![]() The primary positions for a pocket watch are stem-up, face-up, stem right, and left. An un-adjusted watch should run at a reasonably constant rate in two to four positions. The three critical adjustments are for position, temperature (the ability to keep good time over a range of different temperatures), and isochronism (the ability to keep an even rate over the life of one spring wind, typically 24 hours). Howard Pocket Watch Threaded Wheel micrometer regulator Adjusting a WatchĪdjusting a watch involves procedures that include ensuring the balance wheel is ‘balanced’ (poised), reshaping the hairspring, shaping the balance pivots, and changing how the hairspring is attached to the balance wheel. Common Regulator Hamilton 987A Micrometer Regulator E. If in doubt seek out a professional, or contact me. While pocket watches are relatively easy to open, wristwatches are usually much more difficult, requiring special tools. Of course this involves opening the watch to gain access to the movement inside. If your watch’s rate is varying more than this per day it likely will need repair or service. The regulator is usually only capable of changing the rate +/- 5 min per day. If in doubt, let an expert adjust the regulator (see images below of regulators on common pocket watches). These are a bit more difficult to adjust, as the screw can be tight, and the small screwdriver can easily slip. Higher grade watches utilize a micrometer regulator and afford more fine control via a small screw. Then let the watch run for a few days to see how much the rate was affected. A slight nudge toward the F (or fast) will speed the watch up, and toward S (or slow) will slow it down. If your watch is not keeping precise time, you can (depending on the type of watch) adjust the regulator yourself. In the shop, a watchmaker uses a timing machine to adjust the rate quickly. Thus, the correct setting for the regulator will be slightly different for each owner, depending on how the watch is worn or carried (this is sometimes referred to as personal error). The task of regulation is to modify it so that the average running rate is close to a zero error between the most common positions. ![]() A watch may run at different rates in different positions. ![]() Regulating is moving the regulator pointer to fast or slow adjusting the rate.
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