end-effector-gripper-fingers

// End Effector Grippers
// End effector grippers are devices attached to a robot's arm that allow it to interact with its environment and perform tasks like picking up, moving, and manipulating objects. They are essential for robots to perform useful work. Grippers are one type of end effector, but end effectors can also be tools like welding torches or cameras

// Set units
@settings(defaultLengthUnit = mm)

// Define sheet metal parameters
bracketThickness = 3
bracketBendRadius = 3.75

// Define linkage parameters
linkRadius = 8
linkLength = 70
linkAngle = 65deg

// Define a function to create an offset sketch, which will be used to loft the body of the hand
fn sectionSketch(offsetHeight, radius) {
  sectionSketch = startSketchOn(offsetPlane(XY, offset = offsetHeight))
    |> startProfile(at = [radius, -radius / 10])
    |> yLine(length = radius / 5, tag = $seg07)
    |> tangentialArc(angle = 60deg, radius = 8)
    |> angledLine(angle = 150deg, length = radius * 1.5, tag = $seg08)
    |> tangentialArc(angle = 60deg, radius = 8)
    |> angledLine(angle = -150deg, length = segLen(seg07))
    |> tangentialArc(angle = 60deg, radius = 8)
    |> yLine(length = -segLen(seg08))
    |> tangentialArc(angle = 60deg, radius = 8)
    |> angledLine(angle = -30deg, length = segLen(seg07))
    |> tangentialArc(angle = 60deg, radius = 8)
    |> angledLine(angle = 30deg, length = segLen(seg08))
    |> tangentialArc(endAbsolute = [profileStartX(%), profileStartY(%)])
    |> close()
  return sectionSketch
}

// Create instances of the body sketch at different heights to be lofted together
sketch1 = sectionSketch(offsetHeight = 0, radius = 40)
sketch2 = sectionSketch(offsetHeight = 20, radius = 50)
sketch3 = sectionSketch(offsetHeight = 80, radius = 90)
sketch4 = sectionSketch(offsetHeight = 100, radius = 105)
sketch5 = sectionSketch(offsetHeight = 120, radius = 100)

// Loft the lower trim of the body
lowerTrim = loft([sketch1, sketch2])
  |> appearance(color = "#f7f7f7")

// Loft the center body housing
housing = loft([clone(sketch2), sketch3, sketch4])
  |> appearance(color = "#0f0f0f")

// Loft the upper trim of the body
upperTrim = loft([clone(sketch4), sketch5])
  |> appearance(color = "#f7f7f7")

// Model an angled bracket that will be used to mount the three grippers
angleBracket = startSketchOn(offsetPlane(XY, offset = 120))
  |> startProfile(at = [97, 5])
  |> xLine(length = -90, tag = $seg01)
  |> tangentialArc(angle = -60deg, radius = bracketBendRadius + bracketThickness)
  |> angledLine(angle = 120deg, length = 90, tag = $seg02)
  |> angledLine(angle = 120deg - 90deg, length = bracketThickness, tag = $seg03)
  |> angledLine(angle = segAng(seg02) + 180deg, length = segLen(seg02), tag = $seg06)
  |> tangentialArc(angle = 60deg, radius = bracketBendRadius)
  |> xLine(length = segLen(seg01), tag = $seg05)
  |> line(endAbsolute = [profileStartX(%), profileStartY(%)], tag = $seg04)
  |> close()
  |> extrude(length = 40, tagEnd = $capEnd001)
  |> fillet(
       radius = 8,
       tags = [
         getCommonEdge(faces = [seg03, capEnd001]),
         getCommonEdge(faces = [seg04, capEnd001])
       ],
     )

// Add mounting provisions for the gripper linkages to each bracket
bracketHoles01 = startSketchOn(angleBracket, face = seg05)
hole01 = circle(bracketHoles01, center = [-70, 140], radius = 4.5)
hole02 = circle(bracketHoles01, center = [-30, 140], radius = 4.5)
bracketHoles02 = startSketchOn(angleBracket, face = seg06)
hole03 = circle(bracketHoles02, center = [70, 140], radius = 4.5)
hole04 = circle(bracketHoles02, center = [30, 140], radius = 4.5)
bracket = extrude([hole01, hole02, hole03, hole04], length = -bracketThickness)
  |> appearance(color = "#0f0f0f")

// Model a 2 force linkage to attach the grippers to the base
linkageBar = startSketchOn(XZ)
  |> startProfile(at = [
       30 + linkRadius * sin(linkAngle),
       140 - (linkRadius * cos(linkAngle))
     ])
  |> angledLine(angle = linkAngle, length = linkLength, tag = $seg10)
  |> tangentialArc(angle = 180deg, radius = linkRadius, tag = $seg09)
  |> angledLine(angle = tangentToEnd(seg09), length = segLen(seg10))
  |> tangentialArc(endAbsolute = [profileStartX(%), profileStartY(%)])
  |> close()
  |> subtract2d(tool = circle(center = [30, 140], radius = 4.5))
  |> subtract2d(tool = circle(
       center = [
         30 + linkLength * cos(linkAngle),
         140 + linkLength * sin(linkAngle)
       ],
       radius = 4.5,
     ))
  |> extrude(length = 8, symmetric = true)
  |> appearance(color = "#f7f7f7")
  |> patternLinear3d(instances = 2, distance = 40, axis = [1, 0, 0])

