DiseñoPiezas EngranajeEvolvente
DiseñoPiezas EngranajeEvolvente |
Ubicación en el Menú |
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DiseñoPiezas → Engranaje Evolvente... |
Entornos de trabajo |
DiseñoPiezas |
Atajo de teclado por defecto |
Ninguno |
Introducido en versión |
- |
Ver también |
Ambiente de trabajo FCEngranaje |
Description
Descripción
Esta herramienta permite crear un perfil 2D de un engranaje evolvente. Este perfil 2D es totalmente paramétrico, y puede ser rellenado con la función DiseñoPiezas Pad.
Para una información más detallada ver las entradas de Wikipedia para: Gear y Involute Gear
For more detailed information see Wikipedia's entries for: Gear and Involute Gear
Usage
Create the profile
Uso
Create a spur gear
- Select the gear profile in the Tree view.
- Press the PartDesign Pad button.
- Set the pad's DatosLength to the desired face width of the gear.
- Click OK
Create a helical gear
- Select the gear profile in the Tree view.
- 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 DatosHeight to the desired face width of the gear.
- To set the desired helical angle an Expression for the DatosTurns is required.
- Click the blue icon at the right of the input field.
- Enter the following formula:
Height * tan(25°) / (InvoluteGear.NumberOfTeeth * InvoluteGear.Modules * pi)
, where25°
is an example for the desired helical angle (also known as beta-value) andInvoluteGear
is the DatosName of the profile. - Click OK to close the formula editor.
- Click OK to close the task panel.
Hint: To make the helical angle an accessible parameter, use a dynamic property:
- Select the profile.
- In the Property editor activate the Show all option in the context menu.
- Again in the context 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 a space). - Click OK
- Choose
- Now a new property DatosHelical 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 DatosTurns property of the AdditiveHelix, you can now reference
InvoluteGear.HelicalAngle
instead of the hard coded value of e.g.25°
; again assumingInvoluteGear
is the DatosName of the profile.
Properties
- Engranaje externo: Verdadero o falso
- Alta precisión: Verdadero o falso
- Módulos: Diámetro del paso dividido por el número de dientes.
- Número de dientes: Establece el número de dientes.
- Ángulo de presión: Ángulo agudo entre la línea de acción y una normal a la línea que une los centros de los engranajes. Por defecto es de 20 grados. (Más información)
Limitations
- It is currently not possible to adjust the tooth thickness. Tooth and tooth space are distributed equally on the pitch circle. Thus the only way to control backlash is to adjust the center distance in a gear paring.
- There is currently no undercut in the generated gear profile. That means gears with a low number of teeth can interfere with the teeth of the mating gear. The lower limit depends on the DatosPressure Angle and is around 17 teeth for 20° and 32 for 14.5°. Most practical applications tolerate a missing undercut for gears a little smaller than this theoretical limit though.
Tutorials
Relacionados
PartDesign
- Structure tools: Part, Group
- Helper tools: Create body, Create sketch, Attach sketch, Edit sketch, Validate sketch, Check geometry, Create a sub-object(s) shape binder, Create a clone, Create a datum plane, Create a datum line, Create a datum point, Create a local coordinate system
- Modeling tools:
- 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
- Boolean: Boolean operation
- Dress-up tools: Fillet, Chamfer, Draft, Thickness
- Transformation tools: Mirrored, Linear Pattern, Polar Pattern, Create MultiTransform, Scaled
- 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
- Preferences: Preferences, Fine tuning
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, Assembly, BIM, 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