FCGear InvoluteGear

Description
Due to the favourable meshing ratio and the relatively simple production, involute gearing is the most common tooth form in mechanical engineering. Gear wheels can be found wherever movement and force are to be transferred from one part to another. For example, they can be found in machines, cars, watches or household appliances. The movement is often transferred directly from one gear wheel to the other, but sometimes also via a chain. In addition, the direction of rotation can be changed. It is also possible to change a radial movement into a linear one via an involute rack.



Usage

 * 1) Switch to the [[Image:FCGear_workbench_icon.svg|16px]] FCGear Workbench.
 * 2) There are several ways to invoke the command:
 * 3) * Press the button in the toolbar.
 * 4) * Select the option from the menu.
 * 5) Change the gear parameter to the required conditions (see Properties).

Properties
An FCGear InvoluteGear object is derived from a Part Feature object and inherits all its properties. It also has the following additional properties:

Data

 * : Default is . Change of the involute profile. Changing the value can lead to unexpected results.
 * : Default is, generates a simplified display (without teeth and only a cylinder in pitch diameter).


 * : Default is . Value of the gear width.
 * : Default is . Module is the ratio of the reference diameter of the gear divided by the number of teeth (see Notes).
 * : Default is . Number of teeth (see Notes).


 * : (read-only)
 * : (read-only) Outside diameter, measured at the addendum (the tip of the teeth).
 * : (read-only) Root diameter, measured at the foot of the teeth.
 * : (read-only) Working pitch diameter.
 * : (read-only) Pitch in the plane of rotation.


 * : Default is.
 * : Default is.
 * : Default is, changes the profile of the tooth root (see Notes).


 * : Default is . With the helix angle β a helical gear is created – positive value → rotation direction right, negative value → rotation direction left (see Notes).
 * : Default is, creates a double helix gear (see Notes).
 * : Default is . If and  is not zero, gear parameters are recomputed internally for the rotated gear.


 * : Default is (see Notes).
 * : Default is . Generates a positive and negative profile shift (see Notes).


 * : Default is . Backlash, also called lash or play, is the distance between the teeth at a gear pair.
 * : Default is (see Notes).
 * : Default is . This value is used to change the tooth height.
 * : backlash decrease or  (default) backlash increase see Notes).



Limitations
A 2D tooth profile, obtained by setting the to zero, cannot be used with features requiring a 2D shape. For example PartDesign Pad and PartDesign AdditiveHelix features do not accept such a profile as base. For technical details, please refer to the related issue on GitHub.

Standard Spur Gears
Here “standard” refers to those spur gears with no profile shift coefficient ($$x$$).


 * Helical and double helical gearing
 * = : 2
 * = + 2 *
 * = + 2 *

Scripting
Use the power of python to automate your gear modeling: