FCGear InvoluteRack/it: Difference between revisions

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<languages/>
<languages/>


<div class="mw-translate-fuzzy">
{{Docnav/it
{{Docnav/it
|[[FCGear_InvoluteGear/it|Ingranaggio a spirale]]
|[[FCGear_InvoluteGear/it|Ingranaggio a spirale]]
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|IconC=FCGear_workbench_icon.svg
|IconC=FCGear_workbench_icon.svg
}}
}}
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<div class="mw-translate-fuzzy">
{{GuiCommand/it
{{GuiCommand/it
|Name=FCGear InvoluteRack
|Name=FCGear InvoluteRack
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|SeeAlso=[[FCGear InvoluteGear/it|Ingranaggio a spirale]]
|SeeAlso=[[FCGear InvoluteGear/it|Ingranaggio a spirale]]
}}
}}
</div>


==Description==
==Descrizione==


Gear racks are used to convert a rotary motion into a linear motion or vice versa. The following examples show the different applications:
Gear racks are used to convert a rotary motion into a linear motion or vice versa. The following examples show the different applications:
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* Pneumatic rack and pinion drives used to control valves in pipeline transport.
* Pneumatic rack and pinion drives used to control valves in pipeline transport.


:[[Image:Involute-Rack_example.png]]
[[Image:Involute-Rack_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}}
}}


==Usage==
==Usage==


# Switch to the [[Image:FCGear_workbench_icon.svg|22px]] [[FCGear Workbench|FCGear Workbench]].
# Switch to the [[Image:FCGear_workbench_icon.svg|16px]] [[FCGear_Workbench|FCGear Workbench]].
# Invoke the command several way:
# There are several ways to invoke the command:
#* Press the [[File:FCGear_InvoluteRack.svg|22px|link=FCGear InvoluteRack]] [[FCGear_InvoluteRack|Create an Involute rack]] button in the tool bar.
#* Press the {{Button|[[File:FCGear_InvoluteRack.svg|16px]] [[FCGear_InvoluteRack|Involute Rack]]}} button in the toolbar.
#* Using the {{MenuCommand|Gear Menu → Involute rack}}.
#* Select the {{MenuCommand|Gear → [[File:FCGear_InvoluteRack.svg|16px]] Involute Rack}} option from the menu.
# Change the gear parameter to the required conditions (see {{Emphasis|Properties → Data}} below).
# Change the gear parameter to the required conditions (see [[#Properties|Properties]]).


==Properties==
==Properties==

An FCGear InvoluteRack object is derived from a [[Part_Feature|Part Feature]] object and inherits all its properties. It also has the following additional properties:


===Data===
===Data===


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


⚫
* {{PropertyData|add_endings|Bool}}: If {{True}} (default), then the total length of the rack is teeth * pitch. If {{False}}, then the rack starts with a tooth-flank.
* {{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|height|Length}}: Default is {{Value|5 mm}}. Value of the gear width.
⚫
* {{PropertyData|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|Notes]]).
⚫
* {{PropertyData|teeth|Integer}}: Default is {{Value|15}}. Number of teeth.
⚫
* {{PropertyData|thickness|Length}}: Default is {{Value|5}}. Height from the tooth root to the lower side of the rod.


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


* {{PropertyData|transverse_pitch}}: Pitch in the transverse plane – not changeable, is calculated automatically (see also the information in {{Emphasis|Notes}}).
* {{PropertyData|transverse_pitch|Length}}: (read-only) Pitch in the transverse plane (see [[#Notes|Notes]]).


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


* {{PropertyData|head_fillet|Float}}: Default is {{Value|0 mm}}.
⚫
* {{PropertyData|add_endings}}: If {{Emphasis|True}}, than the total length of the rack is teeth * pitch, otherwise the rack starts with a tooth-flank.
* {{PropertyData|root_fillet|Float}}: Default is {{Value|0 mm}}.
⚫
* {{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|double_helix}}: {{Emphasis|True}} creates a double helix gear (see also the information in {{Emphasis|Notes}})
⚫
* {{PropertyData|head}}: Default is 0,00. This value is used to change the tooth height.
* {{PropertyData|height}}: Value of the gear width.
⚫
* {{PropertyData|module}}: Module is the ratio of the reference diameter of the gear divided by the number of teeth (see also the information in {{Emphasis|Notes}}).
⚫
* {{PropertyData|properties_from_tool}}: If helix angle β is given and {{Emphasis|properties_from-tool}} is enabled, gear parameters are internally recomputed for the rotated gear.
⚫
* {{PropertyData|simplified}}: {{Emphasis|True}} generates a simplified display (without teeth).
⚫
* {{PropertyData|teeth}}: Number of teeth
⚫
* {{PropertyData|thickness}}: Height from the tooth root to the lower side of the rod.


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


⚫
* {{PropertyData|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.
⚫
* {{PropertyData|pressure_parameter}}: Default is 20 (see also the information in {{Emphasis|Notes}}).
⚫
* {{PropertyData|double_helix|Bool}}: Default is {{False}}, {{True}} creates a double helix gear (see [[#Notes|Notes]]).
⚫
* {{PropertyData|properties_from_tool|Bool}}: Default is {{False}}. If {{True}} and {{PropertyData|beta}} is not zero, gear parameters are recomputed internally for the rotated gear.


{{Properties_Title|involute}}
=== View ===


⚫
* {{PropertyData|pressure_angle|Angle}}: Default is {{Value|20 °}} (see [[#Notes|Notes]]).
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}}.

{{Properties_Title|precision}}

⚫
* {{PropertyData|simplified|Bool}}: Default is {{False}}, {{True}} generates a simplified display (without teeth).

