From FreeCAD Documentation
- There are several ways to invoke the tool:
- Press the Create arc slot button.
- Select the Sketcher → Sketcher geometries → Create arc slot option from the menu.
- The keyboard shortcut: G then S, then 2.
- The cursor changes to a cross with the tool icon.
- The Arc Slot parameters section is added at the top of the Sketcher Dialog.
- Optionally press the M key or select from the dropdown list in the parameters section to change the tool mode:
- Arc ends:
- Pick the center of the arc slot. Or with Pos-OVP: enter its X and/or Y coordinate.
- Pick the center of the first semicircle, this also defines the radius of the (virtual) centerline of the slot. Or with Dim-OVP: enter the radius and/or start angle of the slot. The angle is relative to the X axis of the sketch. No constraint is created for this angle.
- Pick the center of the second semicircle. Or with Dim-OVP: enter the aperture angle of the centerline arc.
- Pick a point to define the radius of the semicircles. Or with Dim-OVP: enter this radius.
- Flat ends:
- Pick the center of the arc slot. Or with Pos-OVP: enter its X and/or Y coordinate.
- Pick the start point of the first arc, this also defines its radius. Or with Dim-OVP: enter the radius and/or start angle of the first arc. The angle is relative to the X axis of the sketch. No constraint is created for this angle.
- Pick the end point of the first arc. Or with Dim-OVP: enter the aperture angle of the arc.
- Pick a point to define the width of the slot. Or with Dim-OVP: enter this width.
- 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.