Involute Mac OS
Involute Mac OS
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The most common type of gear is the involute gear, which provides smooth and efficient operation. A gear is defined by the following parameters:
- Pitch diameter (diameter of gear)
- Diametral pitch (tooth size)
- Number of teeth
- Pressure angle (commonly 14.5, 20 or 25 degrees)
The pressure angle defines the shape of a tooth. For two gears to mesh the pressure angle and diametral pitch must be the same (i.e. the shape and size of the teeth must match). There is a simple relationship between pitch diameter, diametral pitch and number of teeth so when defining a gear we only need to specify two of those parameters.
The ability to create involute gears is included in python-based ADScript. Let’s see how.
This script creates a new part called Input Gear and then adds a sketch to it on the XY-plane for the profile of a gear by calling AddGearNP. NP shows which two parameters are used, N = number of teeth and P = pitch diameter.
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The 0, 0 defines the coordinates of the center of the gear.
Once the gear has been created we can read out the diametral pitch:
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There are two other functions that we can call to create gears, depending on which two parameters we wish to use.
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Here is an example script that shows how we can create two gears that can be used together to provide a 3:1 reduction ratio:
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And the result:
Involute Mac OS