FCGear CrownGear/it: Difference between revisions

From FreeCAD Documentation
No edit summary
(Updating to match new version of source page)
 
(14 intermediate revisions by 2 users not shown)
Line 1: Line 1:
<languages/>
<languages/>


<div class="mw-translate-fuzzy">
{{Docnav/it
{{Docnav/it
|[[FCGear_WormGear/it|Vite senza fine]]
|[[FCGear_WormGear/it|Vite senza fine]]
|[[FCGear_TimingGear/it|Ingranaggio di distribuzione]]
|
|[[FCGear Workbench/it|FCGear]]
|[[FCGear Workbench/it|FCGear]]
|IconL=FCGear_WormGear.svg
|IconL=FCGear_WormGear.svg
|IconR=FCGear_TimingGear.svg
|
|IconC=FCGear_workbench_icon.svg
|IconC=FCGear_workbench_icon.svg
}}
}}
</div>


<div class="mw-translate-fuzzy">
{{GuiCommand/it
{{GuiCommand/it
|Name=FCGear CrownGear
|Name=FCGear CrownGear
Line 19: Line 22:
|SeeAlso=[[FCGear InvoluteGear/it|Ingranaggi a evolvente]]
|SeeAlso=[[FCGear InvoluteGear/it|Ingranaggi a evolvente]]
}}
}}
</div>


<span id="Description"></span>
==Descrizione==
==Descrizione==


Line 31: Line 36:
* Powered tool systems with multiple pinions and a crown gear
* Powered tool systems with multiple pinions and a crown gear


:[[File:Crown-Gear example.png]]
[[File:Crown-Gear_example.png]]
:{{Caption|Above: Crown gear}}
{{Caption|Above: Crown gear}}


==Usage==
==Usage==


# Switch to the [[Image:FCGear_workbench_icon.svg|22px]] [[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_CrownGear.svg|22px|link=FCGear CrownGear]] [[FCGear_CrownGear|Create a Crown gear]] button in the tool bar.
#* Press the {{Button|[[File:FCGear_CrownGear.svg|16px]] [[FCGear_CrownGear|Crown Gear]]}} button in the toolbar.
#* Using the {{MenuCommand|Menu → Crown gear}}.
#* Select the {{MenuCommand|Gear [[File:FCGear_CrownGear.svg|16px]] Crown Gear}} option from the menu.
# The crown gear is displayed without teeth by default. ({{Version|0.21}})
# Change the gear parameter to the required conditions (see {{Emphasis|Properties → Data}} below).
# Change the gear parameters to the required conditions (see [[#Properties|Properties]]).
# Set the {{PropertyData|preview_mode}} property to {{false}} to display the teeth (see [[#Notes|Notes]]).


==Properties==
==Properties==


An FCGear CrownGear 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}}

* {{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]].


{{Properties_Title|accuracy}}
{{Properties_Title|accuracy}}


* {{PropertyData|construct}}: Default is {{Emphasis|True}}. Change to {{Emphasis|False}} and the construction component disappears.
* {{PropertyData|num_profiles|Integer}}: Default is {{Value|4}}. Number of profiles used for loft.
* {{PropertyData|num_profiles}}: Number of profiles used for loft.
* {{PropertyData|preview_mode|Bool}}: Default is {{True}}.


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


* {{PropertyData|height}}: Value for the gear width.
* {{PropertyData|height|Length}}: Default is {{Value|2 mm}}. Value for the tooth 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|Note}}).
* {{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|other_teeth}}: Number of teeth of the other gear (pinion). See also the information in {{Emphasis|Note}}.
* {{PropertyData|other_teeth|Integer}}: Default is {{Value|15}}. Number of teeth of the construction gear (pinion) (see [[#Notes|Notes]]).
* {{PropertyData|teeth}}: Number of teeth
* {{PropertyData|teeth|Integer}}: Default is {{Value|15}}. Number of teeth.
* {{PropertyData|thickness}}: Height from the tip of tooth to the lower side of the crown wheel.
* {{PropertyData|thickness|Length}}: Default is {{Value|5 mm}}. Height from the tip of tooth to the lower side of the crown wheel.


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


* {{PropertyData|pressure_parameter}}: Default is 20 (see also the information in {{Emphasis|Note}}).
* {{PropertyData|pressure_angle|Angle}}: Default is {{Value|20 °}} (see [[#Notes|Notes]]).


{{Properties_Title|version}}
=== View ===


* {{PropertyData|version|String}}:
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==


* The {{PropertyData|preview_mode}} property is set to {{true}} by default and when the gear is created you'll find this message in the report view:
*: ''Gear module: Crown gear created, preview_mode = true for improved performance. Set preview_mode property to false when ready to cut teeth.''
* {{Emphasis|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.
* {{Emphasis|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.
* {{Emphasis|other_teeth}}: Several pinions with the same number of teeth only can be used on one crown wheel.
* {{Emphasis|other_teeth}}: Several pinions with the same number of teeth only can be used on one crown wheel.
* {{Emphasis|pressure_parameter}}: Only change the parameter, if sufficient knowledge of the gear geometry is available.
* The geometry of the crown gear is primarily determined by the spur pinion geometry ({{Emphasis|other_teeth}}).
* Create spur gear with [[FCGear_InvoluteGear|Involute gear]]. The number of teeth must be identical to the parameter {{Emphasis|other_teeth}} of the crown gear.
* Adjustments for optimal running characteristics can be made with the parameters of involute gear.


