My newly minted SP13 in shiny PLA Silk
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Printed Clocks
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SP4B will not stay running
Hello. I have assembled and tested all the gear assemblies per the instructions and still cannot get the clock to run. I have increases the weight to probably close to 20 lbs and the only way the pendlum will continue to stay running is if I apply pressure to gear 7 to create more force. The pendulum free swing test went for about 10 minutes so that seems okay. Where and why do I seem to have so much friction loss. All the gear assemblies spin freely on the shafts. Any help would be greatly appreciated.
Tim Jones
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Steve
20 ene
10 minutes on the free swing test is good enough for the pendulum bearings. There must be too much friction in the gears somewhere. SP4B has a few double stacked gears and the escapement arbor also needs to spin freely in the frame.
The next thing to check is the characteristics of the escapement. Does it spin quickly each time the pallet teeth clear the escapement? This is the only way that energy can be given to the pendulum.
Also, slowly move the pendulum back and forth after the clock stops and describe the characteristics.
btw: what runtime option are you using?
Need help with pendulum assembly
Steve,
I am working on the SP4B kit and have printed all the parts, I purchased the hardware kit from you also. I am working on the assembly checks and the shaft for the pendulum seems short. The distance between the bearing in the front and back is 3” and the shaft is only 3”. Also the stack up for the escapement and bushing is nearly 3” so it seems I need a longer shaft or something. Has anyone else noted this or did I do something wrong?
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tsj452
15 ene
It seems I messed up and did not red that the shaft should be 3.5” and had inadvertently placed that shaft in the click and gear 7 aassembly. Sorry for the dumb question.
SP7 Perfection :-)
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…
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Steve
10 ene
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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Nice.
Double check the mounting screw depth and adjustment on the lower standoffs. There shouldn't be much sag with 6lbs of weight. Most of the designs build in about 0.01-0.02" of upward slant to account for some sag.