http://citycyclingedinburgh.info/bbpress/ CityCyclingEdinburgh Forum » Topic: Repurposing bicycle components en Wed, 13 May 2026 04:27:40 +0000 http://citycyclingedinburgh.info/bbpress/topic.php?id=17977&page=2#post-256691 Fri, 04 Aug 2017 16:31:48 +0000 kaputnik 256691@http://citycyclingedinburgh.info/bbpress/ <p>Those who guessed wool are of course very close. It's not specifically a wool winder though, although winding wool is what it does.</p> <p>We tested it under hand crank power this afternoon and it worked, although it proved the weakness of the design of the wooden blocks on the "drive" wheel in that the tension of the wool pulled them away from the rim, because I had to chop off the rounded extensions (as seen on the "free" wheel) which were fouling the chain. I will create new blocks that slot inside the rim for strength and stability. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977&page=2#post-256680 Fri, 04 Aug 2017 13:53:14 +0000 dessert rat 256680@http://citycyclingedinburgh.info/bbpress/ <p>the little eye hooks have me stumped. Got to be something thin/light like fishing line / thread / wool, as the bista wood things wouldn't take any weight.</p> <p>Things it could be used to wind up:<br /> - thread<br /> - wool<br /> - hair (eg Rapunzel)<br /> - CCE members </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977&page=2#post-256679 Fri, 04 Aug 2017 13:46:35 +0000 Frenchy 256679@http://citycyclingedinburgh.info/bbpress/ <p><em>For holding and winding up a hosepipe in the garden?</em></p> <p>Definitely for winding <em>something</em> up. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977&page=2#post-256666 Fri, 04 Aug 2017 09:31:44 +0000 ARobComp 256666@http://citycyclingedinburgh.info/bbpress/ <p>For holding and winding up a hosepipe in the garden? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977&page=2#post-256660 Fri, 04 Aug 2017 08:50:54 +0000 dougal 256660@http://citycyclingedinburgh.info/bbpress/ <p>You can still knit with the remainder of your fingers. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256657 Fri, 04 Aug 2017 08:16:30 +0000 Cyclingmollie 256657@http://citycyclingedinburgh.info/bbpress/ <p>A wool winder? The chain tensioner will also act as a safety feature as the chain will ride over a finger that gets between it and a geared wheel. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256653 Fri, 04 Aug 2017 07:23:05 +0000 gembo 256653@http://citycyclingedinburgh.info/bbpress/ <p>Either a printing press for slow printing of artworks or a giant flywheel for catching dreams? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256652 Fri, 04 Aug 2017 06:46:14 +0000 wingpig 256652@http://citycyclingedinburgh.info/bbpress/ <p>Giant kite string winder? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256650 Thu, 03 Aug 2017 23:50:02 +0000 kaputnik 256650@http://citycyclingedinburgh.info/bbpress/ <p>Aha. Just as well I went with a hacked off bit of straight handlebar then :)</p> <p><a href="https://flic.kr/p/X8Yn7N"><img src="https://farm5.staticflickr.com/4389/36189835022_33f371359f.jpg"></a><a href="https://flic.kr/p/X8Yn7N">Thingamatron Mk.1</a> by <a href="https://www.flickr.com/photos/kaputniq/">andy a</a>, on Flickr</p> <p>Any guesses? I've tested it out by spinning the wheels by hand and it works as intended, although not yet tried completing its mission under hand cranking.</p> <p>Will be disassembled and smoothed and cleaned up for varnishing. Some tweaking needed of the fine details like those little eye hooks on the base.</p> <p>I dissasembled the chain tensioner and replaced the bolt that would normally screw into the derailleur hanger with a long M6 bolt and some handy sized round-bodied bolts that were the same diameter as the original axle. That meant I didn't need to try and mash a hanger in there to mount it on, I could bolt it straight through the timber after cutting a little recess for it to sit in. The end of the tensioning spring catches perfectly on the timber so the whole thing pulls the excess chain slack in the way.</p> <p>My "blueprint" above suggested mounting them in series using a shaft from one to the next. However that would be very long and rigid. I think mounting them in parallel using a chain to transfer the drive from one of the unused rings of the chainwheel is a better idea. You just make more of these but without the handle assembly and chain them all together. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256590 Thu, 03 Aug 2017 11:13:15 +0000 Arellcat 256590@http://citycyclingedinburgh.info/bbpress/ <p><em> it struck me that a square taper BB has an M8 (I think) thread</em></p> <p>Yes but no.</p> <p>Crank bolts are M8 fine, which is a 1.0mm thread pitch. Ordinary M8 has a 1.25mm pitch. