SheetMetal AddJunction: Difference between revisions

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<!--T:1-->
{{Docnav
{{Docnav
|[[SheetMetal_AddRelief|AddRelief]]
|
|[[SheetMetal_AddBend|AddBend]]
|
|[[SheetMetal_Workbench|SheetMetal Workbench]]
|[[SheetMetal_Workbench|SheetMetal Workbench]]
|IconL=
|IconL=SheetMetal_AddRelief.svg
|IconR=SheetMetal_AddBend.svg
|IconC=Sheetmetal_workbench_icon.svg
|IconC=Sheetmetal_workbench_icon.svg
|IconR=
}}
}}


<!--T:2-->
{{GuiCommand
{{GuiCommand
|Name=SheetMetal Junction
|Name=SheetMetal AddJunction
|MenuLocation=SheetMetal → Junction
|MenuLocation=SheetMetal → Make Junction
|Workbenches=[[SheetMetal Workbench|SheetMetal]]
|Workbenches=[[SheetMetal_Workbench|SheetMetal]]
|Shortcut=None
|Shortcut={{KEY|S}} {{KEY|J}}
|SeeAlso=[[SheetMetal_AddRelief|SheetMetal AddRelief]], [[SheetMetal_AddBend|SheetMetal AddBend]]
|Version=
|SeeAlso=
}}
}}


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


<!--T:4-->
The [[Image:SheetMetal Junction.svg|24px]] SheetMetal Junction tool.
The [[Image:SheetMetal_AddJunction.svg|24px]] [[SheetMetal_AddJunction|SheetMetal AddJunction]] command creates open junctions between two sections (walls/flanges) of a sheet metal object. Without these junctions sheet metal sections connected to the same base will not be unfoldable.


<!--T:25-->
:[[File:PostGap.png|320]]
This command is the second of three steps to convert a shell object made with the [[Part_Workbench|Part Workbench]] or [[PartDesign_Workbench|PartDesign Workbench]] into an unfoldable sheet metal object:
:{{Caption|Junction applied to corner.
# [[SheetMetal_AddRelief|SheetMetal AddRelief]]
}}
# [[SheetMetal_AddJunction|SheetMetal AddJunction]]
# [[SheetMetal_AddBend|SheetMetal AddBend]]


</translate>
==Usage==
[[Image:SheetMetal_ConvertShellObject-01.png|100px|link=]] [[Image:Button_right.svg|16px|link=]]
To add junction to corner of corner:
[[Image:SheetMetal_ConvertShellObject-02.png|100px|link=SheetMetal_AddRelief]] [[Image:Button_right.svg|16px|link=]]
# Start with a base plate or sheet, select a corner vertex to apply relief
[[Image:SheetMetal_ConvertShellObject-03.png|200px|link=SheetMetal_AddJunction]] [[Image:Button_right.svg|16px|link=]]
# Click on the [[Image:SheetMetal Junction.svg|24px]] '''Junction''' tool to add a junction cut to corner.
[[Image:SheetMetal_ConvertShellObject-04.png|100px|link=SheetMetal_AddBend]]
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<!--T:5-->
{{Caption|Make Junction - cut edges open}}


<!--T:12-->
==Usage== <!--T:6-->
{{Emphasis|Note}}: The workbench does not have a tool to create a base plate, so you need to start your model with one of the following methods:
:* Method 1: [[File:Part_Box.svg|24px]] [[Part Box|Part Cube]]
:* Method 2: An extruded solid made with [[File:Part_Extrude.svg|24px]] [[Part Extrude]] from either a:
::* [[File:Draft_Rectangle.svg|24px]] [[Draft Rectangle]] or a
::* [[File:Draft_Wire.svg|24px]] [[Draft Wire]] or a
::* [[File:Sketcher_NewSketch.svg|24px]] [[Sketcher NewSketch|Sketch]]
::* Use [[Image:Part_Thickness.svg|24px]] [[Part Thickness]] to create shell ({{Emphasis|Typically with the thickness value of the sheet metal.}})
:* Method 3: [[File:PartDesign_Body.svg|24px]] [[PartDesign Body]] containing either an
::* [[File:PartDesign_AdditiveBox.svg|24px]] [[PartDesign AdditiveBox|additive box]] or a
::* [[File:PartDesign_Pad.svg|24px]] [[PartDesign Pad]] made from a [[File:Sketcher_NewSketch.svg|24px]] [[Sketcher NewSketch|Sketch]].
::* Use [[File:PartDesign Thickness.svg|24px]] [[PartDesign Thickness]] to create shell ({{Emphasis|Typically with the thickness value of the sheet metal.}})
::If you start with a [[File:PartDesign_Body.svg|24px]] PartDesign Body, you can mix Sheet Metal features with PartDesign features such as [[File:PartDesign_Pocket.svg|24px]] [[PartDesign Pocket|pockets]] or [[File:PartDesign_Hole.svg|24px]] [[PartDesign Hole|holes]].


