Re: Team 842 Testing Shots
 

With a motor, you use a gearbox to trade speed for torque.

With a pneu cylinder, you use leverage to trade force for speed.

Re: Team 842 Testing Shots
 

How are you guys loading the ball? Does the arm go down further?

Re: Team 842 Testing Shots
 

I basically use the Timer class. It does not seem to be having any issues with that.

Re: Team 842 Testing Shots
 

That pile of broken ceiling tile has nothing to do with the robot right?

Re: Team 842 Testing Shots
 

Robots*

Re: Team 842 Testing Shots
 

Could this be used to pass or catch?:confused:

Re: Team 842 Testing Shots
 

Could you please explain in greater detail how to implement this?

Re: Team 842 Testing Shots
 

Use the timer class to set the pistons to true for a certain amount of time then set them to false right after.

Re: Team 842 Testing Shots
 

The amount of inspiration this video has given me cannot be quantified.


What solenoid are you using? is there any special storage tank between the solenoid and the cylinder? Or is it just


Compressor ---> Pressure Sensor -----> Storage Air Tank ----> Regulator ----> Solinoid ----> Cylinder.

*Forgive me for my lack of pneumatic knowledge if that order is so wrong that I deserve to be flogged.

Re: Team 842 Testing Shots
 

Super cool!!! I look forward to seeing you at the AZ regional.

In the videos your team posted on Facebook you have another piston that goes up and down as you fire, what is the point in this and how does it work?

Re: Team 842 Testing Shots
 

Compressor, pressure sensor, primary storage tank, regulator, secondary storage tank, solenoid, cylinder

Re: Team 842 Testing Shots
 

That additional piston gives us the ability to adjust the trajectory further. Just by varying the pulse to the main catapult cylinders, we are able to make a relatively lofty truss shot and a pretty hard/flat high goal shot. The geometry of the arm for those shots doesn't work for the in-front-of-the-1pt-goal high goal shot, so we added another degree of actuation.

We did a few quick tests today that make a self caught shot over the truss look feasible using these additional pistons; it will be pretty neat if we can pull that off in a match!

Re: Team 842 Testing Shots
 

First let me say how impressive this design is. The flexibility is incredible! Can you please provide more details on how you implemented it including cylinder dimensions (bore & stroke), release, distance cylinders are attached from the pivot, pneumatic connections, are you using 2 tanks per cylinder? are you using separate solenoids for each cylinder? Our team tried to replicate your set up tonight and couldn't get anywhere close to the range you demonstrated.

Thanks...

Re: Team 842 Testing Shots
 

Our team used a different mechanical approach to varying our shots with the same shooter mechanism.
After seeing this thread early yesterday, we have already tried with great success the software pulsing of the solenoids instead.

Thanks for sharing.

Re: Team 842 Testing Shots
 

OK, we had similar size cylinders, similar sized catapult, and tanks directly connected to the cylinder ports (mechanical release - we didn't even get into large CV solenoid valves yet) and we could not make our shooter make long shots like yours. We clearly have some learning to do. I'm looking forward to seeing more of your system after build season!