Visual Diagram of a Mechanical Watch Movement

 

 

 

1.  Train bridge	23.  Lower escape wheel pivot / cap jewel
2.  Third wheel	24.  Escapement inspection holes
3.  Upper third wheel pivot / hole jewel	25.  Lower pallet arbor pivot / hole jewel
4.  Set lever screw (detent screw)	26.  Lower balance pivot/ cap jewel
5.  Transmission wheel (Crown wheel)	27.  Click
6.  Ratchet wheel (Winding wheel)	28.  Click spring
7.  Barrel bridge	29.  Upper center wheel pivot / hole jewel
8.  Clutch wheel	30.  Center wheel
9.  Winding pinion	31.  Balance cock
10.  Set lever	32.  Regulator
11.  Stem	33.  Upper balance pivot / cap jewel
12.  Crown	34.  Escapement inspection notch
13.  Yoke spring	35.  Hairspring stud
14.  Setting lever spring ( set bridge )	36.  Balance wheel
15.  Yoke	37.  Pallet bridge
16.  Upper forth wheel pivot / hole jewel	38.  Hairspring
17.  Set wheel	39.  Upper pallet arbor pivot / hole jewel
18.  Lower barrel arbor pivot / hole	40.  Pallets
19.  Minute wheel	41.  Escape wheel
20.  Mainspring barrel	42.  Upper escape wheel pivot / cap jewel
21.  Center shaft and cannon pinion	43.  Forth wheel
22.  Lower forth wheel pivot / hole jewel	44.  Hour wheel

 

Illustrations by Denis Carignan  ©2001