SheetMetal Unfold: Difference between revisions

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<!--T:1-->
{{Docnav
{{Docnav
|[[SheetMetal_AddFoldWall|AddFoldWall]]
|
|[[SheetMetal_UnattendedUnfold|UnattendedUnfold]]
|
|[[SheetMetal_Workbench|SheetMetal Workbench]]
|[[SheetMetal_Workbench|SheetMetal Workbench]]
|IconL=
|IconL=SheetMetal_AddFoldWall.svg
|IconR=SheetMetal_UnattendedUnfold.svg
|IconC=Sheetmetal_workbench_icon.svg
|IconC=Sheetmetal_workbench_icon.svg
|IconR=
}}
}}


<!--T:2-->
{{GuiCommand
{{GuiCommand
|Name=SheetMetal Unfold
|Name=SheetMetal Unfold
|MenuLocation=SheetMetal → Unfold
|MenuLocation=SheetMetal → Unfold
|Workbenches=[[SheetMetal Workbench|SheetMetal]]
|Workbenches=[[SheetMetal_Workbench|SheetMetal]]
|Shortcut=None
|Shortcut={{KEY|U}}
|SeeAlso=[[SheetMetal_UnattendedUnfold|SheetMetal UnattendedUnfold]]
|Version=
|SeeAlso=
}}
}}


==Description==
==Description== <!--T:3-->


<!--T:4-->
The [[Image:SheetMetal_Unfold.svg|24px]] SheetMetal Unfold tool unfolds the metal sheet.
The [[Image:SheetMetal_Unfold.svg|24px]] '''SheetMetal Unfold''' command unfolds a sheet metal object.


==Usage== <!--T:5-->
:[[Image:Involute-Gear example.png]]
:{{Caption|From left to right: caption in here
}}


<!--T:6-->
==Usage==
# Select a planar face of the sheet metal part.
# Activate the [[Image:SheetMetal_Unfold.svg|16px]] [[SheetMetal_Unfold|Unfold]] command using one of the following:
#* The {{Button|[[Image: SheetMetal_Unfold.svg |16px]] [[SheetMetal_Unfold|Unfold]]}} button.
#* The {{MenuCommand|SheetMetal → [[Image:SheetMetal_Unfold.svg|16px]] [[SheetMetal_Unfold|Unfold]]}} menu option.
#* The keyboard shortcut: {{KEY|U}}.
# Adjust unfolding options in the [[Task_panel|task panel]] by:
#* Selecting the projection options of the unfold sketch.
#* Selecting the method of bend deduction with K-factor: <br> - Use a [https://github.com/shaise/FreeCAD_SheetMetal#material-definition-sheet Material Definition Sheet]. <br> - Select a manual [https://github.com/shaise/FreeCAD_SheetMetal#terminology K-factor] then the [https://de.wikipedia.org/wiki/Biegeverkürzung#Korrektur_durch_den_sog._k-Faktor ANSI or DIN] standard to apply


==Properties== <!--T:7-->
# Switch to the [[Image:Sheetmetal_workbench_icon.svg|22px]] [[SheetMetal Workbench]].
# Invoke the command several way:
#* Press the [[File:FCGear_InvoluteGear.svg|22px|link=FCGear InvoluteGear]] [[FCGear_InvoluteGear|Create an Involute gear]] button in the tool bar.
#* Using the {{MenuCommand|Gear Menu → Involute gear}}.
# Change the gear parameter to the required conditions (see {{Emphasis|Properties → Data}} below).


<!--T:29-->
==Properties==
See also: [[Property_editor|Property editor]].


<!--T:30-->
===Data===
A SheetMetal Unfold object is derived from a [[Part_Feature|Part Feature]] object and inherits all its properties. It has no additional properties, but its label has a default value:


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

<!--T:9-->
{{Properties_Title|Base}}
{{Properties_Title|Base}}


<!--T:10-->
* {{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|String}}: Default value: {{value|Unfold}} (+ a sequential number for second and following items). </br>The user editable name of this object, it may be any arbitrary UTF8 string.


