On Paper – Making a Map
Before I could take the movement entirely apart, it had to be drawn so I would be able to put it together again with the gears in their proper places. To do this, I drew circles and numbered them in a hierarchy to display the order in which they went, then drew each individual gear to show “which way was up”. Since there are two plates, it is very easy to put a gear’s opposite end in the wrong hole, so not only did I have to know their order, but also the relationship of their pinions to wheels, which end went “down”, and the characteristics of each individual gear. The difference between pinions and gears should be explained. A wheel is, of course, a toothed disk that drives other gears. A pinion is a smaller portion of the gear, either in the shape of a lantern or a cut, smaller wheel that mates with the wheel of an adjacent gear. The pinion is the driven and the wheel is the driver. Another difference is that pinions have fewer “teeth” than a wheel, but they’re called
“leaves” instead. In fact, if a wheel has less than 20 teeth, it is considered a pinion, and the teeth are then called leaves. Both a wheel
and a pinion together on a steel shaft is representative of a gear. At any rate, I had to know where the wheels and pinions were positioned on each gear, and where each gear was positioned between the plates. In
addition to drawing the movement, I also examined it for any damage I hadn’t already noticed. One thing that made itself apparent was
Bent Hand Nut the warped condition of the hand nut. Placing it in a hole on an otherwise flat block, I pounded it gently flat with a brass hammer so as not to mar the
surface. Thus, I | straightened the hand nut. |
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