FCGear WormGear

Description
The worm can be considered a special case of a helical gear. Imagine that there is only one tooth on a spur gear. Now increase the helix angle so much that the tooth winds around the spur gear several times before it emerges on the opposite side. The result would be a single thread worm.

For a single-start worm, each full turn (360 degrees) of the worm advances the gear by one tooth. So a gear with 24 teeth will provide a gear reduction of 24:1. For a multi-start worm, the gear reduction equals the number of teeth on the gear, divided by the number of starts on the worm.

A worm can only be used with a worm wheel. This is called a worm drive. Like other gear arrangements, a worm drive can reduce rotational speed or transmit higher torque. One of the major advantages of worm gear drive units are that they can transfer motion in 90 degrees. A worm drive is also self-locking.


 * [[Image:Worm-Gear_example.png]]

Usage

 * 1) Switch to the [[Image:FCGear_workbench_icon.svg|22px]] FCGear Workbench.
 * 2) Invoke the command several way:
 * 3) * Press the FCGear_WormGear.svg Create a Worm gear button in the tool bar.
 * 4) * Using the.
 * 5) Change the gear parameter to the required conditions (see  below).

Data

 * : Placement is the location and orientation of an object in space.
 * : User name of the object in the Tree view.


 * : Lead angle, not changeable - is calculated automatically (see also the information in and ).
 * : Default is 0,25 (see also the information in ).
 * : Pitch diameter.
 * : Default is 0,00. This value is used to change the tooth height.
 * : Value of the worm length.
 * : Module is the ratio of the reference diameter of the gear divided by the number of teeth (see also the information in ).
 * : change the rotating direction from right to left.
 * : Number of teeth (see also the information in ).


 * : Default is 20 (see also the information in ).

View
The parameter descriptions of the tab will be found in Property editor, further below at.

Limitations
Limitation are not known yet.

Useful formulas

 * = arctan ( * : )
 * = arctan ( : ( * ))
 * = 4,5 * *
 * = 4,5 * *

Worm wheel
The worm wheel must be designed manually. For this purpose can be used for a simple construction. In any case, in-depth knowledge of the gear types is required.


 * [[Image:Worm-Gear example3.png]]