a lot of different roller intakes and while you might not have the files available you should have more then enough to piece together a good intake.
I’m from the Raptors, and honestly, a piece of advice is that while belts are cool, we learned the hard way that you shouldn’t necessarily do them unless you’re ready for a lot of challenges that accompany them. Belts can be very tricky, and while they do look really cool, on our robot, they weren’t the most accurate.
Also, I’d recommend that if you do use them, put a backstop on one end!! This will help prevent the ball from coming out the other side unintended.
Belts can also be a huge power draw…so depending on how the rest of your robot is run/priority of scoring, that might be something to consider.
Best of luck in 2016!!!