But how to choose a satisfactory quality watch? Often, people only to listen to the size of the table walking machine voice, high and low to judge the quality of the watch, it is unscientific. Because watches quality, basically be to see it the accuracy of the actual travel time. Table machine as the sound of a balanced, clear and no noise, just means no fault in the machine table, doesn't mean the watch quality is good or bad, as a way to choose a watch.
Also must choose from the following points:
A watch, check watch appearance parts appearance from shell and at the second hand, table mirror, dial, etc. Case should be without sand holes and obvious scratch, angular symmetry; On the back cover and spiral shell part should be closely; Distance apart is exactly equal to the length of each with two table ring watchcase, install the ear Juan hole should be centered in position at the end of the casing feet unbiased, the depth of the hole, the appropriate table ring is not easy to fall off; Table mirror should be without defects and scratches, transparent and bright; Installed correctly, three needle and needle, table mirror and shall have the right security clearance between dial; Dial and hands coating finish good, no spot mark, dial scale lines or luminous point complete; Between head and case about 0.1 0.3 mm gap.
Second, check the sensitivity of watches watches sensitivity refers to the balance wheel it automatically the flexibility of the pendulum. The inspection method is:
1) will not be a wind-up watch has stopped walking gently shaking, with the power of shaking to watch the second hand move: if the second hand stops walking around in a very short time, explain this watch on foot wound after all through no moment (spring), high sensitivity; If the second hand still waiting for a long time, explain this watch on foot wound after can't all go out (that is, the spring also stored torque), the sensitivity is not high or malfunction with the machine table.
2) will not be a wind-up watch stopped walking, turning his head slowly, watch the second hand starting conditions: article on the rotation is less, the second hand starting the earlier that the higher the sensitivity of the table; Low sensitivity or conversely table machine has other malfunction. But should pay attention to quickly put the watch because of the balance spring stiffness is bigger, than the traditional frequency (18000 times/h) table confidential on a little more spring to the pendulum. High sensitivity of watches, foot a wind-up continue after walking for a long time.
3) check watch pointer spacing and location
Between the clock and table mirror, dial and should keep a certain distance between three stitches, or scratches and influence each other table machine run properly. Check when can observe through the dial needle. The location of the hour and the minute hand and cooperate with each other whether normal inspection method is: will the minute hand and hour hand to 3 points, 9 points, observe whether two right angles; Whether to six points, two needles in a straight line; Whether to 12 o 'clock, two needles.
Article four, check a watch on the institutions
Normal watches should be relaxed. Article turn his head, first feel loose, gradually, more and more tightly when cannot continue to turn his head forward, article description on spring has completely full and work normally. If the rotation handle head article, "the abnormal sound of trees, or produce the phenomenon such as top tooth slippage, the article description on the institutions have fault.
5)check the watch dial needle
Watch the needle should be flexible, reliable, and pointer uniform rotation. Check the check points should be paid when wheel and the center shaft friction with firmness.
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