Quote:
Originally Posted by JohnnyBravo
It will get that hot?.....
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Quote:
Originally Posted by old3
.........."Yes, it is a quick way to fillet-weld break-test any frame." I think he means the clunking will transmit enough force to stress the weaker parts of the frame..........
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Precisely !!!
Thanks old3 and sorry JohnnyBravo for my poor English.
Yes, any sustained persistent hammering, especially the one coming from a loose head column-stem, leads to cracks in the welded joints of any frame, which are the weakest links (more fragile molecular structure than the steel of the frame).
"Metal fatigue is the progressive and localized structural damage that occurs when a material is subjected to cyclic loadings."
http://en.wikipedia.org/wiki/Metal_fatigue
That is one of the the reasons for panels of airplanes's skin to be joined by rivets and for our bikes to have suspension and pneumatic tires.
Leave alone the torture for those tracks and little balls in the bearings.
If you want to keep the ball bearings, you must maintain the play of the head column-stem well and frequently adjusted.