Parametric double hook swept from a 5 mm circular section.

// Double hook
// Parametric double hook swept from a 5 mm circular section.
// Categories: Maker

@settings(defaultLengthUnit = mm)

// Driving dimensions
sectionDiameter = 5mm
lowerTipLength = 5mm
bendRadius = 3mm
lowerHookDepth = 10mm
connectorLength = 34mm
upperBottomLength = 10mm
upperSideLength = 10mm
upperTopLength = 4mm

lowerTipEndY = -lowerTipLength
lowerBendStartX = -bendRadius
lowerBendStartY = -(lowerTipLength + bendRadius)
lowerBendCenterY = -lowerTipLength
lowerBridgeEndX = bendRadius - lowerHookDepth
upperEntryEndX = -lowerHookDepth
connectorTopY = -lowerTipLength + connectorLength
upperBottomEndY = connectorTopY + upperBottomLength
upperLowerBendEndX = -(lowerHookDepth + bendRadius)
upperLowerBendEndY = upperBottomEndY + bendRadius
upperSideEndX = -(lowerHookDepth + bendRadius + upperSideLength)
upperTopStartX = -(lowerHookDepth + upperSideLength + 2 * bendRadius)
upperTopStartY = upperBottomEndY
upperTopEndY = upperTopStartY - upperTopLength

// Top-view path
hookPath = sketch(on = XY) {
  lowerTip = line(start = [var 0mm, var 0mm], end = [var 0mm, var -3.5mm])
  coincident([lowerTip.start, [0mm, 0mm]])
  vertical(lowerTip)
  distance([lowerTip.start, lowerTip.end]) == lowerTipLength

  lowerBend = arc(start = [var -3mm, var -6.5mm], end = [var 0mm, var -3.5mm], center = [var -3mm, var -3.5mm])
  coincident([lowerBend.end, lowerTip.end])
  coincident([
    lowerBend.start,
    [lowerBendStartX, lowerBendStartY]
  ])
  tangent([lowerTip, lowerBend])
  radius(lowerBend) == bendRadius

  lowerBridge = line(start = [var -3mm, var -6.5mm], end = [var -7mm, var -6.5mm])
  coincident([lowerBridge.start, lowerBend.start])
  horizontal(lowerBridge)
  distance([lowerBridge.start, lowerBridge.end]) == lowerHookDepth - (2 * bendRadius)
  tangent([lowerBend, lowerBridge])

  upperEntry = arc(start = [var -10mm, var -3.5mm], end = [var -7mm, var -6.5mm], center = [var -7mm, var -3.5mm])
  coincident([upperEntry.end, lowerBridge.end])
  coincident([
    upperEntry.start,
    [upperEntryEndX, lowerBendCenterY]
  ])
  tangent([lowerBridge, upperEntry])
  radius(upperEntry) == bendRadius

  connector = line(start = [var -10mm, var -3.5mm], end = [var -10mm, var 30.5mm])
  coincident([connector.start, upperEntry.start])
  vertical(connector)
  distance([connector.start, connector.end]) == connectorLength
  tangent([upperEntry, connector])

  upperBottom = line(start = [var -10mm, var 30.5mm], end = [var -10mm, var 40.5mm])
  coincident([upperBottom.start, connector.end])
  vertical(upperBottom)
  distance([upperBottom.start, upperBottom.end]) == upperBottomLength

  upperLowerBend = arc(start = [var -10mm, var 40.5mm], end = [var -13mm, var 43.5mm], center = [var -13mm, var 40.5mm])
  coincident([upperLowerBend.start, upperBottom.end])
  coincident([
    upperLowerBend.end,
    [upperLowerBendEndX, upperLowerBendEndY]
  ])
  tangent([upperBottom, upperLowerBend])
  radius(upperLowerBend) == bendRadius

  upperSide = line(start = [var -13mm, var 43.5mm], end = [var -23mm, var 43.5mm])
  coincident([upperSide.start, upperLowerBend.end])
  horizontal(upperSide)
  distance([upperSide.start, upperSide.end]) == upperSideLength
  tangent([upperLowerBend, upperSide])

  upperTopBend = arc(start = [var -23mm, var 43.5mm], end = [var -26mm, var 40.5mm], center = [var -23mm, var 40.5mm])
  coincident([upperTopBend.start, upperSide.end])
  coincident([
    upperTopBend.end,
    [upperTopStartX, upperTopStartY]
  ])
  tangent([upperSide, upperTopBend])
  radius(upperTopBend) == bendRadius

  upperTop = line(start = [var -26mm, var 40.5mm], end = [var -26mm, var 36.5mm])
  coincident([upperTop.start, upperTopBend.end])
  vertical(upperTop)
  distance([upperTop.start, upperTop.end]) == upperTopLength
  tangent([upperTopBend, upperTop])
}

// Circular sweep section
sectionSketch = sketch(on = XZ) {
  sectionCircle = circle(start = [var 2.5mm, var 0mm], center = [var 0mm, var 0mm])
  coincident([sectionCircle.center, [0mm, 0mm]])
  diameter(sectionCircle) == sectionDiameter
}

sectionRegion = region(segments = [sectionSketch.sectionCircle])
hook = sweep(
  sectionRegion,
  path = [
    hookPath.lowerTip,
    hookPath.lowerBend,
    hookPath.lowerBridge,
    hookPath.upperEntry,
    hookPath.connector,
    hookPath.upperBottom,
    hookPath.upperLowerBend,
    hookPath.upperSide,
    hookPath.upperTopBend,
    hookPath.upperTop
  ],
)
  |> appearance(color = "#8a8e93", metalness = 100, roughness = 50)


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