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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…


Pawl Modifcation

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Steve
Steve
2 hours ago

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.

SP05B pendulum axle

Just building my second clock, completed large moon phase, and building small pendulum (SP05B), and noticed in the instructions on page 45, you indicate to use 3” 3mm rod for pallet assembly, that should be 3 1/2” rod surely, also says 323 bearing instead of 623 bearings

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Steve
Steve
2 days ago

Yes, the pallet should use a 3.5" arbor and the only bearing size used is 623.


Thanks for catching these typos. I will update my copy and release it at the next convenient time.

Slava Kuznetsov
Slava Kuznetsov

the clock that started it all :)

https://youtube.com/shorts/4t3aFzj1e_Y?si=Pu5MQCqIPKNU-G2a This one was actuallly printed last year; didnt have time to hang it

Color schemes copyrights belong to my daughers, it was a teamwork :)


Happy New Year!

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Hi Steve, I am just starting to assemble my SP14 clock. I ordered the parts on Etsy (Thank you!)


When I got to page 22 in the assembly guide it mentions a 75mm arbor in the 3mm section but the package from etsy does not contain it, it does look like there is an extra 75mm piano wire size is that what should be used instead. This might become clearer later but wanted to ask :) Thanks! Herbert

85 Views
Steve
Steve
Dec 30, 2025

Hi Herbert,


Sorry for the missing part. Another builder also found the same missing part recently. Many kits in my inventory were also missing the 3mm x 3" arbor. I sent replacement parts to all purchasers back to November 1st, but it looks like I need to go back to at least the middle of October. A replacement part will be sent out with tomorrow's mail.


Steve

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