31 Jewels

[BigHat]

Originally Posted by elijahenoch

JEWELS ? what are jewels Are they actual jewels?

Is this a serious question? If so, yes they are jewel bearings to minimize friction. Synthetic rubies in most cases.

From Wiki:
The advantages of jewel bearings include high accuracy, very small size and weight, low and predictable friction including good temperature stability, ability to operate without lubrication and in corrosive environments. They are known for their low static friction and highly consistent dynamic friction.[1] The static coefficient of friction of brass-on-steel is 0.35, while that of sapphire-on-steel is 0.1-0.15.[1][2] Sapphire surfaces are very hard and durable, with Mohs hardness of 9 and Knoop hardness of 2000, and can maintain smoothness over decades of use, thus reducing friction variability.[1] Disadvantages include brittleness and fragility, limited availability/applicability in medium and large bearing sizes and capacities, and friction variations if the load is not axial.

[elijahenoch]

Originally Posted by BigHat

Is this a serious question? If so, yes they are jewel bearings to minimize friction. Synthetic rubies in most cases.

From Wiki:
The advantages of jewel bearings include high accuracy, very small size and weight, low and predictable friction including good temperature stability, ability to operate without lubrication and in corrosive environments. They are known for their low static friction and highly consistent dynamic friction.[1] The static coefficient of friction of brass-on-steel is 0.35, while that of sapphire-on-steel is 0.1-0.15.[1][2] Sapphire surfaces are very hard and durable, with Mohs hardness of 9 and Knoop hardness of 2000, and can maintain smoothness over decades of use, thus reducing friction variability.[1] Disadvantages include brittleness and fragility, limited availability/applicability in medium and large bearing sizes and capacities, and friction variations if the load is not axial.

I know a Jessica Simpson Question, but yeah serious question that has been on my mind for a while ! Thanks for the answer

maybe somebody
can post a few pictures of the actual jewels .

[BigHat]

Originally Posted by elijahenoch

I know a Jessica Simpson Question, but yeah serious question that has been on my mind for a while ! Thanks for the answer

maybe somebody
can post a few pictures of the actual jewels .

No problem. You just never know when a leg is being pulled around here. Now you know. All those "ruby" red bearing points on these Lange and Panerai movements. Jocke certainly has better pics.

[elijahenoch]

Originally Posted by BigHat

No problem. You just never know when a leg is being pulled around here. Now you know. All those "ruby" red bearing points on these Lange and Panerai movements.

Thanks for the knowledge BIGHAT.