Assembly3 ConstraintPointOnLine: Difference between revisions

From FreeCAD Documentation
mNo edit summary
(Marked this version for translation)
 
Line 3: Line 3:
<translate>
<translate>


<!--T:1-->
{{Docnav
{{Docnav
|[[Assembly3_ConstraintPointInPlane|Point on plane]]
|[[Assembly3_ConstraintPointInPlane|Point on plane]]
Line 12: Line 13:
}}
}}


<!--T:2-->
{{GuiCommand
{{GuiCommand
|Name=Assembly3 ConstraintPointOnLine
|Name=Assembly3 ConstraintPointOnLine
Line 18: Line 20:
}}
}}


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


<!--T:4-->
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 precisely 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 precisely their implicit coordinate systems (ICS) are used to position one object to another.


<!--T:5-->
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 the point elements's origin lies on the line element's z-axis.
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 the point elements's origin lies on the line element's z-axis.


<!--T:6-->
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.
Straight elements have an origin and a direction which is represented by the ICS's z-axis. A direction of the x- and y-axis is not detectable and so rotation around the z-axis can not be used to reduce DOFs. (It doesn't apply in combination with point elements anyway...)
Straight elements have an origin and a direction which is represented by the ICS's z-axis. A direction of the x- and y-axis is not detectable and so rotation around the z-axis can not be used to reduce DOFs. (It doesn't apply in combination with point elements anyway...)


<!--T:7-->
Related to the first object the following object can still move along the z-axis and spin around all three axes. This is leaving 4 degrees of freedom (DOFs) for each link unconstrained.
Related to the first object the following object can still move along the z-axis and spin around all three axes. This is leaving 4 degrees of freedom (DOFs) for each link unconstrained.


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


<!--T:9-->
# Place two objects into an assembly.
# Place two objects into an assembly.
# Select one point element of one object and one straight edge element of the other object.
# Select one point element of one object and one straight edge element of the other object.
Line 36: Line 43:


<!--T:10-->
{{Docnav
{{Docnav
|[[Assembly3_ConstraintPointInPlane|Point on plane]]
|[[Assembly3_ConstraintPointInPlane|Point on plane]]

Latest revision as of 10:32, 10 May 2021

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

GuiCommand model explains how commands should be documented. Browse Category:UnfinishedDocu to see more incomplete pages like this one. See Category:Command Reference for all commands.

See WikiPages to learn about editing the wiki pages, and go to Help FreeCAD to learn about other ways in which you can contribute.

Other languages:

Assembly3 ConstraintPointOnLine

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 precisely 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 the point elements's origin lies on the line element's z-axis.

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. Straight elements have an origin and a direction which is represented by the ICS's z-axis. A direction of the x- and y-axis is not detectable and so rotation around the z-axis can not be used to reduce DOFs. (It doesn't apply in combination with point elements anyway...)

Related to the first object the following object can still move along the z-axis and spin around all three axes. This is leaving 4 degrees of freedom (DOFs) for each link unconstrained.

Usage

  1. Place two objects into an assembly.
  2. Select one point element of one object and one straight edge element of the other object.
  3. Press the Point on line button.