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-   -   No Pneumatics? (http://www.chiefdelphi.com/forums/showthread.php?t=116001)

w1n5t0n 12-04-2013 16:10

No Pneumatics?
 
My Team (Haywire, 1569) generally refrains from using Pneumatics. This year wasn't any different and our robot is fantastic. I noticed this year that majority of teams used them. Anyone else not use them?

Walter Deitzler 12-04-2013 16:13

Re: No Pneumatics?
 
3397 has not used them since our rookie year, 2010. We have just not seen the need for them since then.

artdutra04 12-04-2013 16:25

Re: No Pneumatics?
 
Adding a pneumatic system to a robot now is no longer the weight penalty it once was, especially since the VIAIR compressor and plastic air tanks are a fraction of the weight of their predecessors.

They have some other nice aspects like having the ability to be stalled forever and to allow "after the buzzer" operation, both of which aided a lot of teams this year for their 10pt hanging mechanisms.

mman1506 12-04-2013 17:36

Re: No Pneumatics?
 
Pneumatics also puts out the most power (speed/torque) for there weight

Tow 12-04-2013 18:00

Re: No Pneumatics?
 
Actually our team has never used pbeumatics since it's rookie team, but is mayoritarily because we actually don't know how to use them well

pmangels17 12-04-2013 18:01

Re: No Pneumatics?
 
For us, our transmissions use 3 different air cylinders. One for PTO (power take off), on for Hi-Lo Shifting, and one for our Pneumatic Brake. Some teams use servos to shift, but they are fidgetey. We are going to try a servo powered brake, results to come eventually. Many teams have had success with window motors for shifting multiple gearboxes at onc, but we prefer pneumatics, and with the size constraint it makes life easier. Pistons are also more accurate on many two-position mechanisms, whereas the same mechanism with a motor would require a gearbox and limit switches/potentiometers/encoders.

Pneumatics are pretty simple, as long as you don't try to put a 1/4" hose into a 6mm fitting :P

cjl2625 12-04-2013 21:27

Re: No Pneumatics?
 
We've had problems with pneumatics in the past, so now we pretty much just stay away from it altogether.

CENTURION 12-04-2013 21:41

Re: No Pneumatics?
 
Quote:

Originally Posted by cjl2625 (Post 1261158)
We've had problems with pneumatics in the past, so now we pretty much just stay away from it altogether.

I've heard sayings to this effect before in my own team. We had a pneumatic system in our 2010 robot that had leaks and other sorts of issues, and that lead many students to swear to never use pneumatics again. One even said that we should make it an official team rule: No Pneumatics.

But those students graduated, and the newer students this year threw a pneumatic system in the robot. And it works just fine ;)

I guess what I'm saying (And I really do mean it in the nicest way possible) is;

It's probably not the pneumatic's fault.

mman1506 12-04-2013 21:43

Re: No Pneumatics?
 
The only pneumatics part we really have had a problem with is the old festo KOP solenoids. The SMC ones work great.

Jacob.B 12-04-2013 22:04

Re: No Pneumatics?
 
The HOT team doesn't use pnuematics and haven't for a while. This year they have Vex Ball shifters that they can't shift, YET! :D

Andrew Schreiber 12-04-2013 22:04

Re: No Pneumatics?
 
Wait... you can build a rowboat without pneumatics? Ooops.

Andrew Lawrence 12-04-2013 22:39

Re: No Pneumatics?
 
We didn't use pneumatics last year or this year. No major situations where we said "darn, we wish we had pneumatics for this". That being said, we may use them in our robot redesign for some Ultimate Ascent offseasons for shifting, feeding, and climbing.

Billfred 12-04-2013 23:10

Re: No Pneumatics?
 
2815 has used pneumatics two years out of five, 2010 (shifting) and 2013 (shifting and frisbee firing).

2815 has missed Championship two years out of five, 2010 and 2013.

Correlation vs. causation aside, it is something that gives me a little pause before immediately jumping to them.

Ernst 12-04-2013 23:30

Re: No Pneumatics?
 
1732 has been using pneumatics for at least the past 4 seasons. We found out this season that a lot of our leaks were coming from off-square cuts on the ends of tubes. This caused them, when plugged into a fitting, to not form a perfect seal. We solved that problem this year with a pneumatic tubing cutter that makes it difficult to make a bad cut.

CENTURION 12-04-2013 23:55

Re: No Pneumatics?
 
Quote:

Originally Posted by ZehP (Post 1261209)
1732 has been using pneumatics for at least the past 4 seasons. We found out this season that a lot of our leaks were coming from off-square cuts on the ends of tubes. This caused them, when plugged into a fitting, to not form a perfect seal. We solved that problem this year with a pneumatic tubing cutter that makes it difficult to make a bad cut.

YES!

These are an absolute necessity. Perfect cuts every time!


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