Difference between revisions of "Sketcher External"

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{{Docnav|[[Sketcher_Extend|Extend]]|[[Sketcher_CarbonCopy|CarbonCopy]]|[[Sketcher_Workbench|Sketcher]]|IconL=Sketcher_Extend.svg|IconC=Workbench_Sketcher.svg|IconR=Sketcher_CarbonCopy.svg}}
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{{GuiCommand|Name=Sketcher_External|Workbenches=[[Sketcher Workbench|Sketcher]], [[PartDesign Workbench|PartDesign]]|Shortcut=E|MenuLocation=Sketch → Sketcher geometries → Sketcher External|SeeAlso=[[Sketcher_ConstructionMode|ConstructionMode]]}}
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{{GuiCommand
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|Name=Sketcher External
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|Workbenches=[[Sketcher Workbench|Sketcher]]
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|Shortcut=X|MenuLocation=Sketch → Sketcher geometries → Sketcher External
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|SeeAlso=[[Sketcher_ToggleConstruction|ConstructionMode]]
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}}
  
 
==Description== <!--T:2-->
 
==Description== <!--T:2-->
  
 
<!--T:3-->
 
<!--T:3-->
This tool pulls solid line geometry into your current sketch. Once these lines are pulled in, they will appear as magenta lines in the current sketch, and you can constrain and dimension sketch curves to them.
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Use the '''Sketcher External Geometry''' tool when you need to apply a constraint between sketch geometry and something outside of the sketch. It works by inserting a linked construction geometry into the sketch. The default colour of externally linked edges is magenta. As with standard non-linked construction geometry (blue), the externally linked geometry is only visible when the sketch is in edit mode and is not directly used in the subsequent result from use of the sketch in another tool. Both types of construction geometry may be used as a reference for constraints within the sketch.
  
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This is useful because it lets you constrain you sketch back to nearby solid edges.
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[[FILE:Sketcher_ExternalEsempio1.png]]
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==How to use== <!--T:8-->
You can ONLY pull in lines and edges that are on the same plane as the sketch plane.
 
Only solid lines/edges can be pulled into the sketch, NOT 2D sketches or draft lines.
 
  
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<!--T:42-->
[[FILE:Sketcher_ExternalEsempio1.png]]
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* Create a new sketch, or open an existing sketch.
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* Click 'Sketcher External' button
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* Select an edge or a vertex that you want to link to in the sketch.
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* Press Esc, or select another tool to stop importing geometry into the sketch.
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=== Selection rules === <!--T:30-->
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Selection rules for what objects can be imported differ drastically between FC v0.16 and FC v0.17.
  
==Use== <!--T:8-->
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==== v0.17 ==== <!--T:31-->
* Start a sketch on face of a solid (Click on the solid face, then click the create sketch button)
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* Only edges and vertices from objects from same coordinate system are allowed.
* Click the 'Sketcher External' button
 
* Select, select the solid line that you want to pull into the sketch (remember this must be on the same plane that the sketch is on)
 
  
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That is, the sketch and the object must be in same Body, or in same Part, or both outside of any Parts and Bodies.
  
===How to Tell If It Worked ===
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<!--T:33-->
If the line is successfully pulled in it will have a magenta color. If it was not pulled in, it will remain green.
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For example, If the open sketch is in Body, you can use another sketch from Body as external geometry, but you can't use a sketch from Body001, or an edge from a Part Cube in the root of the project. Use Shapebinder feature to bring in a copy of the object into the coordinate system of open sketch. Then you will be able to use edges/vertices of Shapebinder object.  
  
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<!--T:34-->
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* No circular dependencies are allowed.
  
===Similarity to Construction Lines===
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<!--T:35-->
External geometry magenta lines can be used like [[Sketcher_ConstructionMode|Contruction lines]].
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That means, you can't link to Pocket made with this sketch. You can't link to any object that depends on the sketch.
Construction lines are lines that are internal to the sketch and will be used for constructing geometry only, and not for later solid operations, like extrusions.
 
  
External geometry magenta lines can be used as construction lines too, because they will not appear as sketch lines once you exit the sketch. But remember the external geometry magenta lines are parametrically linked back to a solid face.
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<!--T:36-->
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Unlike in v0.16, sketch doesn't have to be on any face in order to use this tool. Links directly between sketches are possible, and encouraged, as they are more reliable.
  
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==== v0.16 and older ==== <!--T:37-->
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* You can only link to edges/vertices of the shape the sketch is mapped to.
  
