Production of ultra-thin or thin sheet movement of the real difficulty is not in the structure, but in the more fundamental aspects of how the movement of each piece of plywood, one for each gear and each screw is made ​​thinner.

In the secondary modern high-tech equipment, if you want to just come out of these ultra-thin parts production, but also not impossible mission: To these parts, but the accuracy strictly controlled within a certain range, and they fit lossless together, it is quite a challenge. For example, in a ordinary mechanical movement, the gap between the shaft and the shaft eye gear will be around 0.23 mm, both to ensure the flexibility to rotate the gear, and without departing from the axis of the eye.

Then the ultra-thin movement, this gap might be reduced to 0.1 mm or even 0.05 mm, which means that in general the original mechanical movement is irrelevant poor accuracy, then it may affect the movement of normal operation. Therefore, the ultra-thin movement of part failure rate will be much higher than normal watch parts, this is an important reason for thin sheet production costs stubbornly high.