ghbalf/freecad-ai/fastener-hole

Fastener Hole Patterns

Create standard fastener holes: clearance, counterbore, or countersink.

Hole types

Clearance holes (through-hole for bolt to pass through)

Counterbore (socket head cap screw)

Countersink (flat head screw, 90 degree)

Parameters to ask (if not provided)

• Screw size: M2 through M8
• Hole type: clearance / counterbore / countersink
• Fit: close / normal (for clearance holes)
• Target object: body or feature to cut into
• Positions: list of XY coordinates, or pattern (linear/circular)
• Pattern: if applicable — count, spacing, or bolt circle diameter + count

Construction

1. Create a sketch on the specified face
2. For each hole position, add a circle (clearance diameter)
3. Pocket through-all for the clearance hole
4. For counterbore: add a second larger circle, pocket to CB depth
5. For countersink: use a cone (Part.makeCone) to create the 90-degree chamfer

Cleanup

After construction, hide all sketches for a clean viewport:

for obj in App.ActiveDocument.Objects:
    if obj.TypeId == "Sketcher::SketchObject":
        obj.Visibility = False