unscrewing fastener - "click" sound
unscrewing fastener - "click" sound
(OP)
Hi all,
is my thesis appropriate regarding this sound in your opinion?
if you are trying to unscrew a screw with a tool there is always a characteristic "click" sound. After that, you can do it with bare hands.
What is the reason of this sound? Does thread is deformated a little bit while it is tightened and after it is released to normal position this sound appears?
awaiting your opinions
is my thesis appropriate regarding this sound in your opinion?
if you are trying to unscrew a screw with a tool there is always a characteristic "click" sound. After that, you can do it with bare hands.
What is the reason of this sound? Does thread is deformated a little bit while it is tightened and after it is released to normal position this sound appears?
awaiting your opinions





RE: unscrewing fastener - "click" sound
In the clip you linked, I'd say the sound is due to the elastic deformation coming from the stress in the bolt. This deformation makes the male and female threads come into close contact, and having thus a high coefficient of friction. When you undo the bolt, you must first overcome this friction, and that makes that sound.
that's just my $.02
RE: unscrewing fastener - "click" sound
I cannot view your video here at work.
Is it possible your screw was retained with thread-locker? These tend to make a clicking or popping sound when un-tightened.
--
JHG
RE: unscrewing fastener - "click" sound
RE: unscrewing fastener - "click" sound
I attribute the cause to extreme values of stick-slip ie stiction.
To quantify that I'd put a thin smear of anti-seize on the surface the fastener head seats against and repeat the un-screwing experiment.
Then the screw threads
As to the sound creation part, I think the large exposed wrench or screwdriver surfaces and the driver/fastener interfaces might bear a look.
For instance a large flywheel wrench, a wrench with plastic lined jaws or a brass wrench might change the resulting click.