Re: New robot rules at Peachtree
 

I don't understand how this is worse than last year?

At Hub City, we competed just fine with the robot straight out of the bag

At Dallas, we were required to add a "sneeze guard" around our shooter wheel to contain a rapid unplanned disassembly.

Said guard was to be part of the robot and therefore was included in the 120lb robot weight.

A safety interlock is just about the same exact thing, considering, but it counts towards no weight.

Re: New robot rules at Peachtree
 

I don't thin Peachtree is adding a requirement. To me it seems that the LRI is going out of his way to disclose to all teams how he plans on enforcing R8 at his event. He is giving all teams a heads up days in advance of what you should have in order to pass his interpretation of R8.

Personally I wish more LRI did this, if they publicized how they would be enforcing some of the grey areas in the rules it would prevent teams from getting caught last minute at the event where there is nothing reasonable they can do to fix it.

Re: New robot rules at Peachtree
 

Which why if a list of possible R8 issues was to be published it would have to been non exclusive since other issues will come up during the season. And this is exactly why R8 exists in such vagueness.

In answer to another post. Safety starts at the top by First, works its way down through the events, and ultimately gets to the robots in part by the inspection process.

Re: New robot rules at Peachtree
 

Our shooter is a Barrett cross bow. When pulled back 10 inches it's quite taught, and although there's a pneumatic break pin holding it back, we still made a pin as a failsafe.

I believe rules like this can be enforced under the "Safe" clause of the inspection. If your robot doesn't have a particular safety device an inspector could rule it "unsafe".

It falls under the same category as "dry fire" - while not explicitly stated your inspector may not pass you until you do. (Even though in our case dry firing is more dangerous than not...)

Re: New robot rules at Peachtree
 

Certainly I do recall making similar decisions, and I recall the statement in 5.5 that "[e]vent staff have the final decision authority for all safety-related issues within the venue", but I think the issue of delegation is more nuanced than you suggest. First and foremost, such delegation is not licence to use the robot rules in a situation for which they were not designed, but rather to promote safety within the decision-making framework established for event operations issues.

If I'd been challenged on a matter of general event safety, once the immediate hazard was defused, I would not have invoked the LRI's final authority over robot rules, and instead would have allowed the possibility of an appeal to the regional/event director. As an LRI, I was never given the instruction that the regional/event director had delegated all decision-making authority over pit and queue safety to me, and thus left open the possibility that other staff (pit administration, lead queuer, FTA, lead safety advisor, etc.) might have differing opinions that might have to be reconciled by the regional/event director.

As a practical matter, I've been challenged on robot rules issues many times, and rejected such challenges on the basis of the LRI's final authority, but I don't think I've ever been challenged on an event safety question not specifically enumerated in the administrative manual, and therefore never had occasion to refer it to the RD/ED.


This may be something of a fine distinction, but it's important that teams understand that the scope and content of the game manual is constant. If an event wants to be more strict about matters of general safety, it has that right, but it should strenuously avoid implying that the authority to do so at all times comes from the robot rules. (That's the core issue I wanted clarified.)

You might even say that making that distinction makes decision-making easier. Since inter-event consistency is a crucial characteristic of robot rules, but merely convenient in the case of event safety policies, there's less need to worry about whether teams were treated differently at other events. Seen in that framework, it gives events more flexibility to be as safe as they desire, not less. (However, as Karthik notes, it would be even better if event safety were also handled consistently.)

Re: New robot rules at Peachtree
 

This is not an "event safety" issue - it's a robot safety issue. If a robot creates an unsafe condition at any point, it's covered by R08. This doesn't stop at the borders of the field, or when the power switch is thrown. It's all the time. If a robot creates an unsafe condition by not being able to release all stored energy during transport and handling, that's an unsafe condition created by the robot. Stop trying to lawyer-esk this into something its not, Tristan.

