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The objective of this clock was to build a very simple clockworks and use that as a base for testing and experimenting with the escape movement.  the Great Wheel turns at the rate of once an hour

and so make the time train very simple


The tables shows the the second wheel turns once in 0.67 minutes, the second wheel once in 5 minutes and finally the Great Wheel once per hour.

The escape wheel has 20 teeth.  I used Graham Smith’s program to “test” my escape wheel design.  His program is excellent in that it “animates” the escapement to find points of interference.

I originally tried a 1º witness on the teeth but found that the CNC cutter was vibrating at the tips and breaking them off.  I changed to a 2º witness and produced the wheel you see here.

This is the printout from Graham Smiths program.   The original escape had no interference but when in increase the witness to 2º I had to increase the drop from 3º to 4º to avoid interference.

I’m hoping that with the small number of teeth and the large drop that I’ll have a more forgiving depthing between the escape and the pallets.  We’ll see.

The second wheel is a 6 inch wheel with 60 teeth.

The second wheel is a 6 inch wheel with 60 teeth.

The great wheel is an 8 inch wheel with 120 teeth.

With the wheels all cut out and tested on the depthing gage there is nothing left but to put it all together.

On the test bench with the back and front plates screwed together to ensure that the arbor holes were perfectly aligned all the arbor holes were drilled

The pallets have nice a nice width and a deep drop which is what I was trying to accomplish in this little experimental design.

The initial bore on this pinion was very slightly off center and that - stopped the clock!

I used the spoke cut outs from the great wheel as components for the bob whis is an inch and a half thick plywood with no lead.  

The clock is still on the test stand and has no time train.  Although it will not go through a full winding on the weight shown it will run for several minutes without stopping.  

It is running on 16 ounces of weight.

A nice simple time train was chosen with a 9 leaf into 36 then 12 into 36.  The result is a standard 12:1 set.

The tooth form is cycloidal.

I get the arbor spacing from the depthing tool since it allows testing before it goes on the clock.

This photo shows the set as it was mounted on the clock.  The offset to the left has no necessity attached to the placement.  (just for looks)

Small hands are applied to their arbors and the minute hand is 3 inches long

The dial is suspended from a “pin” above the time train.

The finished unit has the pendulum in front of the dial face.  

Although the clock will still “work” on 14 ounces it takes very little to cause the clock to stop and so it more often runs on 2 pounds which is still very light weight for a clock.