<!--T:7-->
==Properties==
# Select one or more edge(s).
# Activate the [[Image:SheetMetal_AddJunction.svg|16px]] '''SheetMetal AddJunction''' command using one of the following:
#* The {{Button|[[Image:SheetMetal_AddJunction.svg|16px]] [[SheetMetal_AddJunction|SheetMetal AddJunction]]}} button.
#* The {{MenuCommand|SheetMetal → [[Image:SheetMetal_AddJunction.svg|16px]] Make Junction}} menu option.
#* The keyboard shortcut: {{KEY|S}} then {{KEY|J}}.


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===Data===
[[Image:SheetMetal_ConvertShellObject-06.png|200px|link=]] [[Image:Button_right.svg|16px|link=]]
[[Image:SheetMetal_ConvertShellObject-07.png|200px|link=]]
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== Notes == <!--T:26-->
{{Properties_Title|Base}}


<!--T:8-->
* {{PropertyData|Label}}: User name of the object in the [[Tree_view|Tree view]].
The commands [[Image:SheetMetal_AddRelief.svg|16px]] '''[[SheetMetal_AddRelief|SheetMetal AddRelief]]''', [[Image:SheetMetal_AddJunction.svg|16px]] '''[[SheetMetal_AddJunction|SheetMetal AddJunction]]''', and [[Image:SheetMetal_AddBend.svg|16px]] '''[[SheetMetal_AddBend|SheetMetal AddBend]]''' work best with hollow cuboids i.e. shell objects with a constant thickness and only 90° angles between faces.


<!--T:9-->
{{Properties_Title|Parameters}}
See [[SheetMetal_AddRelief#Notes|SheetMetal AddRelief]] for hints about creating shell objects of cuboids.


==Properties== <!--T:10-->
* {{PropertyData|gap}}: Size of gap to be added.


<!--T:23-->
See also: [[Property_editor|Property editor]].


<!--T:24-->
=== View ===
A SheetMetal Junction object is derived from a [[Part_Feature|Part Feature]] object and inherits all its properties. It also has the following additional properties and its label has a default value:


===Data=== <!--T:11-->
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==

==Limitations==

Limitation are not known yet.

==Scripting==

==Usage==
To Extend the face:
# Start with a base plate or sheet, select a thin face representing the thickness of the metal sheet
# Click on the [[Image:SheetMetal_Extrude.svg|24px]] '''Extrude''' tool to extend the face.


<!--T:12-->
<!--T:12-->
{{Emphasis|Note}}: The workbench does not have a tool to create a base plate, so you need to start your model with one of the following methods:
:* Method 1: [[File:Part_Box.svg|24px]] [[Part Box|Part Cube]]
:* Method 2: An extruded solid made with [[File:Part_Extrude.svg|24px]] [[Part Extrude]] from either a:
::* [[File:Draft_Rectangle.svg|24px]] [[Draft Rectangle]] or a
::* [[File:Draft_Wire.svg|24px]] [[Draft Wire]] or a
::* [[File:Sketcher_NewSketch.svg|24px]] [[Sketcher NewSketch|Sketch]]
:* Method 3: [[File:PartDesign_Body.svg|24px]] [[PartDesign Body]] containing either an
::* [[File:PartDesign_AdditiveBox.svg|24px]] [[PartDesign AdditiveBox|additive box]] or a
::* [[File:PartDesign_Pad.svg|24px]] [[PartDesign Pad]] made from a [[File:Sketcher_NewSketch.svg|24px]] [[Sketcher NewSketch|Sketch]].
::If you start with a [[File:PartDesign_Body.svg|24px]] PartDesign Body, you can mix Sheet Metal features with PartDesign features such as [[File:PartDesign_Pocket.svg|24px]] [[PartDesign Pocket|pockets]] or [[File:PartDesign_Hole.svg|24px]] [[PartDesign Hole|holes]].

<!--T:50-->
{{Emphasis|Note}}: In an extension operation, set {{incode|Refine {{:=}} true}}.