Re: New robot rules at Peachtree
 

Exactly what I thought of Steven for ours when I read the OP thread.....Have you actually dry fired that though w/ that interlock in place? Seems to me mechanically speaking....While much less force will of course be applied by the pressure system during any possible (fully extended catapult), accidental firing, since it has to fill those full open cylinders below the plunger (there is still air volume already in those 2 cylinders at atmospheric pressure)... and our catapult has 3, but is very much like yours, though not compressed to 50-60 PSI of course....It won't be fully possible to just vent out to atmosphere will it? Of course, it also won't be able to extend beyond the cylinder max. rod length either, and will apply a whole lot less force to the mechanism I'm sure. (How much force is my question?)

I just personally (nor would I want anyone else to be), wouldn't want to be anywhere around it during the very first dry fire excercise. We have dry fired our mechanism many times (from rested stroke bottom), just to make sure we could safely do so without damage to the bot or anyone, if asked to during inspection, and it is quite violent to say the very least, without the load of a ball in there. (It hops almost exactly like your "bunny bot" does!)

And (admittedly), we had to beef up to thicker material on the vertical support during or shall I say, after the first few (20-25 or so), loaded & dry fire shots/tests, due to slight upright support tube bending below the pivot point (our tube material was just too thin walled and bent slightly in the middle of the rise, but we found that out early on, and went much thicker walled w/ the final product. (changed the upright on both bots).
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If you have actually dry fired w/ that safety device in place at full extension...Does it just reasonably thud and then vent to atmosphere? Or, does it forcefully still bang when the compressed air hits those plungers inside the cylinders that are already extende and at the top of the stroke?
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Just trying to learn from you first....Then I'll suggest 1-3 of them to the team as we already have a couple of sticks of 1/2" ID poly line here, I bought for another purpose and we never used, that they could easy cut there in Chandler in minutes tomorrow (or even here before leaving tonight since milling the slot would be easier on a mill), then paint red, add the remove before flight ribbons. (Not an engineer here, just a foolish mechanic).

The act of carrying at energy state onto the field always bothers me dearly, for them. (Especially this year, though the know how to safely carry it). After disable or the matches, release is always perfomed first as a ritual.

Re: New robot rules at Peachtree
 

Of course, removing that particular type lockout (and I think it is a fine example of a number of solutions possible), will still create a few seconds of dangerous time each match for "the remover," once that bot is placed on the field fully charged. Something they are not used to from practice (our catapult is powder coated completely BRIGHT RED, and is also marked in big red letters "DO NOT TOUCH!" down both sides on the top side). They would have to now (touch that mechanism while system is charged w/ energy), hold it up for a second w/ a pc of like pvc pipe, I'd sure suggest, and then remove the lockout and release it, once before each match, and also carry it a little differently (due to a center of gravity difference), from the queing or pre-charging point, onto the field fully extended (makes that small compact bot package a bit taller is all).

We mitigated the safety issue by teaching proper handling (side carry only, never, ever, lean over that bot unless that dump valve is open, and the Master breaker is absolutely off)....They might just be required to change that is all.
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Surely, we cannot ever think of adding a reasonable enabled precharging period of time onfield (say 2-3 minutes or so, to those choosing to use pneumatics in their designs), to each match, once those bots are on the field and all players are safely off....We have a schedule to keep, you know..."The show must go on!" (SRY, I'm just a sourpuss here this morning).

Good Luck to all the Teams competing this week and every week...Go Team 60! (And everyone, please try to be extremely safe in all your actions!)
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As an aside (speaking of safety here), I watched that Team 92 video of the white plastic tank testing (pellet gun damage to a 120 PSI charged tank(s) for fracture damage mitigation purposes), last night, and if you have not watched it yet, and you use those white 2013 Clippard Tanks,...Then, I suggest you need to watch it, ASAP. Great Job there Team 92!)...That is my specific worry for all in attendance everywhere. The shrapnel radius and force is downright scary based on their simple testing.

Just installing the 2014 (KOP) black tanks into a brand new tight fitting set of mounting clips made me just cringe doing the act when they were brand new & empty. And those clips are designed for those specific tanks. Polypropolene may be much better than PVC or other types of plastics though on that particular issue of fracture and possible shrapnel (it has not been tested yet that I have seen, though 92 said they would conduct same testing if some were donated), and the built-in push connectors on both ends are certainly much better I think than added brass fittings and the required tightening sequence done by students.

