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Lesson 7 -- How
To Disassemble a Watch Movement
7 Jan 2007
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| 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. |
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| Tools Required:
Movement Holder, Eye Loupe, Screw Drivers, Tweezers, small boxes |
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This is a simple China Made Hand-Winding movement with the
center second hand.
No day, date display or other function.
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Step 1.
Clip the movement on the movement holder.
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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.
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The main spring is unlocked in the image.
Parts in green circle
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Step 3.
Unscrew the screw in green circle.
Pick out the Balance Cock and the Balance Wheel together
--- connected by the Balance Spring.
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Step 4.
Unscrew the screw in green circle.
Pick out the Pallet Lever Bridge and the Pallet Fork(green
arrow) separately.
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Step 5.
Unscrew the screws according to the directions.
Be careful, there is a ring sits under the Crown Wheel (Left).
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Step 6.
Unscrew and remove the Barrel Bridge.
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Step 7.
Remove the Mainspring Barrel (Green)
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Step 8.
Turn the movement over.
Pull out the Second Hand (Green)
by hand
Pull out the Hour Wheel (Red)
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Step 9.
Pull out the Cannon Pinion with some force.
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Step 10.
Unscrew and remove the Cover Plate.
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Step 11.
Remover the Minute Wheel (Big) and the Intermediate Wheel
(Small).
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Step 12.
Unscrew and remove the Cover Plate.
Be careful, there is a small spring under the plate.
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Step 13.
Remove the Clutch Lever and the "R" shape spring.
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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).
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Step 15.
Remove the Set Lever "Pushpin" (Green), the Crown
and stem, and other gears.
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Crown and stem
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| Left: |
Winding Pinion
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| Right: |
Clutch - Pay attention on the teeth
(Red and Green)
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Step 16.
Turn the movement over and remove the Wheel Bridge.
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Step 17.
Remove the 4th Wheel --- Second hand.
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Step 18.
Remove the 3rd Wheel.
Unscrew and remove the cover plate.
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Step 19.
Remove the Escape Wheel --- Silver color
Remove the Center Wheel (2nd Wheel) --- Gold color.
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Escape Wheel |
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Center Wheel |
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Only the Jewels left. |
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