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=
}}
}}


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|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=[[SheetMetal UnfoldUpdate]]
}}
}}


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


<!--T:4-->
<!--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.


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


==Usage== <!--T:6-->
<!--T:6-->
To unfold a sheet metal part:
# Switch to the [[Image:Sheetmetal_workbench_icon.svg|22px]] [[SheetMetal_Workbench|SheetMetal Workbench]].
# Select a flat face of the sheet metal part. {{Emphasis|Note}}:the face should be a plane, the thickness should be constant
# Click on the [[Image:SheetMetal_Unfold.svg|24px]] '''Unfold''' tool to display a menu in task panel to manage unfolding options.
# Select projection options of future flattened sketch
# Select the rule for bend deduction with [https://github.com/shaise/FreeCAD_SheetMetal#terminology Kfactor]:
#* Use [https://github.com/shaise/FreeCAD_SheetMetal#material-definition-sheet Material Definition Sheet]
#* Or select a manual [https://github.com/shaise/FreeCAD_SheetMetal#terminology Kfactor] then the ANSI or DIN standard to apply


<!--T:7-->
==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).


==Properties== <!--T:8-->
<!--T:29-->
See also: [[Property_editor|Property editor]].


===Data=== <!--T:9-->
<!--T:30-->
This tool creates an Unfold object and has no representation of its own in the [[Tree_view|Tree view]] or elsewhere and so has no properties.


<!--T:10-->
<!--T:31-->
The '''Unfold''' object, on the other hand, 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:11-->
<!--T:10-->
* {{PropertyData|Placement}}: [[Placement|Placement]] is the location and orientation of an object in space.
* {{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.
* {{PropertyData|Label}}: User name of the object in the [[Tree_view|Tree view]].


<!--T:12-->
==Limitations== <!--T:13-->
{{Properties_Title|computed}}

<!--T:13-->
* {{PropertyData|dw}}: Pitch diameter (not changeable, is calculated automatically).


<!--T:14-->
<!--T:14-->
* Sheet metal should have constant thickness
{{Properties_Title|gear_parameter}}
* Flat faces should be planar with no split lines
* Bend angles should be radius with cylindrical faces
* Unfold feature is not parametric at the moment.



<!--T:15-->
<!--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}}).

<!--T:16-->
{{Properties_Title|involute_parameter}}

<!--T:17-->
* {{PropertyData|pressure_parameter}}: Default is 20 (see also the information in {{Emphasis|Notes}}).

<!--T:18-->
{{Properties_Title|tolerance}}

<!--T:19-->
* {{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 === <!--T:20-->

<!--T:21-->
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== <!--T:22-->

<!--T:23-->
* {{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== <!--T:24-->

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

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

<!--T:27-->
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>
<!--T:28-->
{{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:}}]]

Revision as of 10:11, 29 August 2021

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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

To unfold a sheet metal part:

  1. Switch to the SheetMetal Workbench.
  2. Select a flat face of the sheet metal part. Note:the face should be a plane, the thickness should be constant
  3. Click on the Unfold tool to display a menu in task panel to manage unfolding options.
  4. Select projection options of future flattened sketch
  5. Select the rule for bend deduction with Kfactor:

Properties

See also: Property editor.

This tool creates an Unfold object and has no representation of its own in the Tree view or elsewhere and so has no properties.

The Unfold object, on the other hand, 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

  • Sheet metal should have constant thickness
  • Flat faces should be planar with no split lines
  • Bend angles should be radius with cylindrical faces
  • Unfold feature is not parametric at the moment.