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Unread 09-10-2017, 05:32 AM
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Steamworks gear parameters

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.
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Unread 09-10-2017, 07:09 AM
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Re: Steamworks gear parameters

This is all I've seen in text form:
Quote:
Originally Posted by 2017 Game Manual
3.12.2 GEARS
A GEAR is a toothed wheel used to start ROTORS on the AIRSHIP. Each GEAR is made from gold (Pantone PMC 124C) polypropylene, has 10 teeth, an 11 in. (~28 cm) diameter, 10 in. (~25 cm) pitch diameter, and is 2 in. (~5 cm) thick. Each GEAR weighs 18.4 oz. (~0.5 kg.) GEARS may be purchased from AndyMark (am-3302).
There's also the CAD File and PDF drawing on the AndyMark site.
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Unread 09-10-2017, 10:05 AM
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Re: Steamworks gear parameters

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.
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Unread 09-10-2017, 04:09 PM
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Re: Steamworks gear parameters

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.
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Unread 09-10-2017, 04:46 PM
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Re: Steamworks gear parameters

10 teeth on a 10 inch pitch diameter --> diametral pitch = 1

You might try searching on gear tooth profile generator, or variations of that. I found this link immediately:

http://geargenerator.com/#700,700,10...0,0,0,0,2,-420
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Unread 09-10-2017, 06:40 PM
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Re: Steamworks gear parameters

Quote:
Originally Posted by Richard Wallace View Post
10 teeth on a 10 inch pitch diameter --> diametral pitch = 1

You might try searching on gear tooth profile generator, or variations of that. I found this link immediately:

http://geargenerator.com/#700,700,10...0,0,0,0,2,-420
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.

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Unread 09-10-2017, 07:00 PM
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Re: Steamworks gear parameters

Here's an IBL file for a 15T gear that looks decent.
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Name:	15TGear.JPG
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Size:	59.5 KB
ID:	22510  
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File Type: zip 15TGEAR.zip (9.0 KB, 2 views)
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