Use the small end of the double-sided key to make the adjustment Choose the suspension spring that is correct for your clock. Suspension spring length: Often, when a clock is repaired by a person who has limited knowledge of the effect a replacement spring will have on the running of a clock they will occasionally install an incorrect length or thickness of suspension spring. Having the correct weight pendulum for your clock ensures smooth running. The pendulum is the incorrect weight: If the pendulum is too heavy it causes the centre of gravity to be too low, consequently the clock will run slower. Parts of the clock related to the pendulum Anything that increases the length of the pendulum will reduce the rate of the pendulum and result in a clock that will run slower. Shortening the pendulum will speed up the clock. Use the small end of a double side key and insert it into the dial face of the clock to speed or slow down the clock. In the absence of an adjustment on the pendulum, there is a regulator on the clock face. Many pendulum clocks can be adjusted either by a set screw at the bottom of the pendulum or by an inset screw on the pendulum. Pendulum too low or too high: The lower the pendulum the slower the clock will run. One-weight wall clock with large pendulum bob and rate adjustment on the bottom Suspension spring not attached correctly.Let’s look at some factors and explain each one in this article That said, how many mechanical devices do you know run perfectly (relatively speaking) after 120 years.Ī clock runs slow for a variety of reasons. Weight-driven mechanical clocks that gain or lose several seconds per week are considered to be very accurate. In fact, a typical American spring-driven clock in properly serviced condition may gain or lose a couple of minutes per week as a norm. Contrast that with an era when folks were content to accept that their mechanical clock would be a minute fast or slow through the week and it was a common practice to make small adjustments over the run cycle of a clock. We are quite accustomed to the accuracy of quartz clocks which lose or gain mere milli-seconds per week. Mechanical clocks, whether they are antique or vintage are the focus of our discussion on why a clock runs slow. There are four general categories of clocks quartz, electro-mechanical, electric, and mechanical. Your situation may be unique and if it is not a clock issue covered by this article I suggest consulting an expert in clock repair
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