==Properties==

===Data===

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


<!--T:13-->
* {{PropertyData|angle}}: Bend angle.
* {{PropertyData|Label|String}}: Default value: {{value|Junction}} (+ a sequential number for second and following items). </br>The user editable name of this object, it may be any arbitrary UTF8 string.
* {{PropertyData|extend1}}: Extends the wall on the left side.
* {{PropertyData|extend2}}: Extends the wall on the right side.
* {{PropertyData|Base Feature|Link|hidden}}: Base Feature. Link to the parent feature.
* {{PropertyData|gap1}}: Gap from the left side.
* {{PropertyData|_Body|LinkHidden|hidden}}: Hidden link to the parent body.
* {{PropertyData|gap2}}: Gap from the right side.
* {{PropertyData|invert}}: Invert bend direction.
* {{PropertyData|length}}: Length of the wall.
* {{PropertyData|miterangle1}}: Bend miter angle on the left side.
* {{PropertyData|miterangle2}}: Bend miter angle on the right side.
* {{PropertyData|radius}}: Bend radius.
* {{PropertyData|relief Type}}: Rectangle or Round. Enabled only when a gap value is set.
* {{PropertyData|reliefd}}: Relief depth. Enabled only when a gap value is set.
* {{PropertyData|reliefw}}: Relief width. Enabled only when a gap value is set.
* {{PropertyData|kfactor}}: K factor (also known as neutral factor) for the bend. Used to calculate bend allowance when unfolding.
* {{PropertyData|unfold}}: False (default) or True. If true, unfolds the bend.


<!--T:14-->
{{Properties_Title|computed}}
{{Properties_Title|Parameters}}


<!--T:15-->
* {{PropertyData|dw}}: Pitch diameter (not changeable, is calculated automatically).
* {{PropertyData|base Object|LinkSub}}: "Base Object". Links to the edges defining gap/junction positions.
* {{PropertyData|gap|Length}}: "Junction Gap". Default: {{value|2,00 mm}}.Size of gap/junction to be added.


{{Properties_Title|gear_parameter}}


<!--T:22-->
* {{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_AddRelief|AddRelief]]
|
|[[SheetMetal_AddBend|AddBend]]
|
|[[SheetMetal_Workbench|SheetMetal Workbench]]
|[[SheetMetal_Workbench|SheetMetal Workbench]]
|IconL=
|IconL=SheetMetal_AddRelief.svg
|IconR=SheetMetal_AddBend.svg
|IconC=Sheetmetal_workbench_icon.svg
|IconC=Sheetmetal_workbench_icon.svg
|IconR=
}}
}}

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</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 12:32, 3 October 2021

This documentation is not finished. Please help and contribute documentation.

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SheetMetal AddJunction

Menu location
SheetMetal → Make Junction
Workbenches
SheetMetal
Default shortcut
S J
Introduced in version
-
See also
SheetMetal AddRelief, SheetMetal AddBend

Description

The SheetMetal AddJunction command creates open junctions between two sections (walls/flanges) of a sheet metal object. Without these junctions sheet metal sections connected to the same base will not be unfoldable.

This command is the second of three steps to convert a shell object made with the Part Workbench or PartDesign Workbench into an unfoldable sheet metal object:

  1. SheetMetal AddRelief
  2. SheetMetal AddJunction
  3. SheetMetal AddBend

Make Junction - cut edges open

Usage

  1. Select one or more edge(s).
  2. Activate the SheetMetal AddJunction command using one of the following:
    • The SheetMetal AddJunction button.
    • The SheetMetal → Make Junction menu option.
    • The keyboard shortcut: S then J.

Notes

The commands SheetMetal AddRelief, SheetMetal AddJunction, and SheetMetal AddBend work best with hollow cuboids i.e. shell objects with a constant thickness and only 90° angles between faces.

See SheetMetal AddRelief for hints about creating shell objects of cuboids.

Properties

See also: Property editor.

A SheetMetal Junction object is derived from a Part Feature object and inherits all its properties. It also has the following additional properties and its label has a default value:

Data

Base

  • DataLabel (String): Default value: Junction (+ a sequential number for second and following items).
    The user editable name of this object, it may be any arbitrary UTF8 string.
  • Data (hidden)Base Feature (Link): Base Feature. Link to the parent feature.
  • Data (hidden)_Body (LinkHidden): Hidden link to the parent body.

Parameters

  • Database Object (LinkSub): "Base Object". Links to the edges defining gap/junction positions.
  • Datagap (Length): "Junction Gap". Default: 2,00 mm.Size of gap/junction to be added.


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