A falling weight provides power to the minute hand which in turn pushes the pendulum. The final component of the gear train is the weights. This gives a balanced look but loses the ability to add a second hand. Three sets of gears with 54:12 ratios drive a 30 tooth escapement and a 17" pendulum with 5467.5 beats per hour. A traditional clock design with 60:8 and 64:8 gear ratios would need a 39" pendulum rod which seemed too long for this design, so I changed the gear ratios to allow for a shorter pendulum. This clock uses a deadbeat escapement designed in Gearotic. The constant rate is what helps the clock keep accurate time. I used a traditional Roman numeral dial for this clock.Ī pendulum swings at a constant rate depending on its length. The basic requirement is that the minute hand should rotate once per hour and the hour hand should rotate once per 12 hours. ![]() Most pendulum clocks share the same basic structure with slight differences in the gear ratios. The next step was to design the overall gear train. I printed the gears in gold colored filament to get them to look like brass. Smaller pitches were possible, but some of the teeth were slightly distorted. A 20 DP gear with 60 teeth will be 3" in diameter. I printed an assortment of gear sizes ranging from 10 dot pitch down to 40 DP and selected 20 DP as my favorite. They needed to be large enough to print accurately, but not so large to exceed the capabilities of my printer. One of the first experiments was to determine a good gear tooth size. Involute gear profiles were designed using Gearotic and imported into TurboCAD for final adjustments. I started with a basic sketch of the clock, then fit the gears so they would be relatively symmetrical. Designing this clock has been a spare time hobby of mine for the past 6-8 months. The challenge is to make everything work elegantly and accurately. ![]() A series of gears convert the pendulum motion into a display for the hours and minutes. A spring or falling weight provides energy to a swinging pendulum that swings at a constant rate. We'll demonstrate how to use optiSLang with Workbench, Electronics Desktop, and other tools register today.A pendulum clock is conceptually very simple. The webinar addresses current DesignXplorer users and customers interested in design exploration, optimization, or robust design.
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