What is the meaning of the mechanical watch drilling number?

Drill the number and frequency of mechanical watches: steel and semi-steel: steel, semi-steel is the watch case material. All steel is the watchcase and watchcase are made of stainless steel, while the semi-steel watch case is chrome steel, the back cover is stainless steel. The number of diamonds on the watch, the number of diamonds and the frequency engraved on the watch on most dials, and the number of diamonds are one of the symbols that measure the quality of the watch. The number of diamonds is the number of stones in the watch. Ordinary watches require 17 drill ~ 19 drill, automatic table requires 25 drill ~ 30 drill, drilling is not the higher the better, non-working parts table drill performance and quality of the table has little effect, but played a decorative role. In the general 17 diamond table, 17 gems are functional drill, the reasonable distribution of: 5 vibration system, escapement 6, 6 wheel drive, watch the higher the frequency the better. Frequency refers to the number of times the balance wheel swings every hour, the frequency of 18,000 times the following low-frequency table (slow swing table), more than 21,600 for the high-frequency table (fast swing table). The higher the frequency of the watch, the more accurate the travel time.