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#16
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Re: pic: hmmm.
Haha, some nice replies here.
It's not that large or heavy, just a quick build from off the shelf materials. There is a reason for the amount of standoffs... |
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#17
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Re: pic: hmmm.
Now that we are done competing with it. I can go into a little bit more detail about it. The hook weighs around 1lb. Not bad for an entire arm assembly with a weight of 6lbs to get an easy 2 points.
Now, does it still look "over engineered"? We wrapped the winch cable in and out of all of the stand-offs, for one reason. Stability, I was scared that we would rip out a stand-off or the cable if we only put it around one of them. We never had a issues with it all and I was very happy. |
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#18
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Re: pic: hmmm.
Quote:
Do you see a cable attachment point? How about a mounting mechanism? All I can say is, without the rest of the lifting system, this is very questionable. Buuuuwaaaaahaha. OK, now that the second image is available, it answers my question. Ohhhh, I did it again! Last edited by billbo911 : 10-03-2010 at 17:55. |
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#19
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Re: pic: hmmm.
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Imitation is the sincerest of flattery... ...I stole the entire idea for 2849's hook once we ran out of weight for our pole climbing arm. You'll see something very like it in Baltimore over the next 3 days... Joe J. Last edited by Joe Johnson : 10-03-2010 at 17:58. |
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#20
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Re: pic: hmmm.
Quote:
Quote:
Last edited by Alex Cormier : 10-03-2010 at 18:05. |
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#21
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Re: pic: hmmm.
Quote:
I don't see buckling being a problem... ...plenty strong for me. Joe J. |
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#22
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Re: pic: hmmm.
Quote:
See my edit at the bottom of my post. |
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#23
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Re: pic: hmmm.
Quote:
We easily hang 150lbs off a similar hook (only with plastic spacers and the official screw of all right-thinking FIRSTers the 10-24). Our last one is the axle for a pulley with a loop of 1.9mm Spectra from Spearit.com all is well. The only "tricks" are just to be sure that the axle gets loaded in double shear not in bending because over an inch span the stress can get a bit higher than I'd like and make sure to guide the cable to the middle so that one side doesn't take all the load over the other. If those are the hardest issues I have to solve in FIRST, I'd be in good shape... Joe J. |
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#24
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Re: pic: hmmm.
My first post was a poor attempt at a bit of humor to go along with the early part of the thread. It came just prior to Alex posting the picture of the hook on the robot.
It was sort of a two part pun. Quote:
Now, after Alex posted the second picture, the design intent became much clearer. Thus my edit with an additional reference back to earlier posts. Quote:
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#25
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Re: pic: hmmm.
Our hook is a single piece of 3/4" aluminum, milled out in the shape of a hook. And you think *that* is overdesigned!
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