Basic Structure of the Mechanical Watch Movement

Starting from the Basics, The Basic Structure of the Mechanical Watch Movement (A)

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Everything is inseparable from the foundation. I always think that the watch movement is the same. For example, Patek Philippe’s basic movement cal.324, based on the addition of various functional modules, has created various functions based on cal.324 or complex movements (such as Cal.324 S IRM QA LU, is the addition of the power reserve, perpetual calendar window date display and moon phase). Therefore, a basic movement is very important for a watchmaking brand, and a basic movement as thin as possible and small means that it can add more functions.

The basic movements of various models from various brands have different characteristics, but the basic structural principles are similar. The energy is stored in the spring by a winding or an automatic pendulum, and the energy is transmitted to the oscillating system through the escapement for a long working period. At the same time, the oscillating system is released to the constant velocity movement of the escapement and transmitted to the pointer mechanism to indicate the time.

Recently, I got a few of the watches with the calendar display function equipped with the automatic original movement, the movement reference is not mentioned, let us have a glimpse.

Tool Chapters:


Let’s first talk about the disassembly tool. First, you need a special magnifying glass. Since the parts of the watch are exquisite, so the purpose of the magnifier is to make each parts be visible to prevent damage during disassembly and assembly. It is usually necessary to prepare 3 to 12 times a magnifying glass of different magnifications, but this time I only disassembled the parts, so a low multiple prepared is enough.

Movement Fixed Base

The fixed seat is to fix movement, making it easy to disassemble. You need to lock gently, don’t use too much force to avoid hurting the board.

Special Screwdriver

The whole set of special screwdrivers will be available on the work table of each watchmaker. There are different combinations of 10, 9 and bulk. You can replace the blade by loosening the screw fixing hole on the screwdriver. Each knife has a color to distinguish the specifications, and the outer circle number represents the diameter of the knife. Use the size of the screw first and select the appropriate size, so as not to damage the screw cap or accidentally slip the hand to scratch the board.

Antimagnetic Tweezer

The tamper-resistant tweezers are also necessary. When the parts are gripped, the parts are protected from magnetism. Usually 2 to 3 pieces are enough. Thicker tips are usually used to pick up general parts such as movements, splints, screws, gears, etc. Small parts are usually used with thinner tips. Do not use too much force. When picking up parts, do not pinch the plane. It is best to find the appropriate place to pick it in a vertical way to prevent the parts from being scratched by improper force.

I got a separate movement this time, and there is no hands. Therefore, there are fewer steps in disassembly, no need to open the bottom cover, and there is no need to pull the pointer. But let’s introduce it here.

Universal Watch Opener

Watch Hands Puller

The opener can be used to open the screw-in bottom cover, adjust the opener to the appropriate size of the watch, press it and rotate it to the left to open the back cover. It is better to use it with the watch fixed base. The hand puller is used to remove the pointer, and there are also unused hand pullers depending on the model.