I have printed several of Steve's clocks already. All of them have come out great. Decided to try the desk pendulum clock and am going crazy trying to set it. I have tried endless combinations of the Active and Static pawls. Its always the same result. No matter what I do I get a few single space clicks on the ratchet then double space clicks from that point on no matter what I do. I even tried creating what I call a Metal Hammers that's attach through the end of the pawl just to add a little more weight to the pawl. I would always make them for all the wooden clocks I used to make. I tried this on the first SP7 clock. I put the hammers on both the active and especially the static pawl to stop the static pawl dead in its tracks to stop completely the slight backward motion of the second hand. Im still adjusting the time on the first clock as it is still running slow. So moving the bob ever so little to get it perfect. But the second SP7 clock just will not work with anything. I have spent now 5 straight days trying from morning til night to get the double ticks to stop. I'm trying to hold back from finding my sledge hammer and put the clock out of its misery along with mine..... Any advise Steve??
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This clock can be a bit fiddly to get set up properly. The pendulum drive module is intended to swing an unloaded dummy pendulum. Very little energy gets added during each pass. Any excess friction will steal energy from the pendulum causing it to reduce in amplitude. Then it takes a few dummy swings before the pendulum has enough amplitude to push the ratchet enough to move.
I found the best results with the ratcheting static pawl and the smallest amount of pawl weight. The ratcheting static pawl minimizes backward movement of the ratchet without adding much extra weight. Let the clock run a minute or two to stabilize, then start adjusting the active pawl position. Move it up if the ratchet double clicks or move it down if the ratchet misses a beat and needs a bit more push. The length of the active pawl is not very important when using the ratcheting static pawl since it can land in any position and still push the ratchet.
One of my future project plans is to redo the ratchet structure on this clock. It seems like there should be a way to allow the ratchets to push for a certain portion of the swing and reduce pushing with any overswing. Then the clock would only tick once as long as the minimum swing angle is achieved. I am not sure when this change might happen.
I had this issue when I built this clock too.
Firstly, make sure your second hand was printed solid (100% infill or the preimiters that steve mentions), being counter balanced stops the double clicks if the second hand is heavy on one side.
I didn't realise this until I started building my second version, and I fixed it by glueing a small 10x4mm magnet on the top of static pawl, which added just enough pressure to stop the free movement of the cog from double clicking.