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  below).

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


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

(All properties in this group are calculated automatically and thus read only)


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


 * : changes the profil of the tooth root (see also the information in ).
 * : changes the profil of the tooth root (see also the information in ).
 * : changes the profil of the tooth root (see also the information in ).


 * : With the helix angle β a helical gear is created – positive value → rotation direction right, negative value → rotation direction left (see also the information in ).
 * : creates a double helix gear (see also the information in )
 * : If helix angle β is given and is enabled, gear parameters are internally recomputed for the rotated gear.


 * : Default is 20° (see also the information in ).
 * : Default is 0,00, generates a positive and negative profile shift (see also the information in )


 * : Default is 0,00. Backlash, also called lash or play, is the distance between the teeths at a gear pair.
 * : Default is 0,25 (see also the information in ).
 * : Default is 0,00. This value is used to change the tooth height.
 * : backlash decrease or  backlash increase (see also the information in ).



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: