Fancy Gear Shapes-Just enough involute to matter
Let's take a second look at the Involute tooth form.
This shows a pair of full fitting involute gears.
Gears found in machines or purchased from a catalogue would have tooth form like this.
The gears I used on my first clock design also had nasty gears like this.
(that'd be the ACAD plans you can download from this website)
Take advantage that clocks run clockwise
Here is one of those things that should be obvious but isn't.
What this means to the clock maker is that
This animation shows how a standard involute gear can be modified to
Full view of the fancy gear.
The red line indicates the pitch circle diameter.
The gears have the least amount of friction when the pitch diameters are in contact and little sliding is taking place.
Let's take a look at this modified gear in action
Is this cool or what?