Jaffacakes Posted February 10, 2006 Report Share Posted February 10, 2006 Has anyone got any ideas to get a cog off a rear wheel? We dont have a chain whip so is there a way to bodge one together?Cheers Quote Link to comment Share on other sites More sharing options...
PaRtZ Posted February 10, 2006 Report Share Posted February 10, 2006 Yumm.... jaffacakes.... This method is if you don't want it againBasically file/saw two parallel edges on the cog, put these two edges in a vice and rotate Quote Link to comment Share on other sites More sharing options...
Jaffacakes Posted February 10, 2006 Author Report Share Posted February 10, 2006 Yumm.... jaffacakes.... This method is if you don't want it againBasically file/saw two parallel edges on the cog, put these two edges in a vice and rotate We want the cog but we don't really care about the wheel. Quote Link to comment Share on other sites More sharing options...
Mark W Posted February 10, 2006 Report Share Posted February 10, 2006 You could try just wrapping a chain round the cog, then clamping that in a vice, then trying to turn the wheel off the cog. Alternatively, you can make a super burly chainwhip usin a block of wood, a length of chain and some screws.Lastly, the fun-but-sketchy way (Will it blow? ) would be to put the wheel into a bike with a fixed front chainring, then pedal backwards. DRAMA DRAMA Chain snap or cog removal. One or t'other.Boiling water is always a useful ally though. Quote Link to comment Share on other sites More sharing options...
PaRtZ Posted February 10, 2006 Report Share Posted February 10, 2006 Boiling water is always a useful ally though.Maybe Im not in tune with the whole hot water/freezing thing, but when I was getting my cog off my old cranks, it NEVER worked for me. I left the crank in freezer overnight, came back the next evening and poured water over the cog and it didn't do anything lol Quote Link to comment Share on other sites More sharing options...
Greetings Posted February 11, 2006 Report Share Posted February 11, 2006 Use a blowtorch. Put a chain arround the sprocket and then bock the chain in a vice as Onzaboymark says. IMO you'll have to use some kind of lever to unscrew the sprocket. Managed to unscrew a crank chainring today, in adition to heating the bloody thing up, i had to use a 1.5m lever which alone weighed about 25 kg (for tractor pulling )Heat is the best way, it steel expands quicker than aluminium and guess your cog is cr-mo and the hub body is aluminium. But don't put it into hot water, get it up to say 500 degrees for a start.Pour some WD40 into the thread and let it soak through over night. Quote Link to comment Share on other sites More sharing options...
CoppellStereo Posted February 11, 2006 Report Share Posted February 11, 2006 Use a blowtorch. Put a chain arround the sprocket and then bock the chain in a vice as Onzaboymark says. IMO you'll have to use some kind of lever to unscrew the sprocket. Managed to unscrew a crank chainring today, in adition to heating the bloody thing up, i had to use a 1.5m lever which alone weighed about 25 kg (for tractor pulling )Heat is the best way, it steel expands quicker than aluminium and guess your cog is cr-mo and the hub body is aluminium. But don't put it into hot water, get it up to say 500 degrees for a start.Pour some WD40 into the thread and let it soak through over night.hopefully you put grease on it before hand! if you cant do what that said, try and put a driveside crank (non-front freewheel) on your left side of your bottom bracket, and put your wheel in the opposite way, and hold you brakes really tight, and pedal hard, but gently at the same time, or if you are brave, try a pedal kick! haha, j/k Quote Link to comment Share on other sites More sharing options...
Greetings Posted February 11, 2006 Report Share Posted February 11, 2006 hopefully you put grease on it before hand!yep that's what i meant, i was just very tired Quote Link to comment Share on other sites More sharing options...
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