PartDesign InvoluteGear: Difference between revisions

Revision as of 19:38, 26 December 2021

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Sprocket

Shaft design wizard

PartDesign

Menu location
PartDesign InvoluteGear
Part Design → Involute gear...
Workbenches
PartDesign
Default shortcut
None
Introduced in version
-
See also
FCGear Workbench

Description

This tool allows you to create a 2D profile of an involute gear. This 2D profile is fully parametric, and can be padded with the PartDesign Pad or PartDesign AdditiveHelix feature.

For more detailed information see Wikipedia's entries for: Gear and Involute Gear

Usage

Create the Profile

Go to the menu Part Design → Involute gear....
Set the Involute parameters.
Click OK
The involute gear is created outside of the active body. Drag and drop it into a body for the application of further features like padding.

Create a Spur Gear

Select the gear profile in the tree.
Press the Pad button.
Set the pad's DataLength to the desired face width of the gear.
Click OK

Create a Helical Gear introduced in version 0.19

Select the gear profile in the tree.
Press the PartDesign AdditiveHelix button.
Choose as Axis the normal of the gear profile, that is Normal sketch axis introduced in version 0.20. (In earlier versions the Base Z axis can be used as long as the profile's plane has not been altered.)
Choose a Height-Turns mode.
Set the DataHeight to the desired face width of the gear.
To set the desired helical angle an Expressions for the DataTurns is required.
1. Click the blue File:Sketcher Expressions.png icon at reh right of the turns' input filed
2. Enter the following formula: Height * tan(25°) / (InvoluteGear.NumberOfTeeth * InvoluteGear.Modules * pi), where 25° is the desired helical angle (aka beta-value) and InvoluteGear is the Name of the profile.

Parameters

Number of teeth: Sets the number of teeth.

Modules: Pitch diameter divided by the number of teeth.

Pressure angle: Acute angle between the line of action and a normal to the line connecting the gear centers. Default is 20 degrees. (More info)

High precision: True or false

External gear: True or false

Tutorials

How to make gears in FreeCAD

Modeling tools
- Datum tools: Create a datum point, Create a datum line, Create a datum plane, Create a local coordinate system, Create a shape binder, Create a sub-object(s) shape binder, Create a clone
- Additive tools: Pad, Revolution, Additive loft, Additive pipe, Additive helix, Additive box, Additive cylinder, Additive sphere, Additive cone, Additive ellipsoid, Additive torus, Additive prism, Additive wedge
- Subtractive tools: Pocket, Hole, Groove, Subtractive loft, Subtractive pipe, Subtractive helix, Subtractive box, Subtractive cylinder, Subtractive sphere, Subtractive cone, Subtractive ellipsoid, Subtractive torus, Subtractive prism, ‎Subtractive wedge

Transformation tools: Mirrored, Linear Pattern, Polar Pattern, Create MultiTransform, Scaled
Dress-up tools: Fillet, Chamfer, Draft, Thickness
Boolean: Boolean operation

Extras: Migrate, Sprocket, Involute gear, Shaft design wizard
Context menu: Set tip, Move object to other body, Move object after other object, Appearance, Color per face

User documentation

Getting started
Installation: Download, Windows, Linux, Mac, Additional components, Docker, AppImage, Ubuntu Snap
Basics: About FreeCAD, Interface, Mouse navigation, Selection methods, Object name, Preferences, Workbenches, Document structure, Properties, Help FreeCAD, Donate

Help: Tutorials, Video tutorials
Workbenches: Std Base, Arch, Assembly, CAM, Draft, FEM, Inspection, Mesh, OpenSCAD, Part, PartDesign, Points, Reverse Engineering, Robot, Sketcher, Spreadsheet, Start, Surface, TechDraw, Test Framework, Web

Addons: Addon Manager, External workbenches, Scripting and macros

Hubs: User hub, Power users hub, Developer hub

@@ Line 23: / Line 23: @@
 <!--T:2-->
-This tool allows you to create a 2D profile of an involute gear. This 2D profile is fully parametric, and can be padded with the [[PartDesign_Pad|PartDesign Pad]] feature.
+This tool allows you to create a 2D profile of an involute gear. This 2D profile is fully parametric, and can be padded with the [[PartDesign_Pad|PartDesign Pad]] or [[PartDesign_AdditiveHelix |PartDesign AdditiveHelix]] feature.
 <!--T:21-->
@@ Line 33: / Line 33: @@
 ==Usage== <!--T:22-->
+=== Create the Profile ===
 <!--T:6-->
@@ Line 39: / Line 41: @@
 # Click {{Button|OK}}
 # The involute gear is created outside of the active body. Drag and drop it into a body for the application of further features like padding.
+=== Create a Spur Gear ===
+# Select the gear profile in the tree.
+# Press the {{Button|[[Image:PartDesign_Pad.svg|16px]] '''Pad'''}} button.
+# Set the pad's {{PropertyData|Length}} to the desired face width of the gear.
+# Click {{Button|OK}}
+=== Create a Helical Gear {{Version|0.19}} ===
+# Select the gear profile in the tree.
+# Press the {{Button|[[Image:PartDesign_AdditiveHelix.svg|16px]] [[PartDesign_AdditiveHelix|PartDesign AdditiveHelix]]}} button.
+# Choose as Axis the normal of the gear profile, that is '''Normal sketch axis''' {{Version|0.20}}. (In earlier versions the '''Base Z axis''' can be used as long as the profile's plane has not been altered.)
+# Choose a '''Height-Turns''' mode.
+# Set the {{PropertyData|Height}} to the desired face width of the gear.
+# To set the desired helical angle an [[Expressions]] for the {{PropertyData|Turns}} is required.
+## Click the blue [[Image:Sketcher_Expressions.png|16px]] icon at reh right of the turns' input filed
+## Enter the following formula: {{incode|Height * tan(25°) / (InvoluteGear.NumberOfTeeth * InvoluteGear.Modules * pi)}}, where {{incode|25°}} is the desired helical angle (aka beta-value) and {{incode|InvoluteGear}} is the [[Object_name|Name]] of the profile.
 == Parameters == <!--T:17-->