FCGear InvoluteGear: Difference between revisions

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{{GuiCommand
{{GuiCommand
|Name=FCGear InvoluteGear
|Name=FCGear InvoluteGear
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==Description==
==Description== <!--T:3-->


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Due to the favourable meshing ratio and the relatively simple production, involute gearing is the most common tooth form in mechanical engineering. Gear wheels can be found wherever movement and force are to be transferred from one part to another. For example, they can be found in machines, cars, watches or household appliances.
Due to the favourable meshing ratio and the relatively simple production, involute gearing is the most common tooth form in mechanical engineering. Gear wheels can be found wherever movement and force are to be transferred from one part to another. For example, they can be found in machines, cars, watches or household appliances.
The movement is often transferred directly from one gear wheel to the other, but sometimes also via a chain. In addition, the direction of rotation can be changed. It is also possible to change a radial movement into a linear one via Involute Rack ([[File:FCGear_InvoluteRack.svg|22px|link=FCGear InvoluteRack]] [[FCGear_InvoluteRack|Create an Involute rack]]).
The movement is often transferred directly from one gear wheel to the other, but sometimes also via a chain. In addition, the direction of rotation can be changed. It is also possible to change a radial movement into a linear one via Involute Rack ([[File:FCGear_InvoluteRack.svg|22px|link=FCGear InvoluteRack]] [[FCGear_InvoluteRack|Create an Involute rack]]).


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:[[Image:Involute-Gear example.png]]
:[[Image:Involute-Gear example.png]]
:{{Caption|From left to right: Spur gearing, helical gearing, double helical gearing
:{{Caption|From left to right: Spur gearing, helical gearing, double helical gearing
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==Usage==
==Usage== <!--T:6-->


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# Switch to the [[Image:FCGear_workbench_icon.svg|22px]] [[FCGear Workbench]].
# Switch to the [[Image:FCGear_workbench_icon.svg|22px]] [[FCGear Workbench]].
# Invoke the command several way:
# Invoke the command several way:
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# Change the gear parameter to the required conditions (see {{Emphasis|Properties → Data}} below).
# Change the gear parameter to the required conditions (see {{Emphasis|Properties → Data}} below).


==Properties==
==Properties== <!--T:8-->


===Data===
===Data=== <!--T:9-->


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{{Properties_Title|Base}}
{{Properties_Title|Base}}


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* {{PropertyData|Placement}}: [[Placement|Placement]] is the location and orientation of an object in space.
* {{PropertyData|Placement}}: [[Placement|Placement]] is the location and orientation of an object in space.
* {{PropertyData|Label}}: User name of the object in the [[Tree_view|Tree view]].
* {{PropertyData|Label}}: User name of the object in the [[Tree_view|Tree view]].


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{{Properties_Title|computed}}
{{Properties_Title|computed}}


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* {{PropertyData|dw}}: Pitch diameter (not changeable, is calculated automatically).
* {{PropertyData|dw}}: Pitch diameter (not changeable, is calculated automatically).


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{{Properties_Title|gear_parameter}}
{{Properties_Title|gear_parameter}}


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* {{PropertyData|beta}}: With the helix angle β a helical gear is created (positive value → rotation direction right, negative value → rotation direction left).
* {{PropertyData|beta}}: With the helix angle β a helical gear is created (positive value → rotation direction right, negative value → rotation direction left).
* {{PropertyData|clearance}}: Default is 0,25 (see also the information in {{Emphasis|Notes}}).
* {{PropertyData|clearance}}: Default is 0,25 (see also the information in {{Emphasis|Notes}}).
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* {{PropertyData|undercut}}: {{Emphasis|True}} changes the profil of the tooth root (see also the information in {{Emphasis|Notes}}).
* {{PropertyData|undercut}}: {{Emphasis|True}} changes the profil of the tooth root (see also the information in {{Emphasis|Notes}}).


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{{Properties_Title|involute_parameter}}
{{Properties_Title|involute_parameter}}


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* {{PropertyData|pressure_parameter}}: Default is 20 (see also the information in {{Emphasis|Notes}}).
* {{PropertyData|pressure_parameter}}: Default is 20 (see also the information in {{Emphasis|Notes}}).


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{{Properties_Title|tolerance}}
{{Properties_Title|tolerance}}


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* {{PropertyData|backslash}}: Default is 0,00. Backlash, also called lash or play, is the distance between the teeths at a gear pair.
* {{PropertyData|backslash}}: Default is 0,00. Backlash, also called lash or play, is the distance between the teeths at a gear pair.
* {{PropertyData|reversed_backslash}}: {{Emphasis|True}} backlash decrease or {{Emphasis|False}} backlash increase (see also the information in {{Emphasis|Notes}}).
* {{PropertyData|reversed_backslash}}: {{Emphasis|True}} backlash decrease or {{Emphasis|False}} backlash increase (see also the information in {{Emphasis|Notes}}).


=== View ===
=== View === <!--T:20-->


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The parameter descriptions of the {{Emphasis|View}} tab will be found in [[Property_editor|Property editor]], further below at {{Emphasis|Example of the properties of a PartDesign object}}.
The parameter descriptions of the {{Emphasis|View}} tab will be found in [[Property_editor|Property editor]], further below at {{Emphasis|Example of the properties of a PartDesign object}}.


