How to tell if a main shaft is bent or not

[Md001]

dear fellow members,

another mechanical question I have for you all and hope someone would be able to answer my question....

Is there any way or trick to spot a bent main shaft......????

I have 3 main shafts with me atm and not really sure if they are bent or not .... all 3 turns in similar round circle (when viewed from the top).....all 3 main shafts went under some medium hammering since it was stuck in the one way shaft.

Some advice would be really appreciated..

regards.
md

[panosg]

Roll it on a flat piece of glass and see if it rolls true.

[chucky21022010]

Best trick I learned is to roll it on a glass or a flat surface.

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[Boggy]

Roll them on a known flat surface.

eg a sheet of glass.








mssg to the smartA%%$ yep I know glass is sometimes not perfect!

[Boggy]

LOL where did you two come from there were no replies when i started typing!

[Md001]

Umm can you please explain how perfect one is going to roll compared to a bent one.....as I am not sure what perfect roll is suppose to look like :S

Roll it on a flat piece of glass and see if it rolls true.

[chucky21022010]

While rolling it, observe closely one end. If it is bent it will move up and down.

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[Md001]

guys you need to explain how a bent one is going to roll compared to a good one!

[Sesame]

ones thats bent youll have to keep pushing a straight one will roll you can also hear it, if its bent the sound changes where a straight shaft makes a constant rolling sound.

Geez explaining a sound is not easy. hope it makes sense lol

[Boggy]

If its really bad it won't roll Just try it and you'll find its pretty obvious if its bent.

[Boggy]

ones thats bent youll have to keep pushing a straight one will roll you can also hear it, if its bent the sound changes where a straight shaft makes a constant rolling sound.

Geez explaining a sound is not easy. hope it makes sense lol

Its like "Glompiter Glompiter" kinda noise. (one for the Jack Lemon fans ) :-)

[electricsceadu]

the other more expensive option is to use a pair of V blocks and a dial test indicator
but the simple way is to roll it on a sheet of glass (or known flat surface)
when rolling watch the shaft if the one end or middle lifts then its bent
if rolling on a dark surface watch to see if any light appears under the shaft when rolling it, if it does its bent

[David Drew]

Roll it on a dusky maiden's thigh. Might take your mind off a bent shaft.

[pgkevet]

Its like "Glompiter Glompiter" kinda noise. (one for the Jack Lemon fans ) :-)

Brill movie!

Another way is to stick it in a leccy drill chuck and spin it..any blurring along the edge means bent.
Yet another way would be an arrow straighner.. basically instead of v blocks it's 2 pairs bearings and againa dial test indicator

[Md001]

Sorry mate...hard to observe one end very slight movement so really hard to tell..plus I wear glasses makes it even harder!!!!!!!!!

While rolling it, observe closely one end. If it is bent it will move up and down.

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