SP12 pallet
Hi Steve, I'm really excited about the SP12. My first version runs perfect. In particular, the new pallet version is an excellent optimization. Do you plan to include this improvement in SP3 and SP4 as well? That would greatly enhance and stabilize the two clocks. Best Karl-Josef
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Excellent design. I just released updates to the original design with my interpretation. Each design was slightly different and I didn't include any mechanism for setting the beat other than tilting the clock frame. The tall clocks have a good weight distribution that can allow a few degrees of tilt. The update includes adjustable height standoffs.
Several things can affect the rate of the clock. Gaining 15 minutes per day is a big change. Adding weight above the center of mass will reduce the effective length, causing it to run faster. The rate can also change if the beat changes, although it can be difficult to predict. Adding drive weight should increase the pendulum amplitude which should slow it down. It also adds friction in the "dead" portions of the deadbeat cycle which may slow it down as well. My suspicion is that the biggest effect from the pallet change is that removing slop allows the pendulum to be impulsed earlier and making it run faster.
Calculations show that the length may need to be increased by about 1cm to slow down by 15 minutes per day. The most obvious method is to build a longer pendulum shaft. A potential simple solution is to remove weights from the upper two pockets inside the pendulum bob. Possibly remove weight from four pockets.
Steve