===Two Main Uses Of External Lines===
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<!--T:38-->
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For example. If Sketch was made on a face of Pad, you can only use edges/vertices of Pad. You can't use edges of Sketch that was used to make Pad. You can't use edges of Pad that are inherited onto a Pocket done with this sketch (you need to hide Pocket and unhide Pad to link new stuff in).
  
There are two scenarios where you'll want to use this tool.
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<!--T:39-->
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The sketch MUST be mapped to a face in order to use this tool.
  
* Option 1: You want to add holes or extrudes(pads) to the current solid that you're sketching on
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===Appearance When Successfully Linked === <!--T:15-->
* Option 2: You want to create tool bodies that are separate from your original solid
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A (default magenta) coloured line will be overlaid when an edge is successfully linked (the vertices will be red), and will be visible in your sketch only while your sketch is in edit mode.
  
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===Similarity to Construction Lines=== <!--T:16-->
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External geometry (default colour magenta) lines are similar (default colour blue) [[Sketcher_ToggleConstruction|Contruction lines]] except in that the external geometry magenta lines are parametrically linked back to an element of the solid to which the sketch is mapped.
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Construction geometry are lines that are internal to the sketch, are only visible when the sketch is in edit mode and will be used for constraint references only, and not directly for later solid operations, like Pad or Pocket.
  
Option 1 is the simplest option. If you want a hole at a specific location in an object, this method should be used.
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===Use Of External Geometry in a PartDesign Workbench Work Flow=== <!--T:18-->
  
Option 2 must sometimes be used. If I need to subtract away multiple cutting bodies then I need those bodies to be separate from my original solid. In that case I will need to extrude my sketch to make a new separate solid, then use clone or rotate or array to make a bunch of parametric copies of it.
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<!--T:19-->
:If I'm working with sketches, only individual sketches can be extruded or padded.
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In the PartDesign workbench work flow, the External Geometry tool is used to assist in the positioning of an aspect of the solid you are constructing, relative to the previous stage in its construction. PartDesign workbench is intended to produce one single solid, therefore these sketches with external geometry are used to create a new feature of that one single solid.
:Extruding will create a new solid body.
 
: Padding or using the pocket tool will NOT. They will use the sketch to alter your original solid.
 
  
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The external geometry can, for example, be used as a reference for a constraint being used to position a hole in an object at a specific location relative to an edge or vertex.
  
*Option 1 use pad or pocket to alter your solid, adding metal or making holes.
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===Use Of External Geometry in a Part Workbench Work Flow=== <!--T:24-->
*Option 2, use extrude to make your tool solid, then duplicate it with the above methods, and add or subtract it from your original solid.
 
  
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<!--T:40-->
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You can use any Part geometry that is in coordinate system of the sketch. It is advised to link to the earliest feature possible, as it forms a more stable link.
  
===Sneaky Usage, Dimension One Sketch Off Of Another===
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<!--T:41-->
One can use this to dimension one sketch off of another using the following order of operations:
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In v0.16 and older, the sketch must be mapped to a face to use this tool. Since v0.17, this limitation was lifted.
#Make sketch#1
 
#Pad or extrude it to make a solid, solid#1
 
#Make sketch#2 on the same plane as sketch#1
 
#Pull in solid#1 lines into sketch#2
 
#Pad or extrude sketch#2 to make solid#2
 
#Optional, hide solid#1
 
  
 
==Example== <!--T:11-->
 
==Example== <!--T:11-->
  
 
<!--T:12-->
 
<!--T:12-->
The magenta lines are External Geometry selected on two objects of the same extrusion products with previous sketch.
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This, below, is a sketch mapped to the top face of a solid created from a Pad of a previous sketch. The magenta lines are External Geometry linked to two edges of this pre-existing Pad.
In this case they are used to create the constraints of tangency with the circumferences.
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The line on the smaller rectangle is not used.
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In this case they are used as a reference for tangency constraints with the circumferences of one circle. They are also used as the reference for a horizontal and a vertical constraint to locate the centre of the second circle relative to the end and top of the Pad.
 