==Limitations== <!--T:13-->
{{Properties_Title|computed}}


<!--T:14-->
* {{PropertyData|dw}}: Pitch diameter (not changeable, is calculated automatically).
* The sheet metal should have a constant thickness.
* Flat faces should not contain split lines.
* Flat faces must be truly planar and not B-spline approximations.
* Faces of bend angles must be truly cylindrical and also not B-spline approximations.
* The Unfold feature is not parametric. If the model is modified you have to unfold it again.


{{Properties_Title|gear_parameter}}


<!--T:15-->
* {{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_gear}}: {{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|numpoints}}: Default is 6, change of the involute profile. Changing the value can lead to unexpected results.
* {{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|shift}}: Default is 0,00, generates a positive and negative profile shift (see also the information in {{Emphasis|Notes}}).
* {{PropertyData|simple}}: {{Emphasis|True}} generates a simplified display (without teeth and only a cylinder in pitch diameter).
* {{PropertyData|teeth}}: Number of teeth (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}}).

{{Properties_Title|involute_parameter}}

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

{{Properties_Title|tolerance}}

* {{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}}).

=== View ===

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==

* {{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|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|shift}}: Profile shift is not merely used to prevent undercut. It can be used to adjust center distance between two gears. If a positive correction is applied, such as to prevent undercut in a pinion, the tooth thickness at top is thinner.
* {{Emphasis|teeth}}: If the number of teeth is changed, the pitch diameter also changes ({{Emphasis|dw}}).
* {{Emphasis|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. The undercut not only weakens the tooth with a wasp-like waist, but also removes some of the useful involute adjacent to the base circle.
* {{Emphasis|pressure_parameter}}: 20° is a standard value here. The pressure angle is defined as the angle between the line-of-action (common tangent to the base circles) and a perpendicular to the line-of-centers. Thus, for standard gears, 14.5° pressure angle gears have base circles much nearer to the roots of teeth than 20° gears. It is for this reason that 14.5° gears encounter greater undercutting problems than 20° gears. Important. the pressure angle changes with a profile shift. Only change the parameter, if sufficient knowledge of the gear geometry is available.
* {{Emphasis|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:
</translate>
{{Code|code=
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")
}}
<translate>
{{Docnav
{{Docnav
|[[SheetMetal_AddFoldWall|AddFoldWall]]
|
|[[SheetMetal_UnattendedUnfold|UnattendedUnfold]]
|
|[[SheetMetal_Workbench|SheetMetal Workbench]]
|[[SheetMetal_Workbench|SheetMetal Workbench]]
|IconL=
|IconL=SheetMetal_AddFoldWall.svg
|IconR=SheetMetal_UnattendedUnfold.svg
|IconC=Sheetmetal_workbench_icon.svg
|IconC=Sheetmetal_workbench_icon.svg
|IconR=
}}
}}

</translate>
</translate>
[[Category:Addons{{#translation:}}]]
[[Category:SheetMetal{{#translation:}}]]
[[Category:SheetMetal{{#translation:}}]]
[[Category:Addons{{#translation:}}]]
[[Category:External Command Reference{{#translation:}}]]
[[Category:External Command Reference{{#translation:}}]]

Latest revision as of 09:32, 14 October 2022

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SheetMetal Unfold

Menu location
SheetMetal → Unfold
Workbenches
SheetMetal
Default shortcut
U
Introduced in version
-
See also
SheetMetal UnattendedUnfold

Description

The SheetMetal Unfold command unfolds a sheet metal object.

Usage

  1. Select a planar face of the sheet metal part.
  2. Activate the Unfold command using one of the following:
    • The Unfold button.
    • The SheetMetal → Unfold menu option.
    • The keyboard shortcut: U.
  3. Adjust unfolding options in the task panel by:

Properties

See also: Property editor.

A SheetMetal Unfold object is derived from a Part Feature object and inherits all its properties. It has no additional properties, but its label has a default value:

Data

Base

  • DataLabel (String): Default value: Unfold (+ a sequential number for second and following items).
    The user editable name of this object, it may be any arbitrary UTF8 string.

Limitations

  • The sheet metal should have a constant thickness.
  • Flat faces should not contain split lines.
  • Flat faces must be truly planar and not B-spline approximations.
  • Faces of bend angles must be truly cylindrical and also not B-spline approximations.
  • The Unfold feature is not parametric. If the model is modified you have to unfold it again.