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How the heck does a slipping spring work??

4.6K views 5 replies 3 participants last post by  thelinearmass  
#1 ·
To many, this might be super easy to understand but after doing quite some research, I still don't understand how the bridle at the end of the mainspring prevents the spring from slipping when it's not fully wound.

I read that it puts force on the outer coil to create friction between the wall and the spring. I also read there are notches that can grab the outer coil so it doesn't slip further. Lastly, there seems to be some grease creating even more friction.

However, what I don't understand is that if the bridle is attached to the outer end of the mainspring, then how is it putting force on the outer coil if it itself is attached to it? When I try to visualize it, I see the spring being wound and perhaps one of those notches catching the bridle so the barrel wall has some grip on the outer coil but this doesn't line up with the following image:



Maybe I'm lacking the visual and technical insight to understand it or I'm simply over-complicating it but if you have some answers for me where you can explain it like I'm a five year old, that would be great!!
 
#4 ·
The bridle is much thicker that the mainspring.

The bridle is compressed within the first wrap of the mainspring and the smaller radius of the barrel and its more substantial spring force is what pressures that first wrap against the barrel wall.

Grease reduces the coefficients of friction preventing excessive amplitude and damage to the autowind mechanism.
 

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#5 ·
You must know some pretty smart 5-year olds!lol That went over my head, but then again I'm like Jon Snow when it comes to certain things..