PartDesign InvoluteGear: Difference between revisions
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# Set the {{PropertyData|Height}} to the desired face width of the gear. |
# Set the {{PropertyData|Height}} to the desired face width of the gear. |
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# To set the desired helical angle an [[Expressions]] for the {{PropertyData|Turns}} is required. |
# To set the desired helical angle an [[Expressions]] for the {{PropertyData|Turns}} is required. |
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## Click the blue [[Image: |
## Click the blue [[Image:Bound-expression.svg|16px]] icon at reh right of the turns' input filed |
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## Enter the following formula: {{incode|Height * tan(25°) / (InvoluteGear.NumberOfTeeth * InvoluteGear.Modules * pi)}}, where {{incode|25°}} is an example for the desired helical angle (aka beta-value) and {{incode|InvoluteGear}} is the [[Object_name|Name]] of the profile. |
## Enter the following formula: {{incode|Height * tan(25°) / (InvoluteGear.NumberOfTeeth * InvoluteGear.Modules * pi)}}, where {{incode|25°}} is an example for the desired helical angle (aka beta-value) and {{incode|InvoluteGear}} is the [[Object_name|Name]] of the profile. |
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## Click {{Button|OK}} to close the formula editor. |
## Click {{Button|OK}} to close the formula editor. |
Revision as of 11:03, 8 January 2022
PartDesign InvoluteGear |
Menu location |
---|
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
- 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.
- Click the blue icon at reh right of the turns' input filed
- Enter the following formula:
Height * tan(25°) / (InvoluteGear.NumberOfTeeth * InvoluteGear.Modules * pi)
, where25°
is an example for the desired helical angle (aka beta-value) andInvoluteGear
is the Name of the profile. - Click OK to close the formula editor.
- Click OK to close the AdditiveHelix' task panel.
Hint: To make the helical angle an accessible parameter, use a dynamic property:
- In the profile's property editor, activate the Show all option in the context menu.
- Again in the contest menu, select Add Property. Note: this entry is only available when Show all is active!
- In the "Add Property" dialog
- Choose
App::PropertyAngle
as Type. - Set "Gear" as Group.
- Set "HelicalAngle" as Name (without space).
- Click OK
- Choose
- Now a new property "Helical Angle" (space added automatically), with an initial value of
0.0°
, becomes available. - Assign the desired helical angle to the new property.
- In the formula of the AdditiveHelix' DataTurns property, you can now reference
InvoluteGear.HelicalAngle
instead of the hard coded value of e.g.25°
; again assumingInvoluteGear
as the Name of the profile.
Properties
- DataExternal Gear: True or false
- DataHigh Precision: True or false
- DataModules: Pitch diameter divided by the number of teeth.
- DataNumber Of Teeth: Sets the number of teeth.
- DataPressure Angle: Acute angle between the line of action and a normal to the line connecting the gear centers. Default is 20 degrees. (More info)
Tutorials
Related
PartDesign
- Structure tools: Part, Group
- Helper tools: Create body, Create sketch, Edit sketch, Map sketch to face
- 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, Surface, TechDraw, Test Framework
- Hubs: User hub, Power users hub, Developer hub