c-shape-solid

// C-Shape Solid (Abstract Geometry Demo)
// This is a simplified geometry study that demonstrates how to create a "C" shape by subtracting a rectangular wedge from a circular ring. This base logic is foundational to models like split washers and other circular parts with a gap.




@settings(defaultLengthUnit = mm)

// ──────────
// PARAMETERS
// ──────────

// Outer diameter of the ring
ringOuterDiameter = 20

// Inner diameter — defines the hole in the middle of the ring
ringInnerDiameter = 10

// Thickness of the ring (height in Z direction)
ringThickness = 2

// Width of the wedge we will use to cut the split
cutGapWidth = 2

// ───────────────────────
// STEP 1: CREATE THE RING
// ───────────────────────

// We begin by sketching two concentric circles: the outer boundary and the hole. Then we subtract the inner one to get a donut-like profile.
ringSketch = startSketchOn(XY)
ringProfile = circle(ringSketch, center = [0, 0], diameter = ringOuterDiameter)
  |> subtract2d(tool = [
       circle(center = [0, 0], diameter = ringInnerDiameter)
     ])

// We extrude this sketch into a 3D solid. This is the full ring, with no gap yet.
solidRing = extrude(ringProfile, length = ringThickness)

// ───────────────────────────────
// STEP 2: CREATE THE WEDGE CUTTER
// ───────────────────────────────

// We now create a thin rectangular wedge that will be used to cut the split. This wedge starts from the center and extends past the outer radius.

// First, define a little clearance so that the wedge cuts fully through the body
cutClearance = ringThickness * 0.5

// Compute wedge dimensions
ringOuterRadius = ringOuterDiameter / 2
wedgeLength = ringOuterRadius + cutClearance
wedgeHeight = ringThickness + cutClearance * 2

// Draw the wedge on a plane slightly below the ring
wedgePlane = offsetPlane(XY, offset = -cutClearance)
wedgeSketch = startSketchOn(wedgePlane)
wedgeProfile = startProfile(wedgeSketch, at = [0, -cutGapWidth / 2])
  |> yLine(length = cutGapWidth)
  |> xLine(length = wedgeLength)
  |> yLine(length = -cutGapWidth)
  |> line(endAbsolute = [profileStartX(%), profileStartY(%)])
  |> close()

wedgeBody = extrude(wedgeProfile, length = wedgeHeight)

// ──────────────────────
// STEP 3: SUBTRACT WEDGE
// ──────────────────────


// Finally, we subtract the wedge body from the solid ring. The result is a simple C-shape: a ring with a single clean gap.


cShape = subtract([solidRing], tools = [wedgeBody])