tag:blogger.com,1999:blog-8634965595428261031.post8072426332770641416..comments2024-02-13T10:35:04.139-05:00Comments on SPRFLS: Dah Shinin'Unknownnoreply@blogger.comBlogger52125tag:blogger.com,1999:blog-8634965595428261031.post-51260085875428491892009-02-08T11:39:00.000-05:002009-02-08T11:39:00.000-05:00OK Bman. Three of the books that I want you to rea...OK Bman. Three of the books that I want you to read that sufficiently cover this topic and for you to make a connection with Profile crank design and manufacturing derived flaws. But I doubt you would be able to. <BR/><BR/>Yes I remember the terms as I did 5 years ago. You have to read it all to come across the terms because books don't have the search button. <BR/><BR/>Selection and Use of Engineering Materials, Butterworths<BR/><BR/>Standard Handbook of Fastening and Joining, Third Edition, Parmley<BR/><BR/>Machinery's Handbook, Industrial Press<BR/><BR/>YOU MADE ME CLIMB UP MY DARK AND DUSTY SPIDER RIDDEN ATTIC WITH A TORCHLIGHT JUST SO I CAN POST IN HERE TO WRITE UP ENGINEERING BOOK TITLES AT THE EXPENSE OF YOUR INCOMPETENCE.<BR/><BR/>FUCK YOU.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-18202136535949288352009-02-05T01:31:00.000-05:002009-02-05T01:31:00.000-05:00@bmanLeave google alone. It's overrated. The very ...@bman<BR/>Leave google alone. It's overrated. The very first web page brought up at Ask.com was a Patentstorm.us page. And a patent to help Marine drives that have two counter-rotating surfacing propellers. I'm just going to jump in the middle here... <BR/><BR/>In one aspect of the invention, simple, effective retaining structure is provided for holding the propeller-bearing-supporting spool in the horizontal bore of the torpedo fixed for non-rotation in each of the opposite rotational directions of the counter-rotating propellers. This prevents ROTATIONAL LOOSENING of the spool in each of the rotational directions as the propellers strike and pierce the surface of the water. <BR/><BR/>I'm no engineer so I don't know for sure what the fuck it means(maybe we need a retaining bolt to go through the bottom bracket shell and into the tube spacer to keep it from turning?) , but it does exist. I'm sure you could find more at the library if you wanted.<BR/> <BR/>Cars and bikes are different, their subjected forces are different, and their production tolerances are different. I sure as fuck wouldn't run a hollow 3/8th axle on my car(or on my bike, but that's not the point.)<BR/><BR/>In my opinion, Profiles are good cranks for the money and Twombolts are good if you're real smooth. I'm running a pair of 175mm Powerbites that I got used and have been running for about five years . I'd like some longer cranks, but don't have the money. So I might just run them until they break.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-9685202337875773022009-02-03T15:18:00.000-05:002009-02-03T15:18:00.000-05:00Splined axles on race cars don't loosen because of...Splined axles on race cars don't loosen because of the way they are attached. There's usually a castle nut, and the shaft has a hole across it for a cotter pin. If they were attached with a bolt and an aluminum washer, they would loosen up, and the splines would get chewed right before the wheel falls of. In many automotive applications the tolerance is tighter, requiring the parts to be pressed together, so this limits the ability for it to rock back and forth. Also there are spline interfaces on cars that have a pinch bolt. <BR/><BR/>Most of all forces are just not the same. Analysing this doesn't take a degree just common sense. Ther is not part of a car that is having a 150lb. load dropped on it from 3 to 10 feet, that load acting in opposite directions on one shaft and being imparted by two levers 180mm long. If something with an engineering degree does want to do a stress analysis on that scenario, I'd love to read it.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-14998174831371804712009-02-03T10:37:00.000-05:002009-02-03T10:37:00.000-05:00"I said got to the library. Do you really think al..."I said got to the library. Do you really think all the published engineering literature in the world can be accessed through the Internet?"<BR/><BR/>what so you mean my local library, which serves the needs of a normal ommunity will have an esoteric tome on engineering and google wont? engage your brain mate.<BR/><BR/>have you ever been onto google books? pretty much every recomended text will be on there.<BR/><BR/>or at least give me a name of a book so i can download it.<BR/><BR/>dont be such a condescending little shit.