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Dome S101 from 2001
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# ? Jan 19, 2013 18:19 |
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# ? May 30, 2024 13:11 |
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Are those dampers rotating on single-shear pivots?
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# ? Jan 19, 2013 18:40 |
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Collateral Damage posted:I scrolled past this a bit too quickly at first and didn't realize what it was. That is awesome. Where do I buy one? The only place I've ever seen them in the wild is Seattle, and they're not jacked up or modded at all. http://seattle.craigslist.org/see/cto/3511117094.html
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# ? Jan 19, 2013 18:45 |
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Palpatine MD posted:Don't be modest, there are also hints of incestuous liaisons with a Testarossa and an SLS. Let's not overcomplicate this, it's basically a baby RS200 with gullwing doors: huge And I'd buy like 10 of them if they were available in Europe
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# ? Jan 19, 2013 21:47 |
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Poing posted:Are those dampers rotating on single-shear pivots? Yes and it looks like it works just great so there's no need to obsess over it. Do you obsess over single sheer ever time you step outside and see a tree?
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# ? Jan 19, 2013 22:22 |
Giblet Plus! posted:Yes and it looks like it works just great so there's no need to obsess over it. Do you obsess over single sheer ever time you step outside and see a tree? I don't really understand what's going on here, can someone explain single shear anything to me?
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# ? Jan 19, 2013 22:24 |
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Slavvy posted:I don't really understand what's going on here, can someone explain single shear anything to me? 1 single bolt serving as a pivot point on the dampers. This results in lots of shear (lateral) force put on it a single possible failure point, rather than spreading the force out over several to reduce the opportunity for failure and lessen stress on the bolts.
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# ? Jan 19, 2013 22:30 |
How would you spread the force out to several bolts? Doesn't it ultimately have to pivot on some sort of shaft+bearing anyway? I don't see the big deal really, if you just make the bolt/shaft/whatever thick enough it'd work fine wouldn't it?
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# ? Jan 20, 2013 00:09 |
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http://upload.wikimedia.org/wikipedia/commons/b/b7/Bolt-in-shear.PNG Click that.
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# ? Jan 20, 2013 00:24 |
So you would have some sort of plate that the top of the bolt goes through, which is bolted to the chassis? edit: \/\/\/\/\/ seen. Slavvy fucked around with this message at 00:33 on Jan 20, 2013 |
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# ? Jan 20, 2013 00:28 |
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Rather than have the pivot point bolt into a flat surface, it would be better to have the pivot point in a big C, like this:code:
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# ? Jan 20, 2013 00:30 |
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This is all well and good, but if you look reallllll close at the rockers you'll see the dampers are in double shear anyway. No (sane) engineer would put a bolt that important into single shear, that's like babytown frolicks. jammyozzy fucked around with this message at 00:35 on Jan 20, 2013 |
# ? Jan 20, 2013 00:32 |
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Not seeing a second mount point for the cantilevers. What's up with the N-arms anyway?
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# ? Jan 20, 2013 07:16 |
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Those rockers aren't just bolted down; there's a big boss sticking out of the transmission case that they pivot on. The bolt is just keeping it in place and not under any shear loading. And the upper arm is n-shaped to provide toe adjustment and ensure there isn't any bump steer (like there would be if the toe link was not in the plane of one of the a-arms).
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# ? Jan 20, 2013 07:20 |
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jammyozzy posted:This is all well and good, but if you look reallllll close at the rockers you'll see the dampers are in double shear anyway. Look here, it's the palatov dp4. Look at all that single sheer. But we all know that palatov guy's rich and does whatever he wants: And everyone's favorite, the C7 cervette. What were they thinking those steering links and ball joints are gonna just fly apart the moment it steps onto pavement. GM junk I guess. And look at this moron, trusting his life to a single sheer fork. Serves him right for trying to be a unique snowflake when physics is involved: And the god engineer must be smoking white pebbles, because this poo poo is in single sheer as well. I mean really, why doesn't the trunk connect to ground twice. Sloppy design if you ask me.
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# ? Jan 20, 2013 18:03 |
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Giblet Plus! posted:And the god engineer must be smoking white pebbles, because this poo poo is in single sheer as well. I mean really, why doesn't the trunk connect to ground twice. Sloppy design if you ask me. Banyan trees are clearly superior in design
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# ? Jan 20, 2013 18:09 |
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If anyone watched the barrett Jackson auction last night, there were two pretty awesome AI sales. The original bat mobile for 4.2 million, and the first production C7 for 1,050,000
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# ? Jan 20, 2013 18:09 |
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Those are all examples of well-engineered single shear connections, the bolts and connections are clearly beefy enough to withstand the dynamic forces they'll see, and then some. I'm betting most of the guys getting all up tight here remember that terrible SEMA truck from a few years back, each corner was supported by two 1/2" bolts in single shear and it went to poo poo from bouncing off a dirt mound the size of a parking block. story here
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# ? Jan 20, 2013 18:24 |
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I took an engineering class specifically designed to teach shear, bending and torque. It's pretty easy to design for and single point shear is considered ethical engineering design if proper analysis has been done. Also as long at the mount isn't threaded. That is considered poor engineering regardless of how high the safety factor is.
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# ? Jan 20, 2013 18:45 |
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Alright maybe I was a bit over-dramatic and should have said no engineer would do that without good cause and justification. As penance, pictures:
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# ? Jan 20, 2013 19:05 |
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rcman50166 posted:I took an engineering class specifically designed to teach shear, bending and torque. It's pretty easy to design for and single point shear is considered ethical engineering design if proper analysis has been done. Also as long at the mount isn't threaded. That is considered poor engineering regardless of how high the safety factor is. I graduated as a Master of Mechanical Engineering in 1990. Unless something has severely changed since then, you're perfectly right.
