Assembly3 ConstraintPointsCoincident: Difference between revisions

From FreeCAD Documentation
(Correct name in GuiCommand. Icon with command name is missing. Minor stuff.)
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{{Docnav
{{Docnav
|[[Assembly3_ConstraintPerpendicular|Perpendicular]]
|[[Assembly3_ConstraintPerpendicular|Perpendicular]]
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{{GuiCommand
{{GuiCommand
|Name=Assembly3 ConstraintPointsCoincident
|Name=Assembly3 ConstraintPointsCoincident
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}}
}}


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


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This tool builds a link between two objects of an assembly and fixes the distance between them and the orientation to each other. The selected elements of each object or more precise their implicit coordinate systems (ICS) are used to position one object to another.
This tool builds a link between two objects of an assembly and fixes the distance between them and the orientation to each other. The selected elements of each object or more precise their implicit coordinate systems (ICS) are used to position one object to another.


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Assuming the first object is already locked in place by the [[Image:Assembly ConstraintLock.svg‎‎|24px]] [[Assembly3_ConstraintLock|Lock constraint]] then the following object is moved to a position where both ICSs' origins are in the same place.
Assuming the first object is already locked in place by the [[Image:Assembly ConstraintLock.svg‎‎|24px]] [[Assembly3_ConstraintLock|Lock constraint]] then the following object is moved to a position where both ICSs' origins are in the same place.


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Point elements have no stretch in any direction (zero length) and so there's no orientation detectable i.e. their ICS are only to match other elements' settings. The orientation of the ICSs always stays the same as the global coordinate system's orientation and can not be used to reduce any degrees of freedom related to rotation.
Point elements have no stretch in any direction (zero length) and so there's no orientation detectable i.e. their ICS are only to match other elements' settings. The orientation of the ICSs always stays the same as the global coordinate system's orientation and can not be used to reduce any degrees of freedom related to rotation.


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Related to the first object the following object can still spin around the origin (around all three axes). This is leaving 3 degrees of freedom (DOFs) for each link unconstrained.
Related to the first object the following object can still spin around the origin (around all three axes). This is leaving 3 degrees of freedom (DOFs) for each link unconstrained.


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


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# Place two objects into an assembly
# Place two objects into an assembly
# Select one point element of each object
# Select one point element of each object
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{{Docnav
{{Docnav
|[[Assembly3_ConstraintPerpendicular|Perpendicular]]
|[[Assembly3_ConstraintPerpendicular|Perpendicular]]

Revision as of 10:07, 10 May 2021

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Assembly3 ConstraintPointsCoincident

Menu location
None
Workbenches
Assembly3
Default shortcut
None
Introduced in version
-
See also
None

Description

This tool builds a link between two objects of an assembly and fixes the distance between them and the orientation to each other. The selected elements of each object or more precise their implicit coordinate systems (ICS) are used to position one object to another.

Assuming the first object is already locked in place by the Lock constraint then the following object is moved to a position where both ICSs' origins are in the same place.

Point elements have no stretch in any direction (zero length) and so there's no orientation detectable i.e. their ICS are only to match other elements' settings. The orientation of the ICSs always stays the same as the global coordinate system's orientation and can not be used to reduce any degrees of freedom related to rotation.

Related to the first object the following object can still spin around the origin (around all three axes). This is leaving 3 degrees of freedom (DOFs) for each link unconstrained.

Usage

  1. Place two objects into an assembly
  2. Select one point element of each object
  3. Press the Points coincident button.