An open-style impeller for a centrifugal liquid pump

// Liquid Impeller
// An open-style impeller for a centrifugal liquid pump
// Categories: Aerospace, Manufacturing

// Set units
@settings(defaultLengthUnit = in)

// Define parameters
impellerDiameter = 4
plateHeight = 0.1
vaneCount = 7
vaneHeight = 0.3
vaneThickness = 0.15
mountDiameter = 0.25

// Draw the profile of the mounting hole
mountingHole = startSketchOn(XY)
  |> startProfile(at = [mountDiameter / 2, 0])
  |> arc(angleStart = 0, angleEnd = 60, diameter = mountDiameter)
  |> xLine(endAbsolute = 0)
  |> mirror2d(axis = X)
  |> mirror2d(axis = Y)
  |> close()
  |> extrude(length = plateHeight * 4)

// Revolve the base plate of the impeller
basePlate = startSketchOn(XZ)
  |> startProfile(at = [0, 0])
  |> xLine(length = impellerDiameter / 2)
  |> yLine(length = plateHeight)
  |> xLine(length = -impellerDiameter / 2.6, tag = $seg01)
  |> tangentialArc(angle = -45deg, radius = plateHeight, tag = $seg02)
  |> angledLine(angle = tangentToEnd(seg02), endAbsoluteX = mountDiameter)
  |> xLine(endAbsolute = profileStartX())
  |> yLine(endAbsolute = profileStartY())
  |> close()
  |> revolve(axis = Y)

  // Subtract the mounting hole from the base plate
  |> subtract(tools = mountingHole)

// Model a vane of the impeller
vane = startSketchOn(basePlate, face = seg01)
  |> startProfile(at = polar(angle = 15, length = impellerDiameter / 2))
  |> arc(angleStart = 0, angleEnd = -100, radius = impellerDiameter / 3)
  |> tangentialArc(angle = -180deg, diameter = vaneThickness)
  |> tangentialArc(angle = 100deg, radius = impellerDiameter / 3 - vaneThickness)
  |> tangentialArc(endAbsolute = [profileStartX(%), profileStartY(%)])
  |> close()
  |> extrude(length = vaneHeight)

  // Pattern the vane around the Z axis
  |> patternCircular3d(
       useOriginal = true,
       instances = vaneCount,
       axis = Z,
       center = [0, 0, 0],
     )


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