Team 842 Testing Shots
 

Here are some different shots we were testing today:
http://www.youtube.com/watch?v=ldO02ByEn5o

How are you guys varying the pressure the cylinders launch at?

Re: Team 842 Testing Shots
 

I'd guess they have multi-stage pneumatic cylinders.

Re: Team 842 Testing Shots
 

The pressure is held constant for all of these shots - 60 psi. There are some tricks you can do in software to adjust the trajectory.

Re: Team 842 Testing Shots
 

I believe what they do is vary the air pulse timing in code- I remember hearing them talk about this in one of their videos.

Re: Team 842 Testing Shots
 

This is brilliant...

::rtm::

Re: Team 842 Testing Shots
 

Its a lot of fun!

Re: Team 842 Testing Shots
 

Yeah, and I think you have already scared a 1165er!

Re: Team 842 Testing Shots
 

This is awesome! You guys are hitting all of the shots we hope to, but without all the crazy mechanical stored energy.

Question, in your testing, how many tanks are you running with, and how many shots do you get before needing recharge? Is the compressor able to "keep up" with how fast you're taking shots? It looks like in a short time you are making some shots quickly, just curious as to how much air this shooting method requires.

Very cool, will no doubt be highly effective, and very simple!

Can always count on 842 to come up with some innovative solutions, and then share them in order to inspire the rest of us! Thanks!

-Mike

Re: Team 842 Testing Shots
 

Love this setup. That last shot, should be pretty much impossible to stop and completely repeatable. That has been on our list of shots we need to have.

Re: Team 842 Testing Shots
 

What are the bore sizes on those cylinders? Can't tell if it's 1.5 diameter or 1 1/16. Looks identical to what we have gotten so far. Good job guys! Looks awesome!

Re: Team 842 Testing Shots
 

We can shoot about 2-3 high goal shots from the middle of the field before the compressor needs to turn back on.

They are 1.5 in diameter.

Re: Team 842 Testing Shots
 

What kind (make/model #) of solenoid are you using?

I'm assuming it's a double acting. What is the center position of the solenoid? A and B both closed? Both to Exhaust? No center position?

How are you precisely varying the timing of the pulse to the solenoid? Are you just counting cycles in the teleop periodic loop? Does that limit you to about 20ms increments? Do you need anything more precise than that?

So many questions...

This is very cool stuff.

Re: Team 842 Testing Shots
 

Nope. :)

Here's a part number for you though (see mcmaster): 6124K511

I'll let Sergio get back to you on the pulse control... I'm not sure how fast his program loop cycles.

Re: Team 842 Testing Shots
 

Hey there, nice job you did there! Looks amazing, and very powerful :)
We wanted to ask a few questions:
1. What is the length of your chasis?
2. What is the length of your pistons?
3. Is there any specific reason why you put your pistons in such starting angle? Did you find that angle more effective than others?

Good Luck, and see you at the competitions! ;)