Shotpeening???

[buffly]

May be a silly question, but i just bought a crank and rods for my 325 that have been "shotpeened"??? Not sure about the spelling, but can anyone give me a clue as to what it means??? Ta muchly!!!

[Turbo-Brown]

Means they've had hard little balls of metal (shot) blasted at them to hammer out imperfections in the surface (peen).

Should make them more resistant to fatigue I believe

[bigkev]

yes it compresses the surface making the metal denser and removes any minute imperfections that might entually open up as a crack or potentially fatal flaws

[jaistanley]

As cracks in metal normally propogate from minute surface imperfections and cracks, this proccess shuld make your crank a lot less likely to snap/crack.

All balanced up too is it? Seems likely if the last owner went to the trouble of having it shot peened.

Nice one.

Jai

[dannosail]

Shot peening also increases the surface hardness of the metal without hardening the component all the way through and running the risk of making it brittle.

[buffly]

Thanks fellas, at least now i know what it means!!