FreeCAD: Constraints - Types

[last updated: 2020-12-01]
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Some of the possible constraints:
• Horizontal and Vertical (orientation):
  Select the body of the line, then select the constraint icon.
  Or you can select the icon first, then the line.
• Horizontal and Vertical (length):
  Select the body of the line
  After selecting the length constraint from the menu, you'll be prompted to enter desired length.
  Or you can select the constraint icon first, then the body of the line.
• Radius:
  Select the circle, then the constraint icon, then enter your desired radius in the box that is displayed.
• Coincident:
  Select two points that you want to be at the same place. They should turn dark green when you select them. Click the constraint icon.
  One or the other of them should move to be at the same place as the other. It may happen that they do not move. This can be because you have already constrained both points, and FC will refuse to "over-constrain" them. But it can also happen due to some kind of glitch. If you've applied the coincident constraint, and they haven't moved, click and hold on one of the lines, and attempt to move it. It may instantly jump to now be coincident with the other line.
• [put a node onto another entity]
• Mid-point:
  If you have a line, and you have a node, eg. an endpoint of another line, somewhere on or off your original line, and you want to fix the node to be at the mid-point of your original line:
  Click one endpoint of your line, click the node, click the other endpoint of your line, click the mid-point constraint icon.

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