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-   -   Safety inspection regarding open wheel shooters? (http://www.chiefdelphi.com/forums/showthread.php?t=114659)

nicholsjj 07-03-2013 01:45
Re: Safety inspection regarding open wheel shooters?
 
My only other issue with this is that uncovered wheels last year did not come under as much scrutiny as this year even though the same rule is in place. Also many freak accidents can occur at a regional and I would like to caution teams to focus on proper safety measures when they are testing their robots. Teams should make sure that they have total control of their robots when they are on the practice field whether the robot is shooting, using pneumatics, or climbing. I would like to add to this that the new 888's fans can draw blood quite easily. ::safety::

FrankJ 07-03-2013 08:36
Re: Safety inspection regarding open wheel shooters?
 
1 Attachment(s)
In light of the current discussion, we took off the wheel & are using our tee shirt cannon. Not sure what the rules say about sticking the barrel up the feeder.

FrankJ 07-03-2013 15:07
Re: Safety inspection regarding open wheel shooters?
 
Here is what Q&A has to say.

Quote:
Q. Would FIRST be willing to publish further guidance on the guard/protection requirements for open-wheeled shooters, in order to help teams operate safely and prepare for smooth and consistent inspection processes?
FRC1640 on 2013-03-05 | 4 Followers
A. Due to the large number of design parameters which affect the safety of a particular ROBOT MECHANISM it is not possible to provide absolute guidelines regarding compliance with [R08]. When considering MECHANISM safety, teams are advised to consider factors such as velocity, exposure, and material ratings. The Lead Robot Inspector at each event has final authority on any ROBOT'S compliance with [R08].

PhantomPhyxer 07-03-2013 17:42
Re: Safety inspection regarding open wheel shooters?
 
We just completed the Central Valley Regional in Medara, CA. Upon arrival there was a lot of concern from Inspection. But as we talked further, the biggest concern was regarding those Robots with riveted on threads that could have a rivet or rivets fail and fly off the Robot. They were also looking for Robots that had balanced their Shooter Wheels. This was a plus with Inspectors. We did balance our wheels. Our Team did not bring material to make a cover. So, we were at the mercy of Inspection. But after further review they passed our Robot. I suspect this issue is not dead and when we go to the Silicon Valley Regional, in San Jose, Ca we will "face the music" again. Our Shooter is a two Wheel Linear Shooter with two Pneumatic Wheels.

pfreivald 07-03-2013 17:47
Re: Safety inspection regarding open wheel shooters?
 
I'd be surprised if anyone questioned 1551's shooter wheels. We chose 6" x 2" solid rubber Colson wheels for two reasons, and one of them was that the chances of their causing harm to a person (who didn't try to, like, lick them at speed or something) was vanishingly small.

MrBasse 07-03-2013 18:49
Re: Safety inspection regarding open wheel shooters?
 
Quote:
Originally Posted by pfreivald (Post 1244957)
I'd be surprised if anyone questioned 1551's shooter wheels. We chose 6" x 2" solid rubber Colson wheels for two reasons, and one of them was that the chances of their causing harm to a person (who didn't try to, like, lick them at speed or something) was vanishingly small.
Do they have a recommended maximum RPM? When I looked at Colsons all I saw was generally cart or caster applications usually implying walking speeds. If I had no choice other than to be hit by a wheel coming apart, I would much prefer a hollow pneumatic wheel to a chunk off of a solid rubber wheel...

Gregor 07-03-2013 20:34
Re: Safety inspection regarding open wheel shooters?
 
GTR East is not requiring shooter covers.

pfreivald 08-03-2013 07:15
Re: Safety inspection regarding open wheel shooters?
 
Quote:
Originally Posted by MrBasse (Post 1244968)
Do they have a recommended maximum RPM? When I looked at Colsons all I saw was generally cart or caster applications usually implying walking speeds. If I had no choice other than to be hit by a wheel coming apart, I would much prefer a hollow pneumatic wheel to a chunk off of a solid rubber wheel...
Not that I could find. In-house testing shows basically zero deformation at shooter speeds, though.

45Auto 08-03-2013 07:49
Re: Safety inspection regarding open wheel shooters?
 
Quote:
In-house testing shows basically zero deformation at shooter speeds, though.
How are you measuring them while they're spinning at probably several thousand RPM?

FrankJ 08-03-2013 08:32
Re: Safety inspection regarding open wheel shooters?
 
Measuring the deformation at speed is relatively easy in qualitative terms. Place a fixed reference point close to the wheel, but where it will not touch when the wheel is at speed, an visually observe the deformation. Like truing a bicycle wheel. If the wheel always returns to the same size when stopped, you are in the elastic region of deformation. The pneumatic wheel's change of shape is not a good indicator of it being safer or less safe than other wheels. It is really just telling you it is not as stiff as other choices.

pfreivald 08-03-2013 08:34
Re: Safety inspection regarding open wheel shooters?
 
Quote:
Originally Posted by FrankJ (Post 1245133)
Measuring the deformation at speed is relatively easy in qualitative terms. Place a fixed reference point close to the wheel, but where it will not touch when the wheel is at speed, an visually observe the deformation. Like truing a bicycle wheel. If the wheel always returns to the same size when stopped, you are in the elastic region of deformation. The pneumatic wheel's change of shape is not a good indicator of it being safer or less safe than other wheels. It is really just telling you it is not as stiff as other choices.
Yup.


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