The watch hours of needle poor coordination explain in detail

The watch minute hand coordination is poor, popular talk, that is allocated for the table, then the scale for the quasi-one hours time, the minute hand off "12" points offset level. The best situation is when the scale for the quasi-one hours time, the minute hand but also with "12" points coincide. However, this is often impossible.

Watch hours of needle poor coordination explain in detail

Poor coordination around the needle causes the following:

1, the surface of the disc word has fitters difference (usually inlaid or printed)

2, dial the sub-grid scale character in print error

3, the dial and the movement of the center hole of the hour, minute, second hand shaft hole do not coincide (plate claws and radial clearance exists between the movement)

4, when the minute hand assembly mounting error

About the watch, minute poor coordination, in the "mechanical watches" QB/T1249-2004 industry standard where this is required: At the time when the operator center coincides with the needle, the minute hand off 12:00 symbol centered perspective should be consistent with such requirements. 1, superior product --- 18 ~ 18 degrees (angle); 2, first-class products --- 24 to 24 degrees (angle); 3, Qualified --- 30 to 30 degrees (angle). Accounting up every 6 degrees a sub-grid, that is, up to around the needle poor coordination can not be more than five separate compartments. Around the needle assembly when mounting error is generated around the needle main reason for poor coordination. Hours, minutes, poor coordination of inspection methods in industry standard where this is required: the hour when the operator 3,6,9,12 respectively coincide with the center to check deviations 12:00 minute break point of the center shall meet the above requirements, this check belonging to the reliability of a used watch.

Watch hours of needle poor coordination

Interestingly, the previously performed "normal mechanical watches" QB/T1249-1991 industry standards, the minute hand is so provides poor coordination: When the operator 12 coincides with the minute hand, the clock is deviated angular displacement operator should less than 3 degrees. Accounting up around the needle up poor coordination not more than six separate compartments, it is clear now than before the implementation of the provisions of the standard strict. It is said that the early years are still planned economy, the watch industry and business people in the discussion of this standard when the very unity of mutual advice, business people can not accept a 6-minute difference in the coordination of a large needle, finally, changed when the points for quasi 12:00, while the hour hand deviated angular displacement operator should be less than 3 degrees. Like actual inside and outside in nothing more than a small digital display point only.

About midnight needle poor coordination problems arise, there is another reason, and that is the gear backlash problem in the clockwise and counterclockwise dial needle time, you can see the difference, there is always a point of orientation is relatively large in the other direction is relatively small dot. Imports wrist watch, ROLEX the minute hand is quite small poor coordination, including its calendar jump word error, gives a deep impression, the assembly and manufacture of precision and quality of a relationship. By the way, on the second hand on the bit, watches in the relevant standards are not defined. Because, from the watch and precision in terms of the structure, either quartz or mechanical watches, can not ensure its revolution of each position, the second hand is aligned with the scale.