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Monday, December 21, 2009 9:03:00 AM Categories: Chain case engineering problems maintenance


Broken off seat clamps

Sam is my friend although he is Scottish. The Scots are faultless (Hamish told me) but Sam does have one fault which is that every time he goes near a recumbent it breaks. No - hold - he has another fault which is that he oils his chains. - And actually he has another fault, which is that the bearded Celtic kilt-wearing bagpipe-playing Gaelic-speaking midge-slapping baaaaarstard doesn't bloody well clean the black ucky sticky horrible oil off his machines before handing them to me to fix. So I get oily fingers and oily bench-edges and oily inside-of-vans and oily bench-press-handles and no doubt other oily bits that I won't find till later when my wife draws my attention to oily shirts. Amazing what you brush a machine against when you bring it into the workshop.

I am therefore very kindly going to offer two Useful Tips as a timely present to all Scottish Persons before the New Year reduces them to the usual insensate alcoholic stupor.

1. Prior to getting someone to weld something back onto your machine, clean it. Clean oil off the frame. Clean oil off the front chainrings. Clean oil off the rear cluster. Clean oil off the underside of the handlebar and clean oil off the rear mech and the front mech and the idler wheel and the rear rack and the oily, black, disgusting back wheel-spokes. And finally clean oil off the cable housings. And if you are Scottish keep the resultant black rag and you can sell it to Canada when the Athabasca sands run out.
2. Whatever possesses you to oil your chain anyway? It only makes you feel better, not the chain. The chain is a tension member and needs lubricating only when it snakes its way round the chainrings or idler wheels. Road dust+oil is a penetrative lapping compound and helps to wear it out. Chain maintenance is done by waxing. This is not a new idea: 'tis as old as the bicycle. Remove chain; place in saucepan of wax; deep fry; remove; cool; replace. About once a month works for me and I don't even clean the chain before waxing because there never seems to be any dust to clean off because road dust doesn't stick to dry wax. (Though I graciously permit the use of oil inside a fully enclosed chaincase to which road dust doesn't have access.)
3. If you are Young and Disputatious and feel that I am a pedantic old git, which view has some merit because it does in fact happen to be the case, and you persist in besmearing your exquisite machines with inappropriate lubricants then removal of oil from hands is best effected with soap and sawdust. This isn't a new trick either; everyone did it until Swarfega advertising executives persuaded us daily to daub unknown chemicals on our hands at five o'clock and leave a ghastly black residue in the tea-room basin. Wet the fingers, rub a little soap on, and dip generously in sawdust. Make hand motions like Lady Macbeth. Rinse off and lo! the oil is stuck to the sawdust and you can go inside and play your violin with impunity.
4. If you weld a flat plate to the middle of a flimsy bit of box-section it had better be for a low-stress joint. Seat bases are not low-stress. Pedalling a recumbent produces a slight swaying motion of the pelvic girdle. Not many metals particularly enjoy constant twisting strains.
5. I can't count to two.
 
 
How the seat base is clamped

As a matter of fact when I ground all the paint off the broken bits of Sam's bike I found that it had broken before at the same place and someone had brazed the plates back on. They are now beefed up with small triangles and my big ugly blobby welds and we shall see how long it takes Sam to bust them again, and then we shall further see if he reads this blog because if he does, the sporran-swinging claymore-waving peat-burning oat-eating baaaaarstard'll then kindly return the machine to me in absolutely pristine condition and the sawdust quotient of his bathroom waste-pipe will be high but there won't be any oil on the holes of his chanter.
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