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Syed117 · 4 October 2015, 12:27 AM

Is there a direct relationship between the rotor revolving and the turning of the crown?

Obviously the turning of the crown doesn't make the rotor swing around, so I was wondering if there is anything relating the two.

Does one full 360 degree turn of the crown provide equivalent mainspring charge as a full 360 rotation of the rotor?

J!m · 4 October 2015, 01:36 AM

The rotor is geared down quite a bit to make it easy for the low weight to have enough torque against the spring.

Think about the resistance on the crown when winding compared to what it takes to get the rotor spinning.

I don't know (or care) what the actual ratio is between them.

dom_ · 4 October 2015, 03:28 AM

As said the rotor is heavily geared, think about one full rotation of the rotor is usually a tooth or two on the ratchet wheel. The clicks you hear when winding the watch are the teeth or the ratchet wheel passing the click, hence the name. The click stops the ratchet wheel unwinding.

When you wind the crown you are right the rotor won't spin, but if the reversers failed it could and it is a more common fault on ETA 2824's, I don't think I have ever seen it on a Rolex.

4 October 2015, 12:27 AM	#1
Syed117 "TRF" Member Join Date: Oct 2012 Real Name: Syed Location: The Ether Posts: 3,388	Rotor revolution to crown winding Is there a direct relationship between the rotor revolving and the turning of the crown? Obviously the turning of the crown doesn't make the rotor swing around, so I was wondering if there is anything relating the two. Does one full 360 degree turn of the crown provide equivalent mainspring charge as a full 360 rotation of the rotor? __________________ Rolex Datejust 41 126334 \| Omega Speedmaster Professional Hesalite \| Cartier Santos Large \| Tudor Black Bay 58

4 October 2015, 01:36 AM	#2
J!m "TRF" Member Join Date: Sep 2014 Real Name: Jim Location: Connecticut Watch: this! Hold my beer Posts: 2,828	The rotor is geared down quite a bit to make it easy for the low weight to have enough torque against the spring. Think about the resistance on the crown when winding compared to what it takes to get the rotor spinning. I don't know (or care) what the actual ratio is between them.

4 October 2015, 03:28 AM	#3
dom_ "TRF" Member Join Date: Jan 2012 Location: England Posts: 134	As said the rotor is heavily geared, think about one full rotation of the rotor is usually a tooth or two on the ratchet wheel. The clicks you hear when winding the watch are the teeth or the ratchet wheel passing the click, hence the name. The click stops the ratchet wheel unwinding. When you wind the crown you are right the rotor won't spin, but if the reversers failed it could and it is a more common fault on ETA 2824's, I don't think I have ever seen it on a Rolex.

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