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Printed Clocks

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SP7 Perfection :-)

Well after 3 months of running the SP7 with the changes that I made I can now say it runs perfect. One of my main goals was to get that damn second hand from jerking back and forth when it ticked. After much trial and error I solved the problem by making new pawls but still using the original rachet gear that Steve created.

It was a matter of weight. The pawls I last had used a small magnet which only weighted 0.92g... not enough to stop the rachet dead each tooth or click. The pawl I created uses 14.75g (A lot more weight). I first did it with 5 pennies with a printed cap over them but really wanted something smaller. I found 15mm brass discs that did the trick and looked much better on the pawl. I also put a small piece of felt on the pawl. The clock now is almost completely slient running.


This of course is running the clock on the new pendulum driver I created. It has plenty of amplitude to keep the pendulum swing with that much weight on the pawl. The clock has not stopped once in the 3 months running. And only off in time by 7.5 seconds. The videos show how well the second hand works now and the other videos show the penny and brass weighted lower pawl with the printed cap to hide everything.


Pawl Modifcation

Stack of 5 pennies with a cap

Brass discs capped and much smaller then pennies. Also imbedded the cap down into the pawl.


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Steve
Steve
10 de jan.

Looks good. I always had trouble losing pendulum amplitude if there was any extra friction in the pawls. The extra voltage is certainly needed. When I get around to updating this clock, I will design it for either 4 batteries or 5V USB power.

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