notes on prototype 2

I figured I should probably write the most important observations down, so I have sth to refer to on the presentation of my pendulum alarm clock.

Observation 1: The escapement runs a little fast; using a longer pendulum this can be adjusted.

Observation 2: The distance between the rotation axis of the wheel and the pendulum may vary over 3mm: in my test (for which prototype 2 was built) too great a distance (2mm more than in prototype 1) showed to make it run a little faster and a bit more irregular. 2mm deviation in the other direction (closer together) would inhibit the movement of the escapement. 1mm more yielded one turn more in 30s, (37/30s instead of 36/30s).

Observation 3: The minimum weight to make this configuration work properly consisted of 18 M6 nuts on a duct-tape-pulley of 9mm diameter. I used 20 because different sources from the info round said it was better to be on the safe side with the drive weight.

Observation 4: It is important always to have the pendulum and the wheel in a vertical plane. When one is misaligned on it's axis or the encasement is incorrectly placed malfunctions occur. I guess that's why a lot of pendulum clocks are wall clocks; they can easily be suspended from a nail in the wall.