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Lesson 7 -- How To Disassemble a Watch Movement
7 Jan 2007
 
After disassembled a clock and learnt the basic, this is a good time to disassemble a movement of a wrist watch. We used a simple China Made Hand-Winding movement as example. Although it is simple, it works and its the foundation of all complicated designs.
 
Tools Required: Movement Holder, Eye Loupe, Screw Drivers, Tweezers, small boxes
 
Hand Winding watch movement

This is a simple China Made Hand-Winding movement with the center second hand.

No day, date display or other function.

 
Hand Winding watch movement

Step 1.

Clip the movement on the movement holder.

 
Hand Winding watch movement

Step 2.

Release the power of the Main Spring.

Hold the Crown tight with one hand.

Another hand use a tweezer to turn the click's teeth(red dot) counter-clockwise in order to unlock the Ratchet Wheel which is connected to the Main Spring.

Release the Crown slowly and let it and the Main Spring to spin in order to release the Main Spring.

Hand Winding watch movement

The main spring is unlocked in the image.


Parts in green circle

 

     
Hand Winding watch movement

Step 3.

Unscrew the screw in green circle.

Pick out the Balance Cock and the Balance Wheel together --- connected by the Balance Spring.

Balance Cock and Balance Wheel

     
Hand Winding watch movement

Step 4.

Unscrew the screw in green circle.

Pick out the Pallet Lever Bridge and the Pallet Fork(green arrow) separately.

Pallet Lever and Pallet Fork

     
Hand Winding watch movement

Step 5.

Unscrew the screws according to the directions.

Crown Wheel
Be careful, there is a ring sits under the Crown Wheel (Left).

     
Hand Winding watch movement

Step 6.

Unscrew and remove the Barrel Bridge.

     
Hand Winding watch movement

Step 7.

Remove the Mainspring Barrel (Green)

Hand Winding watch movement

     
Hand Winding watch movement

Step 8.

Turn the movement over.

Pull out the Second Hand (Green) by hand

Pull out the Hour Wheel (Red)

Second Hand

     

Step 9.

Pull out the Cannon Pinion with some force.

Cannon Pinion

     
Hand Winding watch movement

Step 10.

Unscrew and remove the Cover Plate.

     
Hand Winding watch movement

Step 11.

Remover the Minute Wheel (Big) and the Intermediate Wheel (Small).

 

     
Hand Winding watch movement

Step 12.

Unscrew and remove the Cover Plate.

Be careful, there is a small spring under the plate.

     
Hand Winding watch movement

Step 13.

Remove the Clutch Lever and the "R" shape spring.

     
Hand Winding watch movement

Step 14.

Remove the Set Lever.

Be careful, there is a small part (Set Lever "Pushpin") under it.

Set Lever is used to prevent the Crown and stem to be pulled out of the movement. But you can push the Set Lever "Pushpin" and pull the Crown and stem out if needed (e.g. pick out the movement from the case).

     
Hand Winding watch movement

Step 15.

Remove the Set Lever "Pushpin" (Green), the Crown and stem, and other gears.

Crown and stem

Top:
Crown and stem
Left:
Winding Pinion
Right:
Clutch - Pay attention on the teeth (Red and Green)
     
Hand Winding watch movement

Step 16.

Turn the movement over and remove the Wheel Bridge.

     
Hand Winding watch movement

Step 17.

Remove the 4th Wheel --- Second hand.

     
Hand Winding watch movement

Step 18.

Remove the 3rd Wheel.

Unscrew and remove the cover plate.

     
Hand Winding watch movement

Step 19.

Remove the Escape Wheel --- Silver color

Remove the Center Wheel (2nd Wheel) --- Gold color.

Escape Wheel Escape Wheel   Center Wheel Center Wheel
     
Hand Winding watch movement Only the Jewels left.
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