   
 
   
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[[FILE:Sketcher_ExternalEsempio2.png]]
 
[[FILE:Sketcher_ExternalEsempio2.png]]
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The active sketch with the basic forms hidden and external geometries visible.  
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This is the same sketch in edit mode, with the Pad upon which it is mapped hidden.  
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[[FILE:Sketcher_ExternalEsempio4.png]]
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[[FILE:Sketcher_ExternalEsempio4.png]]
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When the sketch edit mode is closed, external Geometry lines are not visible.
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When the sketch is closed, External Geometry lines are not visible.
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[[FILE:Sketcher_ExternalEsempio3.png]]
 
[[FILE:Sketcher_ExternalEsempio3.png]]
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<languages/>
 

Latest revision as of 13:00, 19 February 2019

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Sketcher External.svg Sketcher External

Menu location
Sketch → Sketcher geometries → Sketcher External
Workbenches
Sketcher
Default shortcut
X
Introduced in version
-
See also
ConstructionMode


Description

Use the Sketcher External Geometry tool when you need to apply a constraint between sketch geometry and something outside of the sketch. It works by inserting a linked construction geometry into the sketch. The default colour of externally linked edges is magenta. As with standard non-linked construction geometry (blue), the externally linked geometry is only visible when the sketch is in edit mode and is not directly used in the subsequent result from use of the sketch in another tool. Both types of construction geometry may be used as a reference for constraints within the sketch.

Sketcher ExternalEsempio1.png

How to use

  • Create a new sketch, or open an existing sketch.
  • Click 'Sketcher External' button
  • Select an edge or a vertex that you want to link to in the sketch.
  • Press Esc, or select another tool to stop importing geometry into the sketch.

Selection rules

Selection rules for what objects can be imported differ drastically between FC v0.16 and FC v0.17.

v0.17

  • Only edges and vertices from objects from same coordinate system are allowed.

That is, the sketch and the object must be in same Body, or in same Part, or both outside of any Parts and Bodies.

For example, If the open sketch is in Body, you can use another sketch from Body as external geometry, but you can't use a sketch from Body001, or an edge from a Part Cube in the root of the project. Use Shapebinder feature to bring in a copy of the object into the coordinate system of open sketch. Then you will be able to use edges/vertices of Shapebinder object.

  • No circular dependencies are allowed.

That means, you can't link to Pocket made with this sketch. You can't link to any object that depends on the sketch.

Unlike in v0.16, sketch doesn't have to be on any face in order to use this tool. Links directly between sketches are possible, and encouraged, as they are more reliable.

v0.16 and older

  • You can only link to edges/vertices of the shape the sketch is mapped to.

For example. If Sketch was made on a face of Pad, you can only use edges/vertices of Pad. You can't use edges of Sketch that was used to make Pad. You can't use edges of Pad that are inherited onto a Pocket done with this sketch (you need to hide Pocket and unhide Pad to link new stuff in).

The sketch MUST be mapped to a face in order to use this tool.

Appearance When Successfully Linked

A (default magenta) coloured line will be overlaid when an edge is successfully linked (the vertices will be red), and will be visible in your sketch only while your sketch is in edit mode.

Similarity to Construction Lines

External geometry (default colour magenta) lines are similar (default colour blue) Contruction lines except in that the external geometry magenta lines are parametrically linked back to an element of the solid to which the sketch is mapped. Construction geometry are lines that are internal to the sketch, are only visible when the sketch is in edit mode and will be used for constraint references only, and not directly for later solid operations, like Pad or Pocket.

Use Of External Geometry in a PartDesign Workbench Work Flow

In the PartDesign workbench work flow, the External Geometry tool is used to assist in the positioning of an aspect of the solid you are constructing, relative to the previous stage in its construction. PartDesign workbench is intended to produce one single solid, therefore these sketches with external geometry are used to create a new feature of that one single solid.

The external geometry can, for example, be used as a reference for a constraint being used to position a hole in an object at a specific location relative to an edge or vertex.

Use Of External Geometry in a Part Workbench Work Flow

You can use any Part geometry that is in coordinate system of the sketch. It is advised to link to the earliest feature possible, as it forms a more stable link.

In v0.16 and older, the sketch must be mapped to a face to use this tool. Since v0.17, this limitation was lifted.

Example

This, below, is a sketch mapped to the top face of a solid created from a Pad of a previous sketch. The magenta lines are External Geometry linked to two edges of this pre-existing Pad.

In this case they are used as a reference for tangency constraints with the circumferences of one circle. They are also used as the reference for a horizontal and a vertical constraint to locate the centre of the second circle relative to the end and top of the Pad.

Sketcher ExternalEsempio2.png

This is the same sketch in edit mode, with the Pad upon which it is mapped hidden.

Sketcher ExternalEsempio4.png

When the sketch edit mode is closed, external Geometry lines are not visible.

Sketcher ExternalEsempio3.png

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