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# ? Jan 20, 2013 20:17 |
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rcman50166 posted:I took an engineering class specifically designed to teach shear, bending and torque. It's pretty easy to design for and single point shear is considered ethical engineering design if proper analysis has been done. Also as long at the mount isn't threaded. That is considered poor engineering regardless of how high the safety factor is.
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# ? Jan 20, 2013 21:00 |
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I assume that he means that the point where contact is made isn't threaded, considering surface area and all that?
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# ? Jan 20, 2013 21:38 |
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A friend's corolla:
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# ? Jan 20, 2013 21:40 |
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This seems like an old VHS video so I'd imagine it's been posted before. Guy drifts two BMW's at once (presumably with a steering/throttle lock). https://www.youtube.com/watch?v=GE1VTWFDEFg
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# ? Jan 20, 2013 23:05 |
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Skeletard posted:I assume that he means that the point where contact is made isn't threaded, considering surface area and all that? You just design for the reduced area, I've seen a lot of perfectly safe designs that use single shear bolted connections. Rear shocks on my car mount to the hub in single shear with one bolt and they will punch through the upper mount before they shear that bolt. I've seen a lot of shoulder bolt connections in manufacturing that have lasted for a very long time. Ideal design is a double shear, straight pin connector but in the real world engineering requires many compromises because of space or ease of assembly. Crustashio fucked around with this message at 00:04 on Jan 21, 2013 |
# ? Jan 20, 2013 23:22 |
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Sagebrush posted:Hey, at least she's not like my friend's cousin, who told us all at dinner once, in no uncertain terms, that if her would-be-fianc didn't get her a diamond worth at least three months' salary she would leave him on the spot. That would be around twenty thousand dollars for the poor guy (not in attendance that night) she was dating at the time. Because anything less than that would show that he didn't respect her, you see. So he left her right? Cause ultimatums are not good ways to start marriages. (USER WAS PUT ON PROBATION FOR THIS POST)
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# ? Jan 20, 2013 23:48 |
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Rev. Dr. Moses P. Lester posted:What do you mean exactly, "as long as the mount isn't threaded"? As long as the cantilever that experiences the shear force isn't threaded it is ok. An easy way to fix this is to simply use a shouldered bolt. Crustashio posted:You just design for the reduced area, I've seen a lot of perfectly safe designs that use single shear bolted connections. Rear shocks on my car mount to the hub in single shear with one bolt and they will punch through the upper mount before they shear that bolt. I've seen a lot of shoulder bolt connections in manufacturing that have lasted for a very long time. Ideal design is a double shear, straight pin connector but in the real world engineering requires many compromises because of space or ease of assembly. That is the problem. You don't design for the reduced area. Stress risers experienced during shear make it more vulnerable to failure than a rod of the same diameter as the minor diameter of the bolt thread. That assumption is one of the reasons it's a no no. You may have seen plenty of designs but it's not considered ethical engineering because a better solution exists with minimal design change. rcman50166 fucked around with this message at 00:50 on Jan 21, 2013 |
# ? Jan 21, 2013 00:45 |
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jamal posted:A friend's corolla: Come on man, you know better than that. Just throwing a picture like that into the thread and leaving? We gotta have a link.
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# ? Jan 21, 2013 00:46 |
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I see single shear in mounts all the time - for instance shock mounts are frequently single shear. EightBit's example of how to make something double shear is really not a good idea though, because if you connect the mount tabs on each side of the bolt together with a plate that's parallel to the bolt, you've barely increased the strength at all. You need triangulation / a gusset that shares load equally between the two mount tabs to make a truly effective double shear mount point.
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# ? Jan 21, 2013 00:59 |
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kastein posted:I see single shear in mounts all the time - for instance shock mounts are frequently single shear. The point I'm making is single shear design is okay. Single shear (or any shear for that matter) on a full length threaded bolt or any bolt where shear takes place on the threaded section of it is not okay. Examples of that is seen everywhere including older F1 cars. But it's still poor engineering and unethical if designed deliberately despite knowing the problems caused by it.
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# ? Jan 21, 2013 01:05 |
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My example was pretty lovely for sure, but it was basically a bar-napkin diagram just to illustrate a concept, not a practical engineering solution.
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# ? Jan 21, 2013 01:55 |
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Shut up about that "sheer" crap. Post more awesome AI poo poo!
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# ? Jan 21, 2013 02:16 |
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Holy poo poo, this thread gets derailed way too often over stupid stuff. Shut up and post more loving awesome AI pictures. I think the thread needs a new rule: every post must have a photo.
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# ? Jan 21, 2013 02:37 |
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"There are but three true sports--bullfighting, mountain climbing, and motor-racing. The rest are merely games." -Hemingway Preoptopus fucked around with this message at 04:55 on Jan 21, 2013 |
# ? Jan 21, 2013 04:45 |
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Crazy engines in old Volvos? I'm game! https://www.youtube.com/watch?v=ymi0xkErqWI https://www.youtube.com/watch?v=DKXSk0BS-5M
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# ? Jan 21, 2013 05:38 |
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jamal posted:A friend's corolla: This friend doesn't live in AZ does he?
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# ? Jan 21, 2013 07:49 |
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Long Beach.
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# ? Jan 21, 2013 08:50 |
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jamal posted:Long Beach. Ok, my fiat was injured by an unsecured EZUP belonging to a almost identical car at import face off a while back. No dice on getting paid.
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# ? Jan 21, 2013 08:55 |
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# ? May 30, 2024 13:11 |
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https://www.youtube.com/watch?v=ridS396W2BY The truck in the video is loaded with 40 tons of stuff.
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# ? Jan 21, 2013 11:15 |