Girard-Perregaux Gyromatic operation

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Girard-Perregaux Gyromatic operation

New postby Thawkins » Fri Jan 11, 2013 2:35 am

I have a GP gyromatic wristwatch from the late '70s that belonged to my dad. It is in good shape, looks nice and is a good time keeper. I don't understand the "gyromatic" designation. Is this supposed to be a self-winding mechanism? Or exactly what does the term mean?

Thanks,

Tom
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Re: Girard-Perregaux Gyromatic operation

New postby watchguy » Fri Jan 11, 2013 11:45 am

Gyromatic is just G-P's term for a self-winding watch.
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Re: Girard-Perregaux Gyromatic operation

New postby Thawkins » Fri Jan 11, 2013 1:36 pm

OK, if I twirl the watch around, should I hear a whirring sound of a rotor? All I hear is a clunking sound.
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Re: Girard-Perregaux Gyromatic operation

New postby watchguy » Fri Jan 11, 2013 4:40 pm

It may be equipped with what is known as a bumper movement. It's selfwinding, but instead of a rotor that swivels a full 360 degrees, it can move less than 360 and has bumper like stops at the extremes.

But, I'm pretty sure that all the Gyromatics were full rotor movements, so perhaps yours has an issue. Can you open the case back?
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Re: Girard-Perregaux Gyromatic operation

New postby Thawkins » Fri Jan 11, 2013 8:05 pm

Looks like the back snaps into place. My tools are more in line with removing the heads from a big block chevy so I am not going to risk scratches and damage to an otherwise nice watch. What exactly is a bumper movement?
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Re: Girard-Perregaux Gyromatic operation

New postby watchguy » Sat Jan 12, 2013 12:36 am

Here is a bumper
bumpera.JPG



and here is a full rotor.
rotor automatic.jpg
rotor automatic.jpg (9.23 KiB) Viewed 2003 times


As you can see, the bumper has bumpers that restrict the movement of the rotor so that it can't turn 360 degrees, while the full rotor can rotate a full 360 degrees.
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