// Create the base sheet metal that each gripper will be cut from
gripBaseBracket = startSketchOn(offsetPlane(XY, offset = 129 + linkLength * sin(linkAngle)))
  |> startProfile(at = [82 + linkLength * cos(linkAngle), 12])
  |> xLine(length = -77, tag = $seg01e)
  |> tangentialArc(angle = 60deg, radius = bracketBendRadius + bracketThickness)
  |> angledLine(angle = -120deg, length = 6, tag = $seg02e)
  |> tangentialArc(angle = 60deg, radius = bracketBendRadius + bracketThickness)
  |> angledLine(angle = -60deg, length = 6, tag = $seg03e)
  |> tangentialArc(angle = 60deg, radius = bracketBendRadius + bracketThickness)
  |> xLine(length = segLen(seg01e))
  |> yLine(length = bracketThickness)
  |> xLine(length = -segLen(seg01e))
  |> tangentialArc(angle = -60deg, radius = bracketBendRadius)
  |> angledLine(angle = 120deg, length = segLen(seg03e))
  |> tangentialArc(angle = -60deg, radius = bracketBendRadius)
  |> angledLine(angle = 60deg, length = segLen(seg02e))
  |> tangentialArc(angle = -60deg, radius = bracketBendRadius)
  |> xLine(length = segLen(seg01e))
  |> line(endAbsolute = [profileStartX(%), profileStartY(%)])
  |> close()
  |> extrude(%, length = 80)

// Use subtract operations to remove excess material from the gripper, as well as model the mounting holes
gripperCuts = startSketchOn(XZ)
cutOuter = circle(
       gripperCuts,
       center = [
         140 + linkLength * cos(linkAngle),
         290 + linkLength * sin(linkAngle)
       ],
       radius = 150,
     )
  |> extrude(length = 40, symmetric = true)
cutInner = circle(
       gripperCuts,
       center = [
         -14 + linkLength * cos(linkAngle),
         120 + linkLength * sin(linkAngle)
       ],
       radius = 35,
     )
  |> extrude(length = 40, symmetric = true)

mountingHole01 = circle(
       gripperCuts,
       center = [
         30 + linkLength * cos(linkAngle),
         140 + linkLength * sin(linkAngle)
       ],
       radius = 4.5,
     )
  |> extrude(length = 40, symmetric = true)
mountingHole02 = circle(
       gripperCuts,
       center = [
         70 + linkLength * cos(linkAngle),
         140 + linkLength * sin(linkAngle)
       ],
       radius = 4.5,
     )
  |> extrude(length = 40, symmetric = true)

// Remove all identified material from the gripper
gripper = subtract(
       [gripBaseBracket],
       tools = [
         union([
  union([mountingHole01, mountingHole02]),
  union([cutOuter, cutInner])
])
       ],
     )
  |> appearance(color = "#0f0f0f")

// Create a cotter pin to secure the linkages to the base
basePins = startSketchOn(offsetPlane(YZ, offset = 30))
  |> startProfile(at = [-9.5, 140.5])
  |> yLine(length = 5)
  |> xLine(length = 1)
  |> yLine(length = -1.5)
  |> xLine(length = 17)
  |> yLine(length = 1.5)
  |> xLine(length = 1)
  |> yLine(length = -5)
  |> line(endAbsolute = [profileStartX(%), profileStartY(%)])
  |> close()
  |> revolve(axis = {
       direction = [1.0, 0.0],
       origin = [0.0, 140.0]
     })
  |> patternLinear3d(instances = 2, distance = 40, axis = [1, 0, 0])
  |> appearance(color = "#a6a6a6")

// Revolve a cotter pin and washers to secure the gripper to the linkages
gripperPins = startSketchOn(offsetPlane(YZ, offset = 30 + linkLength * cos(linkAngle)))
  |> startProfile(at = [
       0,
       140 + linkLength * sin(linkAngle) + 4.5
     ])
  |> xLine(length = -4.1)
  |> yLine(length = 5)
  |> xLine(length = -4.8)
  |> yLine(length = -5)
  |> xLine(length = -3.1)
  |> yLine(length = 1)
  |> xLine(length = -1)
  |> yLine(endAbsolute = 140 + linkLength * sin(linkAngle) + .5)
  |> xLine(endAbsolute = 0)
  |> mirror2d(axis = Y)
  |> close(%)
  |> revolve(axis = {
       direction = [1.0, 0.0],
       origin = [0.0, 140 + linkLength * sin(linkAngle)]
     })
  |> patternLinear3d(instances = 2, distance = 40, axis = [1, 0, 0])
  |> appearance(color = "#a6a6a6")

// Pattern 3 each item around the center so that the hand has 3 fingers
[
       bracket,
       linkageBar,
       gripper,
       basePins,
       gripperPins
     ]
  |> patternCircular3d(
       instances = 3,
       axis = [0, 0, 1],
       center = [0, 0, 0],
       arcDegrees = 360,
       rotateDuplicates = true,
     )