The drop is the length of the pendulum from the hand shaft all the way down to the bottom of the pendulum rating nut threads. The American mechanical clock movement manufacturers referred to the pendulum length as a "drop". The manual and the sticker on the case is of no use to get the pendulum. It has to come right off the back of the clockworks. This is the only way, and we can't cheat by looking at the paperwork or clock case. The first thing we need to do is get the numbers off of the back plate of the movement. German grandfather movementsĪlmost all grandfather clock movements are going to be German if made after 1950. In this example, the pendulum length would be 80cm, representing the full length with the size of the bob factored in. Now it is possible to go to the Urgos page and find the number to see what the pendulum length is. In this example, we see that it is a Urgos. Go to the identification page to look at the movement number examples. Generally speaking, let's say that the movement has no CM stamp on the movement and only shows the Urgos number UW32319. The unit will have a number that would need to be found on this website first to find out what the correct CM length is for it. Moreover, some movements do not have an indication of the pendulum length on the back plate. Various clock retailers may have have their name stamped onto it, but the numbers are always true to the manufacturer. The movement numbers indicate who actually manufactured the movement. The first step is to identify the manufacturer of the clock movement by using the movement numbers. The numbers on the back plate will cross reference to the pendulum length required. With no pendulum length stamped into the movement some added steps are involved. To clarify, CM stands for centimeter and PL stands for pendulum length. This length will include the pendulum itself, the leader that it hooks to, and the suspension spring on the top that the leader hooks on to, all in one CM measurement. If it is German, keep in mind the CM length is not the actual pendulum length.Īltogether, German units measure this length from the top of the clock movement, and this includes the three components of the pendulum all in one length, in centimeters. In essence, the numbers will let us know or the stamp will clearly state the CM or PL number. Most mechanical German made clock movements are easy to figure out the pendulum length. Mechanical Clock Pendulum Length for German made movements Generally, this is measured in a few different ways usually dependent on country of origin. Subsequently, this would be the length where it should keep approximate time. It may say CM or PL and this stands for centimeter or pendulum length. Likewise, there may be an indication of how long the pendulum should be in the mix of these numbers. On the back plate of the clock movement usually, there are some numbers and or letters for identification. This will cover most situations, without special equipment to figure out the length. Of course, this is a basic guide to narrow it down to the best pendulum for the clock. If there is no idea what pendulum it would take, this is a basic guide. Hence, getting the mechanical clock pendulum length correct does take some diving into the clock world.
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