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-5466981481449743972009-02-03T08:49:00.000-05:002009-02-03T08:49:00.000-05:00Anonymous above...some punctuation please!Anonymous above...some punctuation please!G.S.GUCCILIFEhttps://www.blogger.com/profile/05793222737479346592noreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-42576852569172029682009-02-02T23:15:00.000-05:002009-02-02T23:15:00.000-05:00this guy above me needs a friend wow chill out bro...this guy above me needs a friend wow chill out bro glad you got a degree sweet but man smoke some weed and chill mud boogers use these splined axles and a steal 15x14 bart wheel with 44 inch boogers weighs a ton on top of what a booger weighs and if your telling me that you don't start and stop a hundred times with 1000 ft pounds of torque and that i put more torque than that on my cranks your crazyAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-45696778888030017262009-02-02T23:03:00.000-05:002009-02-02T23:03:00.000-05:00Also you dumb fucks that spewing the more than 30 ...Also you dumb fucks that spewing the more than 30 years bullshite haven't thought don't have the mental capacity to distinguish between a FLAWED design and nonfunctional design.<BR/><BR/>Read what I wrote some posts up. 1" threaded headsets were a flawed design. So they were used on bicycles for more than a hundred years, and continue to be used today even though they are crap.<BR/><BR/>So by your definition they are a competent design only because they are used for more than 100 years and millions of bicycles? <BR/><BR/>Also a lot of people are too dumbfucked to think that freestyle riders subject their cranks to forces similar to interfaces on a cars steering column and axles.<BR/><BR/>If you think that's the case, YOU'RE<BR/>DUMB.<BR/><BR/>Yeah cars jump with a long lever sticking out of their splined interfaced axle and land on ramps repeatedly and get banged from 3 to 6 feet on this lever on occasion.<BR/><BR/>YOU ARE REALLY AS DUMB A PILE OF ROCKS.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-24088016072509632152009-02-02T22:48:00.000-05:002009-02-02T22:48:00.000-05:00I said got to the library. Do you really think all...I said got to the library. Do you really think all the published engineering literature in the world can be accessed through the Internet? <BR/><BR/>This is what I was talking about, people are too dumb and thick to think that all the world's literature can be found in Google. You are as dumb as a pile of rocks. <BR/><BR/>Find engineering books about fasteners. The last time I checked there were at least 3 engineering books that mentioned this.<BR/><BR/>Also look up on welding deformation and it affects on tolerances, HAZ, <BR/>coupling interfaces, splined interfaces and the affect of <BR/>cumulative tolerances.<BR/><BR/>I don't have to explain myself and prove to you the established science and physics of the engineering world in a copule of paragraphs if you are too dumb to open a printed book. <BR/><BR/>Why do I have to waste my time at the expense of people's ignorance?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-76776215058782213632009-02-02T15:16:00.000-05:002009-02-02T15:16:00.000-05:00I went through a particularly bad summer where I b...I went through a particularly bad summer where I broke something like three Profile arms. Having never been one to send in warranty cards, I wound up throwing them all out and getting a set of 41Thermals. Had no problem with them (except the bolts constantly got loose—like, really loose). Got Wombolts when they first came out, broke my first set like everyone else. The second pair, a set of neon yellow ones, is still going strong.<BR/><BR/>Seems to me that Profile Race cranks are better left to racers, but obviously there are a ton of people who run them with no problems.Russhttps://www.blogger.com/profile/03648040810233420802noreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-76127850457015417842009-02-02T14:38:00.000-05:002009-02-02T14:38:00.000-05:00Profile's biggest sin is that all their parts BUT ...Profile's biggest sin is that all their parts BUT the cranks are insanely overpriced. The cranks are pretty reasonably priced. I know people who have had the same sets for more than 10 years so the reliability isn't too much of an issue for most people. <BR/><BR/>Anyone who is really convinced that Profile is shite obviously hasn't spent time installing a 1 piece crank, bending it, then jumping down the same steps with the cranks the opposite way to bend them back. Or do a pedal picker both ways to bend them back. At 12.00 each, you could buy more than 10 pairs of Odyssey Excaliburs for what a pair of GT or Profile or Redline 3 pieces would cost you. this was a tragically common scenario bitd.