Monday, December 29, 2014

Clock #1 plans

Here is a plan for a simple clock mechanism with an anchor escapement and co-axial hands.
The drive train has the following teeth counts, which give a ratio of 240:
  • Escape wheel: 15 teeth, rotates 4 times per minute, 1 second per tooth
  • Escape pinion: 6 teeth
  • Fourth wheel: 30 teeth
  • Fourth pinion: 6 teeth
  • Third wheel: 36 teeth
  • Third pinion: 6 teeth
  • Center wheel: 48 teeth (rotates once per hour)
Thus far, I've cut the center, third, and fourth wheels, along with all of the pinions.  The escape wheel remains to be cut, along with the motion work.  The motion work includes four gears giving a ratio of 1/12:
  • Center pinion: 6 teeth (rotates once per hour)
  • Offset wheel: 18 teeth
  • Offset pinion: 8 teeth
  • Hour wheel: 16 (rotates twice per day)
The third, fourth, and escape arbors are as described here.  The pendulum arbor is longer.  The center and hour arbors are more complex as they need to fit together coaxially as shown below.



The escapement is a deadbeat anchor escapement as shown below.

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