Quarter‑turn elbow with two bolt‑up flanges used to join 94 × 71 mm pipe in industrial fluid systems.

// 90° Flanged Pipe Elbow
// Quarter‑turn elbow with two bolt‑up flanges used to join 94 × 71 mm pipe in industrial fluid systems.
// Categories: Manufacturing, Construction

@settings(defaultLengthUnit = mm, kclVersion = 1.0)

// Parameters
elbowBendAngleDegrees = 90 // sweep magnitude in degrees
elbowCenterlineBendRadius = 63 // bend centerline radius R
pipeOuterDiameter = 94
pipeInnerDiameter = 71

flangeOuterDiameter = 120
flangeThickness = 20
flangeBoreInnerDiameter = 71 // same as pipe inner diameter
boltCircleDiameter = 107
boltHoleDiameter = 10
boltHoleCount = 16

// Derived values
pipeOuterRadius = pipeOuterDiameter / 2
pipeInnerRadius = pipeInnerDiameter / 2
boltCircleRadius = boltCircleDiameter / 2
boltHoleRadius = boltHoleDiameter / 2

// Elbow: quarter‑torus by revolving an annulus on XY about the global Y axis
elbowSketch = startSketchOn(XY)
elbowOuterCircle = circle(elbowSketch, center = [elbowCenterlineBendRadius, 0], radius = pipeOuterRadius)
elbowInnerCircle = circle(elbowSketch, center = [elbowCenterlineBendRadius, 0], radius = pipeInnerRadius)
elbowAnnulusProfile = elbowOuterCircle
  |> subtract2d(tool = elbowInnerCircle)

// Note: sign chosen to match current, verified orientation; do not change without intent
elbowBody = revolve(elbowAnnulusProfile, axis = Y, angle = -elbowBendAngleDegrees)

// Flanges: create one prototype (vertical on YZ), then clone and place the horizontal one using global rotations
verticalFlangeSketchOnYz = startSketchOn(-YZ)
verticalFlangeOuterCircle = circle(verticalFlangeSketchOnYz, center = [0, elbowCenterlineBendRadius], radius = flangeOuterDiameter / 2)
verticalFlangeBoreCircle = circle(verticalFlangeSketchOnYz, center = [0, elbowCenterlineBendRadius], radius = flangeBoreInnerDiameter / 2)
verticalFlangeBoltHoleSeed = circle(
  verticalFlangeSketchOnYz,
  center = [
    boltCircleRadius,
    elbowCenterlineBendRadius
  ],
  radius = boltHoleRadius,
)
verticalFlangeBoltHolePattern = patternCircular2d(
  verticalFlangeBoltHoleSeed,
  instances = boltHoleCount,
  center = [0, elbowCenterlineBendRadius],
  arcDegrees = 360,
  rotateDuplicates = false,
)
verticalFlangeProfile = verticalFlangeOuterCircle
  |> subtract2d(tool = [
       verticalFlangeBoreCircle,
       verticalFlangeBoltHolePattern
     ])
verticalFlange = extrude(verticalFlangeProfile, length = flangeThickness, method = NEW)

// Horizontal flange is a clone of the vertical flange; use global rotations only for robust placement
horizontalFlange = clone(verticalFlange)
  |> rotate(axis = Y, angle = -90deg, global = true) // move to XY, face −Z
  |> rotate(axis = Z, angle = 180deg, global = true) // clock to +X location


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pipe-elbow-90deg