{{Properties_Title|tolerance}}

⚫
* {{PropertyData|clearance|Float}}: Default is {{Value|0.25}} (see [[#Notes|Notes]]).
⚫
* {{PropertyData|head|Float}}: Default is {{Value|0}}. This value is used to change the tooth height.

{{Properties_Title|version}}

* {{PropertyData|version|String}}:


==Notes==
==Notes==


* {{Emphasis|transverse_pitch}}: The value is the result of multiplication of {{Emphasis|module * pi}}. This means for the standard involute rack of FCGear: 15 ({{Emphasis|teeth}}) * 3,14 ({{Emphasis|transverse_pitch}}) is 47.12 mm. See also {{Emphasis|module}} further below.
* {{Emphasis|transverse_pitch}}: The value is the result of multiplication of {{Emphasis|module * pi}}. This means for the standard involute rack of FCGear: 15 ({{Emphasis|teeth}}) * 3.14 ({{Emphasis|transverse_pitch}}) is 47.12 mm. See also {{Emphasis|module}} further below.
* {{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_helix}}: To use the double helical gearing the helix angle β ({{Emphasis|beta}}) for the helical gearing must first be entered.
* {{Emphasis|double_helix}}: 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|pressure_parameter}}: Only change the parameter, if sufficient knowledge of the gear geometry is available.
* {{Emphasis|pressure_parameter}}: Only change the parameter, if sufficient knowledge of the gear geometry is available.


==Limitations==
==Useful formulas==


⚫
See [[FCGear_InvoluteGear#Useful_formulas|FCGear InvoluteGear]].
No limitations are known.


==Scripting==
==Scripting==
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Gui.SendMsgToActiveView("ViewFit")
Gui.SendMsgToActiveView("ViewFit")
}}
}}

⚫
{{Docnav

⚫
|[[FCGear_InvoluteGear|FCGear InvoluteGear]]
<div class="mw-translate-fuzzy">
⚫
|[[FCGear_CycloideGear|FCGear CycloideGear]]
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{{Docnav/it
⚫
|[[FCGear Workbench|FCGear Workbench]]
|[[FCGear_InvoluteGear/it|Ingranaggio a spirale]]
⚫
|[[FCGear_CycloideGear/it|Ingranaggio cicloidale]]
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|[[FCGear Workbench/it|FCGear]]
|IconL=FCGear_InvoluteGear.svg
|IconL=FCGear_InvoluteGear.svg
|IconR=FCGear_CycloideGear.svg
|IconR=FCGear_CycloideGear.svg
|IconC=FCGear_workbench_icon.svg
|IconC=FCGear_workbench_icon.svg
}}
}}
</div>


[[Category:Addons{{#translation:}}]]
[[Category:Addons{{#translation:}}]]

Latest revision as of 17:51, 7 October 2022

Other languages:

Cremagliera

Posizione nel menu
FCGear → Create an Involute rack
Ambiente
FCGear
Avvio veloce
None
Introdotto nella versione
0.16
Vedere anche
Ingranaggio a spirale

Descrizione

Gear racks are used to convert a rotary motion into a linear motion or vice versa. The following examples show the different applications:

  • A rack with gear on at a retaining weir.
  • Various rack systems of rack-and-pinion railways.
  • Rack and pinion steering in a vehicle.
  • Rack and pinion winch as mechanical hoist (e.g. car jack).
  • Pneumatic rack and pinion drives used to control valves in pipeline transport.

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 Involute Rack button in the toolbar.
    • Select the Gear → Involute Rack option from the menu.
  3. Change the gear parameter to the required conditions (see Properties).

Properties

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

Data

base

  • Datiadd_endings (Bool): If true (default), then the total length of the rack is teeth * pitch. If false, then the rack starts with a tooth-flank.
  • Datiheight (Length): Default is 5 mm. Value of the gear width.
  • Datimodule (Length): Default is 1 mm. Module is the ratio of the reference diameter of the gear divided by the number of teeth (see Notes).
  • Datiteeth (Integer): Default is 15. Number of teeth.
  • Datithickness (Length): Default is 5. Height from the tooth root to the lower side of the rod.

computed

  • Datitransverse_pitch (Length): (read-only) Pitch in the transverse plane (see Notes).

fillets

  • Datihead_fillet (Float): Default is 0 mm.
  • Datiroot_fillet (Float): Default is 0 mm.

helical

  • Datibeta (Angle): Default is 0 °. With the helix angle β a helical gear is created – positive value → rotation direction right, negative value → rotation direction left.
  • Datidouble_helix (Bool): Default is false, true creates a double helix gear (see Notes).
  • Datiproperties_from_tool (Bool): Default is false. If true and Datibeta is not zero, gear parameters are recomputed internally for the rotated gear.

involute

  • Datipressure_angle (Angle): Default is 20 ° (see Notes).

precision

  • Datisimplified (Bool): Default is false, true generates a simplified display (without teeth).

tolerance

  • Daticlearance (Float): Default is 0.25 (see Notes).
  • Datihead (Float): Default is 0. This value is used to change the tooth height.

version

  • Dativersion (String):

Notes

  • transverse_pitch: The value is the result of multiplication of module * pi. This means for the standard involute rack of FCGear: 15 (teeth) * 3.14 (transverse_pitch) is 47.12 mm. See also module further below.
  • 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_helix: 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. The result of the multiplication is displayed in transverse_pitch
  • pressure_parameter: Only change the parameter, if sufficient knowledge of the gear geometry is available.

Useful formulas

See FCGear InvoluteGear.

Scripting

Use the power of python to automate your gear modeling: 

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


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