Has anyone identified or published the gear tooth parameters for the game piece? We wish to use a online gear generator to create a gear with more teeth and if the gear has a real world profile I would just use them vs making something look correct. Even if our project is mostly cosmetic.
This is all I’ve seen in text form:
There’s also the CAD File and PDF drawing on the AndyMark site.
I seen the PDF for the basic layout. We are looking for the details to model a larger 15 tooth gear to properly mesh with the game piece.
Best of luck finding the details.
If that fails, you only need to model a single tooth-space pair, and distribute 15 of them around a circle. Since those gears actually do mesh, they use a ‘normal’ (but perhaps non-standard) tooth profile.
10 teeth on a 10 inch pitch diameter --> diametral pitch = 1 ::rtm::
You might try searching on gear tooth profile generator, or variations of that. I found this link immediately:
If the Pitch Diameter is 10 and the OD is 11" then that suggests that it is not a “standard” gear (meaning the addendum, dedendum, & tooth thicknesses follow standard formulas). 10T with a 10 Pitch Diameter implies DP=1. But the addendum on a standard gear is 1/DP which implies that the OD = (Nteeth+2)*DP => (10+2)*1=12"
So…
Something is wacky there.
But it shouldn’t be that hard to “guess and check” you way the right values if you have a way generate gears. You only have 5 values to match:
- DP (or module – same information)
- Pressure angle
- Circular Tooth Thickness
- Addendum
- Dedendum
It seems hard but really only DP and Pressure Angle are required to be solved at the same time and you really only have a two values to check for Pressure Angle (if FIRST didn’t use either 14.5 or 20 degrees – shame on them). Similarly, DP (or module) should only require you to check a handful of discrete values. The last 3 can be solved sequentially.
Dr. Joe J.