==Notes==
==Notes== <!--T:22-->


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* {{Emphasis|clearance}}: At a gear pair, clearance is the distance between the tooth tip of the first gear and the tooth root of the second gear.
* {{Emphasis|clearance}}: At a gear pair, clearance is the distance between the tooth tip of the first gear and the tooth root of the second gear.
* {{Emphasis|double_gear}}: To use the double helical gearing the helix angle β ({{Emphasis|beta}}) for the helical gearing must first be entered.
* {{Emphasis|double_gear}}: To use the double helical gearing the helix angle β ({{Emphasis|beta}}) for the helical gearing must first be entered.
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* {{Emphasis|reversed_backslash}}: If there are several gears, pay attention to which gear the parameter is set for.
* {{Emphasis|reversed_backslash}}: If there are several gears, pay attention to which gear the parameter is set for.


==Limitations==
==Limitations== <!--T:24-->


<!--T:25-->
Limitation are not known yet.
Limitation are not known yet.


==Scripting==
==Scripting== <!--T:26-->


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Use the power of python to automate your gear modeling:
Use the power of python to automate your gear modeling:
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Revision as of 07:44, 19 April 2020

FCGear InvoluteGear

Menu location
FCGear → Create an Involute gear
Workbenches
FCGear
Default shortcut
None
Introduced in version
v0.16
See also
FCGear CycloideGear

Description

Due to the favourable meshing ratio and the relatively simple production, involute gearing is the most common tooth form in mechanical engineering. Gear wheels can be found wherever movement and force are to be transferred from one part to another. For example, they can be found in machines, cars, watches or household appliances. The movement is often transferred directly from one gear wheel to the other, but sometimes also via a chain. In addition, the direction of rotation can be changed. It is also possible to change a radial movement into a linear one via Involute Rack ( Create an Involute rack).

From left to right: Spur gearing, helical gearing, double helical gearing

Usage

  1. Switch to the FCGear Workbench.
  2. Invoke the command several way:
  3. Change the gear parameter to the required conditions (see Properties → Data below).

Properties

Data

Base

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

computed

  • Datadw: Pitch diameter (not changeable, is calculated automatically).

gear_parameter

  • Databeta: With the helix angle β a helical gear is created (positive value → rotation direction right, negative value → rotation direction left).
  • Dataclearance: Default is 0,25 (see also the information in Notes).
  • Datadouble_gear: True creates a double helix gear (see also the information in Notes)
  • Datahead: Default is 0,00. This value is used to change the tooth height.
  • Dataheight: Value of the gear width.
  • Datamodule: Module is the ratio of the reference diameter of the gear divided by the number of teeth (see also the information in Notes).
  • Datanumpoints: Default is 6, change of the involute profile. Changing the value can lead to unexpected results.
  • Dataproperties_from_tool: If helix angle β is given and properties_from-tool is enabled, gear parameters are internally recomputed for the rotated gear.
  • Datashift: Default is 0,00, change of the complete tooth profile.
  • Datasimple: True generates a simplified display (without teeth and only a cylinder in pitch diameter).
  • Datateeth: Number of teeth (see also the information in Notes)
  • Dataundercut: True changes the profil of the tooth root (see also the information in Notes).

involute_parameter

  • Datapressure_parameter: Default is 20 (see also the information in Notes).

tolerance

  • Databackslash: Default is 0,00. Backlash, also called lash or play, is the distance between the teeths at a gear pair.
  • Datareversed_backslash: True backlash decrease or False backlash increase (see also the information in Notes).

View

The parameter descriptions of the View tab will be found in Property editor, further below at Example of the properties of a PartDesign object.

Notes

  • clearance: At a gear pair, clearance is the distance between the tooth tip of the first gear and the tooth root of the second gear.
  • double_gear: To use the double helical gearing the helix angle β (beta) for the helical gearing must first be entered.
  • module: Using ISO (International Organization for Standardization) guidelines, Module size is designated as the unit representing gear tooth-sizes. Module (m): m = 1 (p = 3.1416), m = 2 (p = 6.2832), m = 4 (p = 12.566). If you multiply Module by Pi, you can obtain Pitch (p). Pitch is the distance between corresponding points on adjacent teeth.
  • teeth: If the number of teeth is changed, the pitch diameter also changes (dw).
  • undercut: Undercut is used when the number of teeth of a gear is too small. Otherwise the mating gear will cut into the tooth root. An undercut leads to a weakening of the strength of the tooth!
  • pressure_parameter: Only change the parameter, if sufficient knowledge of the gear geometry is available.
  • reversed_backslash: If there are several gears, pay attention to which gear the parameter is set for.

Limitations

Limitation are not known yet.

Scripting

Use the power of python to automate your gear modeling:

import FreeCAD as App
import freecad.gears.commands
gear = freecad.gears.commands.CreateInvoluteGear.create()
gear.teeth = 20
gear.beta = 20
gear.height = 10
gear.double_helix = True
App.ActiveDocument.recompute()
Gui.SendMsgToActiveView("ViewFit")