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-51226038253385923262009-02-02T14:26:00.000-05:002009-02-02T14:26:00.000-05:00I'm sure jumping a 4 stair is much worse than dump...I'm sure jumping a 4 stair is much worse than dumping a transbrake at 6,500 RPM and pulling the front end of the car 2 feet off the ground. Keep in mind that is 3 splined connections holding up in that scenario, the front of the driveshaft and either side of differential (which are normally 31-35 splines) This guy is right, the only reason profile hasn't needed to change their design in 30 years is because it is so bad, and everyone rides them for the sole reason that they can't find anything else.Unknownhttps://www.blogger.com/profile/03233087132894270734noreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-72974925792654531732009-02-02T11:44:00.000-05:002009-02-02T11:44:00.000-05:00"counter rotational loosening"cant say ive ever he..."counter rotational loosening"<BR/><BR/>cant say ive ever heard of it<BR/><BR/>book search, google search came up with nothing mate. find me a link or explain it yourself. is that fancy term for jiggling it about and it gets loose?<BR/><BR/>quit with the appeals to authority and actually explain yourself.<BR/><BR/>youve yet to adequately explain how a design that performs well in the automotive applications is so woefully inadequate.<BR/><BR/>if you as the engineer you claim to be, looks at profiles and despairs, take the time and help your fellow bmxers and explain to us why you are right in a civil manner instead of calling us retards etc.otherwise then you clearly dont want to help us and your arguments against profiles are most likely rooted in some juvenile objection rather than intelligent engineering analysis of their design.<BR/><BR/>i simply find it hard to believe that bmx can cause parts to fail where a racing car does not?<BR/><BR/>seriously im interested in knowing. fine im a retard, but what does that make you if you really wont explain this to me, O wise one?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-33460805391796947222009-02-02T09:18:00.000-05:002009-02-02T09:18:00.000-05:00I like my chrome profiles almost as much as I like...I like my chrome profiles almost as much as I like chromed out bikes. That Kink would look better with gold rims, Mad Dog style.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-69343136787791251452009-02-01T23:46:00.000-05:002009-02-01T23:46:00.000-05:00i read through the article it doesn't even mention...i read through the article it doesn't even mention cranks anywhere in it you people are wild so much passion over bmx cranks wow!!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-72851676010138194522009-02-01T18:56:00.000-05:002009-02-01T18:56:00.000-05:00If your Profile Cranks have developed the so calle...If your Profile Cranks have developed the so called "Profile Wobble", there's a simple solution, that requires a bit of simple forethought as well as actually reading the instructions that came with the cranks when you bought them.<BR/><BR/>Step 1. Save your reciept and warranty card. Put in in your top dresser drawer, for instance.<BR/><BR/>Step 2. If you notice this wobble, or you're having problems with your cranks loosening up, call Profile and arrange to exchange them.<BR/><BR/>The end result is you have a new set of arms and all it cost you was postage. The only thing Profile asks of you is proof of purchase.<BR/><BR/>Not that complicated, is it?<BR/><BR/>The fact is, modern street riding is going to damage any set of cranks eventually. Inspect your shit before you ride.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-90454245675055559812009-02-01T16:14:00.000-05:002009-02-01T16:14:00.000-05:00your clothes, give them to me.your clothes, give them to me.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-19130053711827851012009-02-01T09:18:00.000-05:002009-02-01T09:18:00.000-05:00Beau: I'd go with the Eclats if I knew that they h...Beau: I'd go with the Eclats if I knew that they had a warranty. I can't seem to find out whether they do or not. I sure as hell am not spending $180 on cranks without knowing if they have a warranty.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-11622909261676408392009-02-01T01:23:00.000-05:002009-02-01T01:23:00.000-05:00Yeah why ride flexy cranks, just buy Twombolts the...Yeah why ride flexy cranks, just buy Twombolts they will just snap instead, making it easier to decide when to replace them. If I didn't happen to have profiles I got a few years ago and was in the market, I would probably go for either the Eclats or Solids, why would you bother with anything else?Unknownhttps://www.blogger.com/profile/03233087132894270734noreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-40884461113996420392009-01-31T22:40:00.000-05:002009-01-31T22:40:00.000-05:00Anonymous@8:33: I know they're the wrong cranks fo...Anonymous@8:33: I know they're the wrong cranks for me. I wanna get Twombolts eventually. I just can't afford to get some new cranks, hence I'm still running the Profiles. They didn't cost me much though, so I don't have a lot to complain about.