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256585 Thu, 03 Aug 2017 10:25:27 +0000 kaputnik 256585@http://citycyclingedinburgh.info/bbpress/ <p>I am pleased to report that a test run of the contraption last night (without the chain drive, turning by hand) was successful. I just need to add a cassette to the freehub and sort out the driveshaft for a trial under crank power.</p> <p>Then it will all be taken apart to sand and varnish the wood and scrub up the bicycle parts so they are free from grime.</p> <p>Speaking of driveshafts, rather than ram a piece of 15mm pipe on permanently, it struck me that a square taper BB has an M8 (I think) thread cut into it for the crank retaining bolt. I was thinking about putting a long bolt in there from which the head has been cut off and (if the threaded directions cooperate) using that as the driveshaft. It means it can easily be taken apart for fiddling. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256493 Wed, 02 Aug 2017 09:54:45 +0000 wingpig 256493@http://citycyclingedinburgh.info/bbpress/ <p>Maybe a <img src="https://upload.wikimedia.org/wikipedia/commons/3/35/Wimshurst.jpg">? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256476 Tue, 01 Aug 2017 22:57:20 +0000 I were right about that saddle 256476@http://citycyclingedinburgh.info/bbpress/ <p><a href="http://www.waghornswood.net.nz/Manuals/Vehicles/Triumph/Engines/triumph_slant_4_engines_1854cc_and_1998cc_training.pdf">Page 36 for anyone else wondering what a Triumph slant-four slipper head chain tensioner is.</a> </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256472 Tue, 01 Aug 2017 22:28:43 +0000 Arellcat 256472@http://citycyclingedinburgh.info/bbpress/ <p>Most chain tensioners in recumbentry are either repurposed dérailleurs or one or two pulley wheel(s) on a sprung arm. Or you could go Triumph slant-four, and have a metal plain bearing that simply runs against the (camshaft timing) chain to provide the requisite tension.</p> <p>I always loved how W Heath Robinson never seemed to have a piece of string without a knot tied in it.</p> <p><em>shaft to next wheel in series</em></p> <p>I'm hoping it leads to sector gears, number wheels and carry propagation columns.</p> <p><a href="https://flic.kr/p/8PUaip"><img src="https://farm5.staticflickr.com/4017/5136549797_025bc9baed_n.jpg"></a><br /> <a href="https://flic.kr/p/8PUaip">And now for something completely difference</a> </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256427 Tue, 01 Aug 2017 15:34:22 +0000 wingpig 256427@http://citycyclingedinburgh.info/bbpress/ <p>Stick an old derailleur pulley sideways half-day along the chain run and put the chain through the middle? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256416 Tue, 01 Aug 2017 14:17:59 +0000 gembo 256416@http://citycyclingedinburgh.info/bbpress/ <p>Wind the bobbin up? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256414 Tue, 01 Aug 2017 14:02:26 +0000 kaputnik 256414@http://citycyclingedinburgh.info/bbpress/ <p>Who needs Victorian children when I have one of my own?</p> <p>I hadn't yet considered that a belt/friction drive running inside the rim might be an alternative to the chain, but given then way the wheel is cantilevered out from the wood it might not be a great idea to put a drive band around it. Plus I'm pretty keen to use as much bicycle bits in this as possible.</p> <p>Hmm. Having looked into it, using nitrile rubber O-ring or Urethane belting material, which can be joined into a loop fairly easily would be a less complex drive system. Fortunately, I'll go with the more complex bicycle-shaped option as what I need to attach to the wheels would foul the rim from acting as a pulley. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256409 Tue, 01 Aug 2017 13:54:45 +0000 I were right about that saddle 256409@http://citycyclingedinburgh.info/bbpress/ <p>Shaft to next wheel in series? You're setting up a hand-cranked cotton mill staffed by Victorian children? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256408 Tue, 01 Aug 2017 13:50:25 +0000 kaputnik 256408@http://citycyclingedinburgh.info/bbpress/ <p><a href="https://flic.kr/p/X7FH4F"><img src="https://farm5.staticflickr.com/4315/36175268721_83dcd25abb.jpg"></a><a href="https://flic.kr/p/X7FH4F">Plans</a> by <a href="https://www.flickr.com/photos/kaputniq/">andy a</a>, on Flickr</p> <p>You get the idea (but not what it actually does, beyond rotates a bike wheel affixed through a piece of wood)</p> <p>Chain tension will be an issue as it will inevitably sag off the driving sprocket. If I wasn't wanting to do this on the cheap I'd get an eccentric BB for the bottom one. Who knows, I might get lucky at the bike station, or pick up a tensioner that I can incorporate somehow. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256403 Tue, 01 Aug 2017 13:27:25 +0000 I were right about that saddle 256403@http://citycyclingedinburgh.info/bbpress/ <p>@kaputnik</p> <p>Copper is both malleable and ductile. Like most problems, this one can be solved with a hammer. