Revisiting an old hobby
Hello from Scotland.
I recently re-awakened an interest from my youth in watches and clocks. Strangely the catalyst was searching for a replacement hand for a Starrett dial indicator that I picked up for pennies on ebay and which I though might be useful for leveling the bed on my 3d printer. It was missing the dial hand, which looked very like a watch second hand, so that led to a search for a suitable donor watch. Needless to say I then got distracted by the vast array of old time pieces
I was working on an erratic movement recently, and trying to figure out why it kept stopping, here are a couple of tg-timer graphs that illustrate the issue very nicely.
Just for the record, the issue was a tiny spec of dirt on the edge of one of the teeth of the pallet wheel of a Timex model 32 movement, but the movement in question is not really relevant.
Note how on the vertical chart (the time axis) the rate speeds up as the dirt comes in to contact with the first pin of the