Constraint Length.png Constraint Length

Menu location
Sketch → Sketcher constraints → Constrain distance
Workbenches
Sketcher, PartDesign
Default shortcut
None
See also
Constraint HorizontalDistance, Constraint VerticalDistance


Description

Constraint Length constrains the length of a line, the perpendicular distance between a point and a line or the distance between two points to have a specified value.

Hint

If applicable please consider using the Horizontal Distance or Vertical Distance constraints instead. These constraints are more robust and faster to calculate than the here documented length constraint.

Operation

Select a line in the sketch,
LengthConstraint1.png
by clicking on the line (it turns dark green).
LengthConstraint2.png
Apply the Length Constraint by selecting the icon Constraint Length.png from the Sketcher Constraints toolbar or selecting the Constrain distance menu item from the Sketcher Constraints sub-menu of the Sketcher menu item in the Sketcher workbench (or Part Design in the Part Design workbench).
LengthConstraint3.png
The length of the line is constrained to its current value.Double clicking on the constraint in the 3D view or in the Tasks tab of the Combo View will bring up a dialog box to allow the constraint value to be edited.
LengthConstraint4.png
Enter the required value and click OK to set the constraint length.
LengthConstraint5.png
The Length Constraint also constrains the distance between a line and a point.
LengthConstraint6.png
Select the line and a point in the sketch,
LengthConstraint7.png
then apply the constraint as before.
The perpendicular distance between the point and the line is constrained to its current value. this may be edited as described above to set the constraint to a desired value.
LengthConstraint8.png
The constraint may also be applied to two points, selected here at either end of a poly-line.
LengthConstraint9.png
Applying the constraint as before, the distance between the two selected points is constrained. As described above it may be edited to set a desired value.
LengthConstraint10.png


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