a compact 90° mounting bracket used to join parts at right angles; the slot provides alignment adjustment while the countersunk hole allows a flush screw head.

// Adjustable L‑Bracket
// a compact 90° mounting bracket used to join parts at right angles; the slot provides alignment adjustment while the countersunk hole allows a flush screw head.
// Categories: Manufacturing, Automotive, Aerospace, Construction

// default units
@settings(defaultLengthUnit = mm)

// model parameters
halfBracketWidth = 20
fastenerHoleDiameter = 12
countersinkOuterDiameter = 22

uprightTabHoleCenterOffsetFromBend = 50
slotCenterOffsetFromBend = 150

sheetMetalThickness = 4
insideBendRadius = 8
outsideBendRadius = insideBendRadius + sheetMetalThickness
overallBracketWidth = halfBracketWidth * 2

// outline profile
outlineSketch = startSketchOn(XZ)
outlineProfile = startProfile(outlineSketch, at = [0, 0])
  |> yLine(length = uprightTabHoleCenterOffsetFromBend + halfBracketWidth, tag = $seg04)
  |> xLine(length = sheetMetalThickness, tag = $seg05)
  |> yLine(length = -uprightTabHoleCenterOffsetFromBend - halfBracketWidth + sheetMetalThickness, tag = $seg02)
  |> xLine(length = slotCenterOffsetFromBend + halfBracketWidth - sheetMetalThickness, tag = $seg01)
  |> yLine(length = -sheetMetalThickness, tag = $seg06)
  |> line(endAbsolute = [profileStartX(%), profileStartY(%)], tag = $seg03)
  |> close()

// extrude body
bracketBodySolid = extrude(
  outlineProfile,
  length = overallBracketWidth,
  symmetric = true,
  tagEnd = $capEnd,
  tagStart = $capStart,
)

// bend fillets
insideBendFillet = fillet(bracketBodySolid, tags = getCommonEdge(faces = [seg01, seg02]), radius = insideBendRadius)
outsideBendFillet = fillet(bracketBodySolid, tags = getCommonEdge(faces = [seg03, seg04]), radius = outsideBendRadius)

// end rounds
freeEndCornerFillets = fillet(
  bracketBodySolid,
  tags = [
    getCommonEdge(faces = [seg05, capEnd]),
    getCommonEdge(faces = [seg05, capStart]),
    getCommonEdge(faces = [seg06, capEnd]),
    getCommonEdge(faces = [seg06, capStart])
  ],
  radius = halfBracketWidth,
)

// tab hole
bracketWithCountersunkHole = hole::hole(
  bracketBodySolid,
  face = seg02,
  cutAt = [uprightTabHoleCenterOffsetFromBend, 0],
  holeBottom =   hole::flat(),
  holeBody =   hole::blind(depth = sheetMetalThickness, diameter = fastenerHoleDiameter),
  holeType =   hole::countersink(angle = 90deg, diameter = countersinkOuterDiameter),
)

// slot sketch
slotWidth = fastenerHoleDiameter
slotOverallLength = fastenerHoleDiameter * 3
slotSketch = startSketchOn(XY)
slotProfile = startProfile(
       slotSketch,
       at = [
         slotCenterOffsetFromBend,
         -slotWidth / 2
       ],
     )
  |> xLine(length = -slotOverallLength)
  |> tangentialArc(end = [0, slotWidth], tag = $seg08)
  |> angledLine(angle = tangentToEnd(seg08), length = slotOverallLength)
  |> tangentialArc(endAbsolute = [profileStartX(%), profileStartY(%)])
  |> close()

// slot cut
slotCutSolid = extrude(slotProfile, length = sheetMetalThickness)

// boolean cut
bracketFinished = subtract(bracketWithCountersunkHole, tools = slotCutSolid)

// material appearance
appearance(
  [bracketFinished],
  color = "#c8ff00",
  roughness = 50,
  metalness = 0,
)


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bracket-with-slot