You can slide em in, or snap them into the clips...But, either way it made me think about all the possibilities later during this game and others. The mounting clips do secure the tanks very well though...Have to give them that.

Re: New robot rules at Peachtree
 

We have dry fired with that interlock installed - the result is a reasonable thud as the pistons become rigid, but nothing alarming, and nothing I would see as dangerous. We've actually used the interlock to test the firing code with no ball, and it works quite well. There's no way for the arm to build up kinetic energy when in this configuration.

As far as the exploding tanks go.... I hope we never see one! I will certainly be traversing the pits with more caution this year than last.

Re: New robot rules at Peachtree
 

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Thanks for that info Steven, glad to hear only the "reasonable Thud" part. They need to also do that same thing then I think. Ahh, and yes, it would work for the firing code test too, without creating the "wild energizer bunny effect" on the dry fire...Also very good to know. Much safer in certain areas than an actual dry or loaded fire, for all concerned.

Good luck this weekend to your team! And, I also hope none of us ever do hear that tank explosion sound either! Or feel it...ever.

Just thought I'd mention it after I saw the vid (and your white tanks, not that there is any proof that black ones or any other plastic tanks are any safer that I have seen yet)....Can't tell what type or Mfg. though those actually are from the pic, but they do have the brass fittings.

Re: New robot rules at Peachtree
 

Let me propose a thought experiment. There's a robot with a mechanism that includes a big metal spring. If that mechanism fails, the spring could be ejected unsafely. To mitigate this, the team has installed a guard that contains the spring in case of failure. This is consistent with the robot rules, including R8.

However, to troubleshoot an interference issue, the team needs to operate the mechanism without the guard, and intends to do so on the practice field. Recognizing the hazard this poses, they propose to place a large metal toolbox beside the mechanism as an effective substitute for the guard.

Obviously this toolbox, which is not a robot part, does not comply with R8 any more than a promise to park the robot up against the alliance station wall for the duration of a match. Would you rule the proposed test an R8 violation, and prohibit the team from conducting it?

Re: New robot rules at Peachtree
 

I fail to see what your "thought experiment" has to do with the LRI asking teams to specifically mitigate known safety risk concerns with their robot. Lets try to stay on topic.

Re: New robot rules at Peachtree
 

Jon this is not correct.

Without looking at a robot you cannot say there is a KNOWN safety risk.

In addition, R8 requires a shooter to be not unsafe. If a shooter at peachtree is "not unsafe" it will still require a interlock. This IS a rules change, so my question is still valid. How far can a regional go in changing rules (or interpreting them ... if you so wish to argue that point)?

At what point does it degrade the authority of the GDC?

Again, I wholeheartedly agree with the intent of the LRI and my team will comply with this very reasonable request, but I am concerned with the precedent it is setting.

Re: New robot rules at Peachtree
 

Is Peachtree saying that a robot with stored energy but without an interlock in place is unsafe? I believe that there's already a thread on "safety theater" that could be appropriate.

In that case, it would probably be wise to enforce something like G40 on the practice field and in the pits and prohibit students from being in the proximity of the unsafe robots.

My thoughts would be that a cluttered 10 x 10 pit, with a robot in the middle of it, and crowded students troubleshooting a damaged or non-operating shooting mechanism is about the most unsafe condition you can imagine.

If safety is really a concern then prohibit stored energy anywhere except after the start of the game on the actual playing field, where barriers and rules such as G40 are in place.

Re: New robot rules at Peachtree
 

You asserted that R8 enforcement was applicable everywhere, at all times. I provided an example where R8 enforcement would outlaw a safe and reasonable off-field procedure. My implication was that we can still have safety at the event without trying to adapt R8 to situations for which it is unsuited.

The LRI needs to insist upon safety in general, but not necessarily R8 in particular (except at inspection and on the field, where R8 compliance is certainly mandatory).