stuck cog
03-29-06, 05:17 AM
#26
Rising sun on Keirin rider
Join Date: Oct 2004
Location: Tokyo Japan
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It's my chainwhips
03-29-06, 07:03 AM
#27
don't pedal backwards...
Join Date: Jul 2005
Location: Minneapolis
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Bikes: Surly Long Haul Trucker set up for commuting and loaded touring, old Sekine road frame converted to fixed-gear, various beaters and weird bikes, waiting on the frame for my Surly Big Dummy build
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There is a tool (I saw one one time) that consists of two metal blocks that are clamped in a bench vice. Each block has two hardened pins protruding that are designed to grab two teeth on each side of the cog. You set the width to match the cog in question, clamp then securely in a bench vice, and then use the wheel for leverage.
I personally think that chainwhips and rotafixing put too much force on the cog threading unevenly, making removal harder than necessary. I can't prove it or anything, but it is my hypothesis that any kind of tool that applies force evenly around the stuck part will make removing it easier. You know those four-sided lug wrenches for cars? Same idea. Apply a pure rotational force to the fastener rather than forcing it to also act as a bushing to counter the uneven leverage of a wrench-like tool.
I personally think that chainwhips and rotafixing put too much force on the cog threading unevenly, making removal harder than necessary. I can't prove it or anything, but it is my hypothesis that any kind of tool that applies force evenly around the stuck part will make removing it easier. You know those four-sided lug wrenches for cars? Same idea. Apply a pure rotational force to the fastener rather than forcing it to also act as a bushing to counter the uneven leverage of a wrench-like tool.
03-29-06, 12:04 PM
#28
無くなった
Join Date: Mar 2004
Location: Sci-Fi Wasabi
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Bikes: I built the Bianchi track bike back up today.
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Originally Posted by MacG
There is a tool (I saw one one time) that consists of two metal blocks that are clamped in a bench vice. Each block has two hardened pins protruding that are designed to grab two teeth on each side of the cog. You set the width to match the cog in question, clamp then securely in a bench vice, and then use the wheel for leverage.
