helium-tank

// Helium Tank
// A helium tank is a portable pressure vessel used to store and dispense helium gas for a variety of commercial and entertainment purposes

// Set units
@settings(defaultLengthUnit = in)

// Define parameters
tankHeight = 2.5ft
tankDiameter = 9
wallThickness = 0.125
portDiameter = 1.25
bracketThickness = 0.090
boltSize = 1 / 4

// Sketch the perimeter of the gas tank- inside and out, then revolve around the vertical axis.
tankSketch = startSketchOn(YZ)
  |> startProfile(at = [portDiameter / 2, tankHeight])
  |> yLine(length = -0.6)
  |> xLine(length = 0.1)
  |> tangentialArc(angle = -110, radius = 0.1)
  |> tangentialArc(angle = 40, radius = 0.6)
  |> tangentialArc(angle = -110, radius = 0.1)
  |> tangentialArc(angle = 180, radius = 0.1)
  |> tangentialArc(angle = -90, radius = tankDiameter / 2 - lastSegX(%), tag = $seg01)
  |> angledLine(angle = tangentToEnd(seg01), endAbsoluteY = 1.5, tag = $seg09)
  |> tangentialArc(angle = -90, radius = 2, tag = $seg02)
  |> angledLine(angle = tangentToEnd(seg02), endAbsoluteX = 0.001, tag = $seg08)
  |> yLine(length = wallThickness)
  |> xLine(length = segLen(seg08))
  |> tangentialArc(angle = 90, radius = 2 - wallThickness)
  |> yLine(length = segLen(seg09))
  |> tangentialArc(angle = 90, radius = tankDiameter / 2 - wallThickness - 1.3)
  |> xLine(endAbsolute = profileStartX(%) - .1)
  |> yLine(endAbsolute = profileStartY(%))
  |> line(endAbsolute = [profileStartX(%), profileStartY(%)])
  |> close()

// Only revolving to 220deg so that the interior of the tank is visible. It should ultimately be closed at 360deg
tankRevolve = revolve(tankSketch, angle = 220, axis = Y)

// Model the brass valve on top of the tank port
valveBody = startSketchOn(offsetPlane(XY, offset = tankHeight - 0.5))
  |> circle(center = [0, 0], radius = portDiameter / 1.9, tag = $seg03)
  |> extrude(length = 1.5, tagEnd = $capEnd001)
  |> fillet(
       radius = 0.1,
       tags = [
         getCommonEdge(faces = [seg03, capEnd001])
       ],
     )

// Model the outlet port of the valve, then union it all together
valvePort = startSketchOn(YZ)
  |> circle(center = [0, tankHeight + 0.3], radius = portDiameter / 3)
  |> subtract2d(tool = circle(center = [0, tankHeight + 0.3], radius = portDiameter / 3.25))
  |> extrude(length = 1.3)
valve = union([valveBody, valvePort])
  |> appearance(color = "#9a4618")

// Sketch the offset profile of the mounting bracket
bracketOffsetProfile = startSketchOn(offsetPlane(XY, offset = tankHeight * 0.67))
  |> startProfile(at = [0, tankDiameter / 2 + wallThickness])
  |> xLine(length = -0.1)
  |> tangentialArc(angle = 35, radius = tankDiameter / 2 + wallThickness)
  |> tangentialArc(angle = -135, radius = 0.25 - wallThickness, tag = $seg06)
  |> angledLine(angle = tangentToEnd(seg06), length = tankDiameter / 7)
  |> tangentialArc(angle = -80, radius = 0.25 - wallThickness, tag = $seg07)
  |> angledLine(angle = tangentToEnd(seg07), endAbsoluteX = 0)
  |> mirror2d(axis = Y)
  |> close()

// Sketch the outer perimeter of the offset bracket, then subtract the inner offset to create a constant thickness sheet metal hoop
bracketProfile = startSketchOn(offsetPlane(XY, offset = tankHeight * 0.67))
  |> startProfile(at = [0, tankDiameter / 2])
  |> xLine(length = -0.1)
  |> tangentialArc(angle = 35, radius = tankDiameter / 2)
  |> tangentialArc(angle = -135, radius = 0.25, tag = $seg04)
  |> angledLine(angle = tangentToEnd(seg04), length = tankDiameter / 7)
  |> tangentialArc(angle = -80, radius = 0.25, tag = $seg05)
  |> angledLine(angle = tangentToEnd(seg05), endAbsoluteX = 0)
  |> mirror2d(axis = Y)
  |> close()
  |> subtract2d(tool = bracketOffsetProfile)
  |> extrude(length = 1, symmetric = true)

// Cut holes in the bracket for a mounting strap
strapSleeve = startSketchOn(offsetPlane(XY, offset = tankHeight * 0.67))
  |> circle(center = [0, .125 / 2], radius = 4.75)
  |> subtract2d(tool = circle(center = [0, .125 / 2], radius = 4.65))
  |> extrude(length = .8, symmetric = true)
bracketSleeve = subtract([bracketProfile], tools = [strapSleeve])

// Create holes in the bracket for anchor mounts to secure the bracket to a wall
mountingHoles = startSketchOn(offsetPlane(XZ, offset = -tankDiameter / 1.9))
  |> circle(center = [tankDiameter / 4.5, tankHeight * 0.67], radius = boltSize / 2)
  |> extrude(length = -5)

bracket = subtract(
       [bracketSleeve],
       tools = union(patternLinear3d(
         mountingHoles,
         instances = 2,
         distance = tankDiameter / 2.25,
         axis = [-1, 0, 0],
       )),
     )
  |> appearance(color = "#cd0404")

// Model a circular strap to secure the tank to the bracket
mountingStrap = startSketchOn(offsetPlane(XY, offset = tankHeight * 0.67))
  |> circle(center = [0, .155 / 2], radius = tankDiameter / 1.9)
  |> subtract2d(tool = circle(center = [0, .155 / 2], radius = tankDiameter / 1.9 - 0.1))
  |> extrude(length = .75, symmetric = true)
  |> appearance(color = "#210d03")

// Create a second instance of the bracket and strap at a lower point on the tank
[bracket, mountingStrap]
  |> patternLinear3d(
       %,
       instances = 2,
       distance = tankHeight * 0.33,
       axis = [0, 0, -1],
     )