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-55919141198339573962009-01-31T20:33:00.000-05:002009-01-31T20:33:00.000-05:00They flex (I have a ding in my CS from that...)Wro...<I>They flex (I have a ding in my CS from that...)</I><BR/><BR/>Wrong cranks for you, then. Run squarer arms -- and shorter, if you can stand it.<BR/><BR/>I land flat a lot, always with my feet in the same position, and I found some fractures in the chrome on my Profiles from flexing the same way every time. Made me nervous. So I switched them out for some DK Social 170s -- catalog arms, I know, but it was an experiment.<BR/><BR/>I've run them for about a year now, and there's no wobble, no visible stress marks, nothing. They're surprisingly well-crafted (wraparound on both ends, burly bosses, great welds), and they're <I>really</I> stiff.<BR/><BR/>Try 'em. They're cheap.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-65779033113931045042009-01-31T17:52:00.000-05:002009-01-31T17:52:00.000-05:00my promise still stands russ: you will see more o...my promise still stands russ: you will see more of the chrome mystic this year than you ever wanted. i'm sorry i don't have any photos of the bike on it's own right now, but hopefully by summer i'll have provided enough evidence to win your forgiveness. <BR/><BR/>keep calling me out if you must, i can stand the heat!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-25311496351995089532009-01-31T16:43:00.000-05:002009-01-31T16:43:00.000-05:00My Profiles were used for quite a while before I g...My Profiles were used for quite a while before I got them about 5 months ago. Still no wobble and they seem fine, I just don't like them. They flex (I have a ding in my CS from that...) and the spindle bosses aren't thick enough around the bolt heads. The left one got bashed in by the last owner. I had to file that, file the washer, then hammer in the washer so I could use flush bolts.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-51167697072896274502009-01-31T16:21:00.000-05:002009-01-31T16:21:00.000-05:00owned a few sets of profiles, installed correctly,...owned a few sets of profiles, installed correctly, blah blah. always get the wobble after a few months.<BR/><BR/>broke wombolts, what else is new.<BR/><BR/>primo has always done me well, but solid bitch cranks are next on my list.bkhttps://www.blogger.com/profile/03247418130398315964noreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-2289163724300938022009-01-31T16:20:00.000-05:002009-01-31T16:20:00.000-05:00The problem with Profile cranks and every crank li...The problem with Profile cranks and every crank like that is that it relies on just the crank bolts to hold the arms in place side-to-side and up-and-down. it's really too much to ask two 10mm bolts to do. The up-and-down forces from landing jumps and just pedaling are going to loosen the crank bolts unless they are torqued down and loc-tited. If the bottom bracket is not spaced properly this puts a side-load on the bearings as well.<BR/><BR/>With a pinch bolt setup the crank bolts simply keep everything located and the pinch bolts do all the holding work, and any sliding fit tolerance is taken up by tightening the pinch bolt. <BR/><BR/>The 48 spline setup would work better and not eventually wear out if it were a press-fit. You'd use the bolt to press the arm on and use a crank-puller to take it off.<BR/><BR/>The reason 48 splines work in automotive applications is because they are not recieving abrupt torsional loads in both directions. There is usually just continous power in one direction, the spline interface is not being rocked back and forth. This is why Profile cranks loosen up and eventually become un-useable, that and owners too lazy to tighten them up on a regular basis.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8634965595428261031.post-82980675089729454612009-01-31T15:12:00.000-05:002009-01-31T15:12:00.000-05:00if we all listed the cranks we've seen snap due to...if we all listed the cranks we've seen snap due to whatever, we would be reading all day. the only cranks i have ever broken was the shadow torrid crank, the the crank arm like..sheard in half, in the middle of the arm.<BR/><BR/>but i have never installed a crank improperly. or used hammers.<BR/>nor have i ever owned a set of profiles, or wombolts, and i never will.Anonymousnoreply@blogger.com