Build Blitz Robot Reveal - Team JVN
 

After one of the most intense three days of their lives, Team JVN is proud to present their final creation. Features include:

• New 2014 Drive in a Day chassis that is now available to all teams, with four omni wheels and direct-mounted CIMs
• Launcher with 60 ft-lb of surgical tubing, pulled back by a custom cam actuated radial release mechanism (or "choo-choo")
• Optimized shot to score anywhere 7-18 ft from the goal using "Aren's Sweet Spot"
• Intake roller using 3.25" VersaWheels and passive side rollers, run by a Mini CIM motor mounted on a 9:1 VersaPlanetary

Check out the official reveal video here: http://www.youtube.com/watch?v=Gm96S8gdhR0

For more information on how this robot came to be, be sure to check out BuildBlitz.com, where you can find team bios and a full CAD assembly. The mission of Build Blitz is, and has always been, to educate teams on the process these designers went through when designing their robot. As such, check out the liveblogs on the homepage of BuildBlitz.com, and feel free to use this thread to discuss or ask questions about Team JVN's final product.

Re: Build Blitz Robot Reveal - Team JVN
 

You linked Copioli's video in the post instead of JVN's.

But otherwise, I LOVE team JVN's robot. It great, and fairly simple at the same time.

Re: Build Blitz Robot Reveal - Team JVN
 

You made it in right before I edited it. Should be fixed now!

Re: Build Blitz Robot Reveal - Team JVN
 

I have to say, I was rooting for Team Copioli from the beginning, but I really have to hand it to Team JVN. They pulled off an extremely effective robot, even for a six week timescale.

Re: Build Blitz Robot Reveal - Team JVN
 

Question. The choo-choo cam appears to be spinning at roughly 5 sec/rev = ~12 RPM. So the BAG motor would be spinning at roughly 5*100*84/18 = 5600 RPM, or 37% of free speed. Is full voltage being applied to the BAG motor?

Re: Build Blitz Robot Reveal - Team JVN
 

Ether,

That video clip is slowed down, in actuality it take about 2 seconds to reload.
We are giving the BAG full voltage.

Re: Build Blitz Robot Reveal - Team JVN
 

Love the four bar mechanism for getting the reload. Extremely ingenious!

One question though, why did you use omni wheels rather than Mecanum? Was it availability or was it programming (I think I remember you guys using a VEX system, not the C-Rio with Labview) or just easier to do it with Omniwheels?

Re: Build Blitz Robot Reveal - Team JVN
 

I thought that might be the answer. Your new numbers put the BAG in a happier place on the motor curve :-)

Re: Build Blitz Robot Reveal - Team JVN
 

Yeah, I'm looking forward to next year with the new PD board with current monitoring built in, we did test some with a clamp on ammeter and saw ~12amp peak draw for the windback.

Re: Build Blitz Robot Reveal - Team JVN
 

Thanks for that bit of data, Aren. Seems like the mini-CIM BAG is a bit oversized for this mechanism, electromagnetically speaking. I like that. :]

Re: Build Blitz Robot Reveal - Team JVN
 

How are you guys releasing the shooter? I have downloaded your Cad files looking for a way of releasing it from the gearbox or cho-cho? can you please explain.

Re: Build Blitz Robot Reveal - Team JVN
 

Such an elegant design, we'll def be prototyping our own version! Team 271 sends our thanks and can't wait to look at those CAD files :D

Re: Build Blitz Robot Reveal - Team JVN
 

http://www.chiefdelphi.com/forums/sh...68#post1326068

Re: Build Blitz Robot Reveal - Team JVN
 

We are currently looking at testing a choo-choo, and we are planning on using a 775, thru a 63:1 versaplanetary, then a similar 18:84 ratio. At 25 amps, it should spin at about 30 rpms, and pull about 350 lbs at a point 2 inches out from the rotation. Overkill a little, but more speed and power is always the answer.

Re: Build Blitz Robot Reveal - Team JVN
 

How did you calculate the 350 lbs number ?