Tech engineer question

[Gary72]

I should probably just ask Peterj but would get confused by the answer
Why is it that when you tighten some bolts ie stem bolts that they make that creaking/screeching sound?
Is it friction between bolt and stem? The metal stretching? Am I just been to heavy handed?
Doesn't seem to do it with all bolts, I've heard it from stem, seat clamps etc.

[pickle]

Could be the types of metal, ie: steal nuts on alloy stems and clamps?

[kungfunky]

Screeching sound ?......Friction ?..... Stretching ?.....Yup Peter J's you man for this  

[CD17]

It will be friction between the stem wedge & the inside of the forks as you tighten 

[superbikedan]

add grease

[rooski]

Its because theres no lubricant between the 2 parts,they are binding on each other,get some copper slip or grease on the threads and under the bolt head

Long bolts are worse as they twist slightly under load, then slip,causing the squeaking noise,some times you even get a spark

[popedante]

 fook all to do with the bolts , probably your wrist creaking   

[brummie]

overtightening 
the bars crimping 
the seatclamp hairline fracturing 

 

[Peter J]

Not Friction as this is a different force, friction is caused when two surfaces are "pulled" across each other

I think you are describing stiction the frictional force to be overcome to set one object in motion when it is in contact with another

Basically you apply force to one part and at a particular point the (kinetic) energy stored in the material “gives” and moves rather than dispersing the energy into heat (friction) to creek you hear is the energy changing into sound (stiction).

Stiction is within the group of forces under the friction family.

A good example of stiction is when you tighten the wheel nuts up on your car and you get that creek as you finish tightening them up.

I can also give a long winded answer  

[dan-dare]

 

[superbikedan]

Not Friction as this is a different force, friction is caused when two surfaces are "pulled" across each other

I think you are describing stiction the frictional force to be overcome to set one object in motion when it is in contact with another

Basically you apply force to one part and at a particular point the (kinetic) energy stored in the material “gives” and moves rather than dispersing the energy into heat (friction) to creek you hear is the energy changing into sound (stiction).

Stiction is within the group of forces under the friction family.

A good example of stiction is when you tighten the wheel nuts up on your car and you get that creek as you finish tightening them up.

I can also give a long winded answer  

so is the answer,  add grease

[Peter J]

so is the answer,  add grease

 

 

[QUADROPHENIA]

Spit on it

[Gary72]

Thanks, Car wheel nut sound is the one

[monkian]

Not Friction as this is a different force, friction is caused when two surfaces are "pulled" across each other

I think you are describing stiction the frictional force to be overcome to set one object in motion when it is in contact with another

Basically you apply force to one part and at a particular point the (kinetic) energy stored in the material “gives” and moves rather than dispersing the energy into heat (friction) to creek you hear is the energy changing into sound (stiction).

Stiction is within the group of forces under the friction family.

A good example of stiction is when you tighten the wheel nuts up on your car and you get that creek as you finish tightening them up.

I can also give a long winded answer  

I'm so hot for you right now

[Peter J]

Do I make you moist 

 

[monkian]

Ooooo Can I ping your braces?

[Peter J]

 

 

[Gary72]

Typical Rad thread, No more than 15 replies and it drops to gutter level