Could vibration damage a chromaloy frame

[adrian_d]

Hey all,
In my attempts to get the crank off the bike (it was literally fused on) I tried to cut the crank off with a jigsaw(since i was replacing the bottom bracket) It wasn't the best idea to do that, but I managed to get it off, I was wondering if the vibration of the jigsaw could have weakened the welds on the frame?

[Nobody]

Unlikely. You stomping on the pedals while standing would probably give more force than the jigsaw can produce.

[ldrcycles]

Not a chance, the frame would see far more vibration/energy put through it on a rough road. Not 2 months ago i had to cut a crank arm off a BB, the previous owner had completely stripped the extractor threads, very careful use of an angle grinder did the trick (maybe a dremel would have been better but i haven't got a dremel).

[adrian_d]

Thanks for the heads up

I was worried somewhat after all my hard work that I had stuffed up.

Would you believe i grabbed 2 flat screwdrivers inbetween crank and bottom bracket, a few gentle taps were enough to wedge the crank off. I should have done that first off.

[rkelsen]

Bush mechanic tip: Loosen the bolts and go for a ride.

[Mulger bill]

Bush mechanic tip: Loosen the bolts and go for a ride.

This, used it before. First time inadvertent after not putting enough grunt into the tool when re installing.

[ldrcycles]

First time it happened to me was when i borrowed the crank bolts for another bike and forgot to replace them, next time i rode it i only got about 2k .