==Crown and spur gear set overview==
==Limitations==


[[File:Crown-spur-gear-set example.png]]
No limitations are known.


* (1) Spur gear
{{Docnav
* (2) Crown gear
|[[FCGear_WormGear|FCGear WormGear]]
* (3) Tooth width
|
* (4) Inner diameter
|[[FCGear Workbench|FCGear Workbench]]
* (5) Outer diameter

==Useful formulas==

*'''Inner diameter (4)'''
**{{Emphasis|inner diamter}} = {{Emphasis|module (spur gear)}} * {{Emphasis|teeth (crown gear)}} * {{Emphasis|cos pressure_paramter (pinion)}} : {{Emphasis|cos pressure_parameter (crown gear)}}

*'''Outer diameter (5)'''
**{{Emphasis|outer diamter}} = {{Emphasis|inner diameter}} + {{Emphasis|2x height (tooth width crown gear)}}


<div class="mw-translate-fuzzy">
{{Docnav/it
|[[FCGear_WormGear/it|Vite senza fine]]
|[[FCGear_TimingGear/it|Ingranaggio di distribuzione]]
|[[FCGear Workbench/it|FCGear]]
|IconL=FCGear_WormGear.svg
|IconL=FCGear_WormGear.svg
|IconR=FCGear_TimingGear.svg
|
|IconC=FCGear_workbench_icon.svg
|IconC=FCGear_workbench_icon.svg
}}
}}
</div>


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

Latest revision as of 20:28, 29 April 2023

Other languages:

Corona dentata

Posizione nel menu
FCGear → Create an Crown gear
Ambiente
FCGear
Avvio veloce
None
Introdotto nella versione
v0.16
Vedere anche
Ingranaggi a evolvente

Descrizione

The crown wheel resembles a ring-shaped curved rack. The pressure angle decreases continuously from the outer to the inner diameter. Thus, the variable peripheral speed at the crown wheel is compensated against the constant peripheral speed of the pinion. The pointed outer teeth and the steep tooth flanks on the inner diameter limit the usable tooth width. Crown gears achieve similar efficiencies as spur gears. One crown gear can drive several pinions.

Known field of application of crown gears:

  • Rear axle drives for cars and motorcycles
  • Swivel mechanism for operating tables
  • Angular milling heads
  • Powered tool systems with multiple pinions and a crown gear

Above: Crown gear

Usage

  1. Switch to the FCGear Workbench.
  2. There are several ways to invoke the command:
    • Press the Crown Gear button in the toolbar.
    • Select the Gear → Crown Gear option from the menu.
  3. The crown gear is displayed without teeth by default. (introduced in version 0.21)
  4. Change the gear parameters to the required conditions (see Properties).
  5. Set the Datipreview_mode property to false to display the teeth (see Notes).

Properties

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

Data

accuracy

  • Datinum_profiles (Integer): Default is 4. Number of profiles used for loft.
  • Datipreview_mode (Bool): Default is true.

base

  • Datiheight (Length): Default is 2 mm. Value for the tooth 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).
  • Datiother_teeth (Integer): Default is 15. Number of teeth of the construction gear (pinion) (see Notes).
  • Datiteeth (Integer): Default is 15. Number of teeth.
  • Datithickness (Length): Default is 5 mm. Height from the tip of tooth to the lower side of the crown wheel.

involute

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

version

  • Dativersion (String):

Notes

  • The Datipreview_mode property is set to true by default and when the gear is created you'll find this message in the report view:
    Gear module: Crown gear created, preview_mode = true for improved performance. Set preview_mode property to false when ready to cut teeth.
  • 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.
  • other_teeth: Several pinions with the same number of teeth only can be used on one crown wheel.
  • pressure_parameter: Only change the parameter, if sufficient knowledge of the gear geometry is available.
  • The geometry of the crown gear is primarily determined by the spur pinion geometry (other_teeth).
  • Create spur gear with Involute gear. The number of teeth must be identical to the parameter other_teeth of the crown gear.
  • Adjustments for optimal running characteristics can be made with the parameters of involute gear.

Crown and spur gear set overview

  • (1) Spur gear
  • (2) Crown gear
  • (3) Tooth width
  • (4) Inner diameter
  • (5) Outer diameter

Useful formulas

  • Inner diameter (4)
    • inner diamter = module (spur gear) * teeth (crown gear) * cos pressure_paramter (pinion) : cos pressure_parameter (crown gear)
  • Outer diameter (5)
    • outer diamter = inner diameter + 2x height (tooth width crown gear)