A rectangular frame made up of T-slotted rails

// T-Slotted Rectangle Frame
// A rectangular frame made up of T-slotted rails
// Categories: Manufacturing, Construction

// Set units
@settings(defaultLengthUnit = in, kclVersion = 1.0)

frameLength = 2ft
frameWidth = 1.5ft
railHeight = 1

fn railTslot(railHeight, length) {
  // Define rail parameters
  interiorRadius = 0.01
  scoreDepth = 0.018
  arcEnd = 0.0275
  holeDiameter = 0.262
  // Sketch one inner leg of the extruded rail
  railProfile = startSketchOn(-XZ)
    |> startProfile(at = [0.5, (1 - 0.356) / 2])
    |> xLine(length = -0.08)
    |> tangentialArc(angle = 45deg, radius = .09)
    |> angledLine(angle = 45deg, endAbsoluteY = 0.113)
    |> tangentialArc(angle = 135deg, radius = interiorRadius)
    |> xLine(endAbsolute = .5 - (.320 / 2) - interiorRadius)
    |> tangentialArc(angle = -90deg, radius = interiorRadius)
    |> yLine(endAbsolute = interiorRadius)
    |> tangentialArc(angle = -90deg, radius = interiorRadius)
    |> xLine(length = -0.03)
    |> arc(angleStart = 0, angleEnd = 180deg, radius = scoreDepth)
    |> xLine(length = -0.1)
    |> arc(angleStart = 0, angleEnd = 180deg, radius = scoreDepth)
    |> xLine(length = -0.03)
    |> tangentialArc(endAbsolute = [arcEnd, arcEnd])

    // Mirror the sketch about the diagonal to complete the leg. Then mirror across the center of the profile in the horizontal and vertical directions. Then close the sketch
    |> mirror2d(axis = {
         direction = [1.0, 1.0],
         origin = [0.0, 0.0]
       })
    |> mirror2d(axis = {
         direction = [1.0, 0.0],
         origin = [0.0, 0.5]
       })
    |> mirror2d(axis = {
         direction = [0.0, 1.0],
         origin = [0.5, 0.0]
       })
    |> close()

    // Sketch a dimensioned hole in the center of the profile
    |> subtract2d(tool = circle(center = [railHeight / 2, railHeight / 2], radius = holeDiameter / 2))

    // Scale the entire sketch by a factor of the rail height, then extrude
    |> scale(x = railHeight, y = railHeight, z = railHeight)
    |> extrude(length)

  return railProfile
}

// Generate a pair of rails along the X direction
railTslot(railHeight, length = frameWidth)
  |> rotate(yaw = 90)
  |> patternLinear3d(instances = 2, distance = frameLength - railHeight, axis = [0, 1, 0])

// Generate a pair of rails along the Y direction
railTslot(railHeight, length = frameLength - (2 * railHeight))
  |> patternLinear3d(instances = 2, distance = frameWidth - railHeight, axis = [-1, 0, 0])


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t-slot-rectangle