After trying many combination of pawls on the electromagnetic clock and not being satisfied with
the results. I came up with the idea as shown on the video. I redesigned the two pawls and reprinted them. As you can see I added a 3mm screw to each pawl. The top pawl screw can be adjusted to only
allow the pawl to stay engaged in the ratchet wheel for just a portion of pendulum swing and then the pawl disengages. As the pendulum swings back the top paw can ride on the 3mm screw head of the bottom pawl. This screw is also adjustable to prevent the top pawl from dropping into the second tooth on the ratchet wheel. The weight on the bottom pawl is a magnet only because it was the right size and weight. This weight allows the bottom pawl to pull back the ratchet wheel. Moving the pendulum by hand, adjust the top screw until the ratchet wheel allows the bottom pawl to drop behind the ratchet wheel tooth. The amplitude of the pendulum is no longer a problem, low batteries or fresh ones.
I have this modification on both of my EM clocks and they are keeping very good time.
Hi Steve....Yes it very tolerant and easy to adjust. It is best to move the pendulum by hand while making the adjustments. The thing I like about it is immune to pendulum amplitude. I found adjusting the top screw so it allowes the pawl push the ratchet wheel enough for the bottom pawl to fall behind the ratchet tooth plus just a little. Then by hand move the pendulum back (to your right when looking at the back of the clock) and adjust the bottom screw so that it keeps the top pawl from dropping into second tooth. In my case I used the 6th screw hole from the top of the pendulum arm to attach the pivot block for the top pawl. I designed both pawls a bit wider so I could put the screw head under the top pawl. The small weight on top of the bottom pawl helps bring the ratchet wheel back into position for the next cycle.
That is a very clever design. Thanks for posting.
Is it hard to adjust to work reliably? Or is it fairly tolerant, so it works great once it is close?