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256401 Tue, 01 Aug 2017 13:22:14 +0000 kaputnik 256401@http://citycyclingedinburgh.info/bbpress/ <p>Then according to my calculations the diagonal section will be between 17.3 and 17.8mm (probably a bit less when accounting for the curved corners of the spline), and the circumference would be about 49.2mm, meaning a piece of 15mm pipe with a 38.7mm diameter is unlikely to stretch around it, I ideally need a piece of at least 15.6mm pipe! You can get Stainless Steel or Aloominum pipes with a 17mm internal diameter, that might do the trick. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256394 Tue, 01 Aug 2017 12:55:12 +0000 wingpig 256394@http://citycyclingedinburgh.info/bbpress/ <p>JIS: 12.65mm<br /> ISO: 12.33mm<br /> ...according to <a href="https://bicycles.stackexchange.com/questions/10186/how-can-i-tell-the-difference-between-a-j-i-s-and-iso-square-taper-bottom-brack" rel="nofollow">https://bicycles.stackexchange.com/questions/10186/how-can-i-tell-the-difference-between-a-j-i-s-and-iso-square-taper-bottom-brack</a></p> <p>I'm going with <img src="https://en.wikipedia.org/wiki/Zoetrope#/media/File:Zoetrope.jpg"> </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256389 Tue, 01 Aug 2017 11:53:29 +0000 kaputnik 256389@http://citycyclingedinburgh.info/bbpress/ <p>Quick question if anyone knows (or has one and some Vernier calipers handy), what is the "diameter" of the end of a square taper BB spindle?</p> <p>P.S., nice suggestions above, but you're all wrong;</p> <p><img src="https://bellasemplicita.files.wordpress.com/2011/12/heath_robinson_pancake.jpeg"> </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256388 Tue, 01 Aug 2017 11:51:07 +0000 I were right about that saddle 256388@http://citycyclingedinburgh.info/bbpress/ <p>Me too.</p> <p><img src="http://s.hswstatic.com/gif/10-medieval-torture-devices3.jpg"> </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256386 Tue, 01 Aug 2017 11:47:57 +0000 dessert rat 256386@http://citycyclingedinburgh.info/bbpress/ <p>I am very much looking forward to the next not-PY</p> <p><a href="https://flic.kr/p/X7x55B"><img src="https://farm5.staticflickr.com/4303/36173583411_e98983d874.jpg"></a> </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256384 Tue, 01 Aug 2017 11:41:26 +0000 kaputnik 256384@http://citycyclingedinburgh.info/bbpress/ <p>The bottom bracket solution is perfect actually, as it means that future parts of the contraption can be added in series, driven by another shaft from the other side of the BB, all turned by the original crank handle.</p> <p>A trip to the Bike Station ensues this afternoon. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256381 Tue, 01 Aug 2017 11:27:03 +0000 I were right about that saddle 256381@http://citycyclingedinburgh.info/bbpress/ <p>Cartie in my youth. </p> <p>The last time I had to get something welded (Allen key onto a great long steel rod) I took it to the blacksmith on corner of Willowbrae Road and Duddingston Road. £5 cash in hand, cheaper than that glue... </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256380 Tue, 01 Aug 2017 11:22:12 +0000 kaputnik 256380@http://citycyclingedinburgh.info/bbpress/ <p>Most of the useful articles I've found online are about folk custom-building go carts / carties / guiders / bogeys. </p> <p>I came across something called "J-B Weld Steelstik" which is an epoxy putty adhesive that's meant for attaching steel to steel in lieu of welding; <a href="http://www.jb-weld.co.uk/j-b-weld-epoxy-putty-sticks/j-b-weld-steelstik-epoxy-putty" rel="nofollow">http://www.jb-weld.co.uk/j-b-weld-epoxy-putty-sticks/j-b-weld-steelstik-epoxy-putty</a> </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256378 Tue, 01 Aug 2017 10:58:39 +0000 I were right about that saddle 256378@http://citycyclingedinburgh.info/bbpress/ <p><em>perhaps a circular piece of pipe that could be jammed in to a square taper bracket at one end?</em></p> <p>Bit of 15mm copper pipe? Soft enough to take the square shape with a bit of hammering and then a bit of epoxy resin? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=17977#post-256369 Tue, 01 Aug 2017 10:08:19 +0000 kaputnik 256369@http://citycyclingedinburgh.info/bbpress/ <p>Guider round my way (or at least, my dad's 1950s childhood in Gorgie way).</p> <p>I am liking your suggestion IWRATS. The only thing to overcome is what to do if I want to extend the driveshaft so that the crank is mounted about a foot away from the sprocket that is driving the chain. perhaps a circular piece of pipe that could be jammed in to a square taper bracket at one end?</p> <p>I am not spinning wool, although you're not a million miles away. </p>