How to Determine the Correct Clock Motor Shaft

The Correct Clock Motor Shaft is a Measurement that will determine the success of Your Clock Project
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On a quartz movement there are three sections of the hand shaft. The first and lowest is that threaded section. That's where an hex nut goes on to hold the movement in place.

The next section is going to be the hour hand shaft and that's where the hour hand presses on and the next is the minute hand shaft.

If you look real closely you'll see that the minute hand shaft actually has two little flat sides on it. And that's so you can align the hand properly and then one of these little nuts goes on the top to hold it in place.

For the second hand shaft you have to look very very closely it's right
inside the minute hand shaft. So we really have four concentric shafts on a clock movement.

The threaded shaft, the hour hand shaft, minute hand shaft and the second hand shaft. Actually there's only two measurements that are important.

The threaded shaft length is very important because that's what defines how thick of material you can go through and that's why we have six different shaft lengths. Each one about it an 1/8 of an inch larger than the other.

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So that regardless of what material you're going through there is gonna be a shaft available for it. The other important measure is the entire length of the shaft called the overall length where you measure
from the top of the shaft all the way to the bottom of the threading.

The overall shaft length is important because if you have any type of glass lens cover lens on your clock you want to make sure that
you're not putting a shaft in that's so long that it's going to actually hit the top of the lens in some way or have a minute or second hand hit and rub.

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