« Last post by jss on April 22, 2017, 09:34:09 AM »
This may give some suggestions
This comes from Clayton Boyer Woodworking Designs
Why doesn’t my clock run?
When I put a clock into beat and it has a good, even balanced 'tick, tock', and yet only runs for a few minutes, the first thing I do is start marking teeth and pinions. I go through the train marking each set of gears where they have stopped together. Then I start up the clock again and when it stops, see if any of the pairs match again. I have lots of pencil marks on my clock wheels.
Eccentric wheels are another very common cause stopping new clocks. Rather than using the original drawings in the plan, people use Xerox copies of clock plans, and the copy machines don't always copy true, leaving them with egg-shaped wheels. I never use copies.
When looking for what's stopping a clock, I ALWAYS start at the escape end of the train and work down. Very little stops the weight end, but it takes very little to stop the escape end. So, those are the three things I would check first, proper tooth mesh, out of round wheels, and internal friction. There are, of course, a few thousand other possibilities, but those three are the most common reasons for a clock that wants to stop.
Just thought of another...Are you applying any finish between the teeth? If you are, I have a suggestion - don't. The application of any finish between the teeth increases internal friction of the clockworks dramatically. Finish not only makes teeth gummy, it also takes up critical space between the teeth. A clock that works great dry, will, many times, stop dead when finish is applied. It's happened way too many times, and now when I finish a clock I spray it - and try to keep the spray out of the teeth and just on the faces.
Also, poly finishes never really dry. In the fluctuating humidity here in Hawaii I found that during very humid times the clocks sprayed with polyurethane get just gummy enough to stop the train. I've contacted the people at MinWax about this, and having never made a wooden clockworks, they didn't have a solution. They recommended I use their Helmsman Poly since it was designed for boats. It gums too. Just not as bad. So now I avoid anything hitting between the teeth.