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Torpedo 5-speed pulley photo
I said a couple of posts back I'd submit
a picture of this little interesting thing. Well here it is. The bolt isn't the original one but an M5. Usually there is a bolt which has a very slightly curved head, then a "boxed shank" and only then threads. There is nothing to grip but that is just the beginning of this bolt's problems. This type of bolt is now and then found here and there (for example to hold the rack and fender stays, an sometimes the saddle pipe clamp tho then it is much bigger of course) - anyway those bolts are for some reason almost always visibly bent! I don't know why but so far I have replaced them with ordinary hexes... The nut is the original one which is of the type that is a combination of a pipe and nut, the nut part wider as to not fall thru the hole itself... http://user.it.uu.se/~embe8573/photo...eed-pulley.png Keep it up -- underground experts united .... http://user.it.uu.se/~embe8573 Emacs Gnus Blogomatic ......... http://user.it.uu.se/~embe8573/blogomatic - so far: 56 Blogomatic articles - |
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#2
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Torpedo 5-speed pulley photo
Any M5 stainless bolt and nut could replace that.
-- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 On 7/10/2016 1:51 AM, Emanuel Berg wrote: I said a couple of posts back I'd submit a picture of this little interesting thing. Well here it is. The bolt isn't the original one but an M5. Usually there is a bolt which has a very slightly curved head, then a "boxed shank" and only then threads. There is nothing to grip but that is just the beginning of this bolt's problems. This type of bolt is now and then found here and there (for example to hold the rack and fender stays, an sometimes the saddle pipe clamp tho then it is much bigger of course) - anyway those bolts are for some reason almost always visibly bent! I don't know why but so far I have replaced them with ordinary hexes... The nut is the original one which is of the type that is a combination of a pipe and nut, the nut part wider as to not fall thru the hole itself... http://user.it.uu.se/~embe8573/photo...eed-pulley.png Keep it up |
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Torpedo 5-speed pulley photo
AMuzi writes:
Any M5 stainless bolt and nut could replace that. It remains a mystery why the original ones are almost invariably slightly bent as there is no weight on the clamp. Some of those bikes have been around for decades tho... -- underground experts united .... http://user.it.uu.se/~embe8573 Emacs Gnus Blogomatic ......... http://user.it.uu.se/~embe8573/blogomatic - so far: 56 Blogomatic articles - |
#4
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Torpedo 5-speed pulley photo
On 7/10/2016 9:28 AM, Emanuel Berg wrote:
AMuzi writes: Any M5 stainless bolt and nut could replace that. It remains a mystery why the original ones are almost invariably slightly bent as there is no weight on the clamp. Some of those bikes have been around for decades tho... (sorry I top posted. oops) The faces of teh clamp are not parallel so under torque the bolt deforms as it's tightened. small problem compared to: http://seekingalpha.com/news/3192338...bsea-oil-wells bicycle content: http://www.sfgate.com/news/article/B...il-4555354.php those are one-inch bolts. Then there are the big ones: http://www.mercurynews.com/ci_236219...ate-metallurgy -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
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Torpedo 5-speed pulley photo
On Sun, 10 Jul 2016 08:51:56 +0200, Emanuel Berg
wrote: I said a couple of posts back I'd submit a picture of this little interesting thing. Well here it is. The bolt isn't the original one but an M5. Usually there is a bolt which has a very slightly curved head, then a "boxed shank" and only then threads. There is nothing to grip but that is just the beginning of this bolt's problems. This type of bolt is now and then found here and there (for example to hold the rack and fender stays, an sometimes the saddle pipe clamp tho then it is much bigger of course) - anyway those bolts are for some reason almost always visibly bent! I don't know why but so far I have replaced them with ordinary hexes... The nut is the original one which is of the type that is a combination of a pipe and nut, the nut part wider as to not fall thru the hole itself... http://user.it.uu.se/~embe8573/photo...eed-pulley.png Keep it up I've standardized "bicycle bolts" to stainless socket head (allen head) bolts. The don't rust, they look all right and I only need 4 allen wenches to work on my bicycle. Hardly necessary but I detest nasty old, rusty screws. I'm still wondering about the clamp on pulleys. They look like overkill unless the shift gear has an unusual strong spring. 5,7,9,etc., derailers have used a metal guide for years, apparently without problems. -- cheers, John B. |
#6
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Torpedo 5-speed pulley photo
John B. writes:
I've standardized "bicycle bolts" to stainless socket head (allen head) bolts. The don't rust, they look all right and I only need 4 allen wenches to work on my bicycle. Hardly necessary but I detest nasty old, rusty screws. Exactly. Often if you clean the area of the bolts and nuts and replace them this makes for a whole new bike. I also standardize but to hex bolts (M5s mostly) because they are pull- and holdable from the sides as well as the front, and this makes it very seldom they are so entrapped you have to remove something else to get to them. I'm still wondering about the clamp on pulleys. They look like overkill unless the shift gear has an unusual strong spring. 5,7,9,etc., derailers have used a metal guide for years, apparently without problems. You can try pulling the small chain and rod out of the hub with your hand, this I think requires more power so the wheels do help. -- underground experts united .... http://user.it.uu.se/~embe8573 Emacs Gnus Blogomatic ......... http://user.it.uu.se/~embe8573/blogomatic - so far: 56 Blogomatic articles - |
#7
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Torpedo 5-speed pulley photo
On Sun, 10 Jul 2016 09:51:26 -0500, AMuzi wrote:
On 7/10/2016 9:28 AM, Emanuel Berg wrote: AMuzi writes: Any M5 stainless bolt and nut could replace that. It remains a mystery why the original ones are almost invariably slightly bent as there is no weight on the clamp. Some of those bikes have been around for decades tho... (sorry I top posted. oops) The faces of teh clamp are not parallel so under torque the bolt deforms as it's tightened. small problem compared to: http://seekingalpha.com/news/3192338...bsea-oil-wells bicycle content: http://www.sfgate.com/news/article/B...il-4555354.php those are one-inch bolts. Then there are the big ones: http://www.mercurynews.com/ci_236219...ate-metallurgy I was surprised to read that about bolts holding up bridges. I had worked mainly for either the Air Force or the Oil Industry and both are pretty rigorous about specifications. The Oil companies even specified the thickness of the required paint, coat by coat, on an, above the ground, pipeline, on one contract. -- cheers, John B. |
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