From FreeCAD Documentation
- There are several ways to invoke the tool:
- Press the Create slot button.
- Select the Sketcher → Sketcher geometries → Create Slot option from the menu.
- The keyboard shortcut: G then S.
- The cursor changes to a cross with the tool icon.
- Pick the center of the first semicircle. Or with Pos-OVP: enter its X and/or Y coordinate.
- Pick the center of the second semicircle. Or with Dim-OVP: enter the distance between the centers and/or angle of the slot. The angle is relative to the X axis of the sketch.
- Pick a point to define the radius of the slot. Or with Dim-OVP: enter this radius.
- The slot is created and applicable Pos-OVP and Dim-OVP based constraints are added.
- If the tool runs in continue mode:
- Optionally keep creating slots.
- To finish, right-click or press Esc, or start another geometry or constraint creation tool.