GuiCommand: Name: FCGear InternalInvoluteGear MenuLocation: Gear , Internal Involute Gear Workbenches: FCGear_Workbench Shortcut: None Version: 1.0 SeeAlso: FCGear_InvoluteGear

FCGear InternalInvoluteGear

Description

Internal involute gears from left to right: Spur gearing, helical gearing, double helical gearing

Usage

1. Switch to the FCGear Workbench.
2. There are several ways to invoke the command:
   • Press the [ Internal Involute Gear button in the toolbar.
   • Select the Gear → [ Internal Involute Gear option from the menu.
3. Change the gear parameter to the required conditions (see Properties).

Properties

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

Data

{{Properties_Title|accuracy}}

• numpoints|Integer: Default is {{value|6}}. Change of the involute profile. Changing the value can lead to unexpected results.

{{Properties_Title|base}}

• height|Length: Default is {{value|5 mm}}. Value of the gear width.

• module|Length: Default is {{value|1 mm}}. Module is the ratio of the reference diameter of the gear divided by the number of teeth (see Notes).

• teeth|Integer: Default is {{value|15}}. Number of teeth (see Notes).

• thickness|Length: Default is {{value|5 mm}}. Thickness of the uncut outer part of the gear.

{{Properties_Title|computed}}

• angular_backlash|Angle: (read-only)

• da|Length: (read-only) Inside diameter, measured at the addendum (the tip of the teeth).

• df|Length: (read-only) Root diameter, measured at the foot of the teeth.

• dw|Length: (read-only) Working pitch diameter.

• outside_diameter|Length: (read-only) Outside diameter.

• transverse_pitch|Length: (read-only) Pitch in the plane of rotation.

{{Properties_Title|fillets}}

• head_fillet|Float: Default is {{value|0 mm}}.

• root_fillet|Float: Default is {{value|0 mm}}.

{{Properties_Title|helical}}

• beta|Angle: Default is {{value|0 °}}. With the helix angle β a helical gear is created -- positive value → rotation direction right, negative value → rotation direction left (see Notes).

• double_helix|Bool: Default is {{false}}, {{true}} creates a double helix gear (see Notes).

• properties_from_tool|Bool: Default is {{false}}. If {{true}} and beta is not zero, gear parameters are recomputed internally for the rotated gear.

{{Properties_Title|involute}}

• pressure_angle|Angle: Default is {{value|20 °}} (see Notes).

• shift|Float: Default is {{value|0}}. Generates a positive and negative profile shift (see Notes).

{{Properties_Title|precision}}

• simple|Bool: Default is {{false}}, {{true}} generates a simplified display (without teeth and only a cylinder in pitch diameter).

{{Properties_Title|tolerance}}

• backlash|Length: Default is {{value|0 mm}}. Backlash, also called lash or play, is the distance between the teeth at a gear pair.

• clearance|Float: Default is {{value|0.25}} (see Notes).

• head|Float: Default is {{value|-0.4 mm}}. This value is used to change the tooth height.

• reversed_backlash|Bool: {{true}} backlash decrease or {{false}} (default) backlash increase (see Notes).

{{Properties_Title|version}}

• version|String:

Notes

See FCGear InvoluteGear.

Useful formulas

See FCGear InvoluteGear.

Scripting

⏵ documentation index > Addons > FCGear > External Command Reference > FCGear InternalInvoluteGear

This page is retrieved from https://github.com/FreeCAD/FreeCAD-documentation/blob/main/wiki/FCGear_InternalInvoluteGear.md