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Re: What's the best rope?
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Re: What's the best rope?
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please re-read your posts - who is being "That guy"? The one saying that he would check with an event official that has the power to make this ruling, or the one categorically stating someone else on the internet is wrong while having no official ruling to back it up? |
Re: What's the best rope?
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Re: What's the best rope?
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A fiber is really just a small piece of anything. see webster below. Definition of fiber 1 : a thread or a structure or object resembling a thread: as a (1) : a slender root (as of a grass) (2) : an elongated tapering thick-walled plant cell void at maturity that imparts elasticity, flexibility, and tensile strength b (1) : a strand of nerve tissue : axon, dendrite (2) : one of the filaments composing most of the intercellular matrix of connective tissue (3) : one of the elongated contractile cells of muscle tissue c : a slender and greatly elongated natural or synthetic filament (as of wool, cotton, asbestos, gold, glass, or rayon) typically capable of being spun into yarn d : mostly indigestible material in food that stimulates the intestine to peristalsis —called also bulk, roughage So what exactly is your reason for saying this isn't legal? |
Re: What's the best rope?
personally, I believe that if you want a rope off the shelf that is static, gripy, and strong, without any modification, then I would say you should get a natural fiber rope
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On a side note, glass is not a liquid. (Reference) Quote:
Lastly, at no point did I say definitively that it is illegal, only that I would question it as an inspector and get a second opinion from my boss at the event, who is the LRI. If the event LRI is unsure, he or she can take it up to the CRI, who is on call to all LRIs during an event, or to FRC HQ. that is the process. |
Re: What's the best rope?
I reckon we will have to agree to disagree.
The rule clearly intends the rope be flexible to less than 12 inches vertical from the point it is held. They will have to give exact tolerances for a fiber and it be measured with an optical/laser comparator to fit your definition. BTW where does it say the bead is round? |
Re: What's the best rope?
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Re: What's the best rope?
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I don't want to have a team go buy this rope (since talking about it, they have gone from 201 to 171 feet in stock, so i suspect three teams bought 10 feet each!), develop a system that relies on it, and then have it non-functional because of an inspection issue. All inspectors have the goal of making sure everyone gets on the field and is playing by the rules. Please let us know when Q&A answers your question about this material. That being said, and after typing up a long reply with my reasoning (small glass beads are not flexible filaments), I went and found the manufacturer's website for this product: http://shop.pmirope.com/12-5mm-retro...s-rr125yg030ev Reading that, they don't talk about glass beads at all. they talk about "Retro reflective filaments" which are not glass beads. as a result, I think this rope is probably legal now. Am I willing to admit that my answer changed because of new evidence? yes. Am I willing to admit I was wrong? Yes and no. Yes, because the final material looks fine, now that there is more information, but No because given the originally linked page as the only documentation of the material, I don't think the material met the letter of the rule. I suspect we still disagree as to why the material is legal, but i think we both now agree that it probably is. |
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Re: What's the best rope?
For tha sake of a smooth running event I really hope people just stick with the field rope.
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Re: What's the best rope?
Does I04 and figure 9-1 really depict that a strap is a rope. Seem to eliminate difficulty and challenge of climbing a round gym rope. I admit I need more time to read and read again. At first impression I suspected the rope rule was going to be to have rope as similar to the 3 strand twisted rope depicted in the release videos.
Interpretation would be a 1/4 rope would be ok or 1" strap. The challenge is to engage the line and then is simply becomes a cable winch. |
Re: What's the best rope?
yes, the manual shows a strap as a legal possible rope, and even shows examples of ropes with knots and loops.
I honestly think they suggested it to reduce the Q&A on the topic about whether ropes need to be round in cross section (they do not). grabbing and climbing any dangling flexible object seems tricky. I like the way they designed this. |
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Re: What's the best rope?
I like the idea of off-field rope removal, but i think you'll have a hard time getting the rope off the davit if the robot is actively against the touchpad and the section of rope between the robot and the davit is under tension.
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