ball-bearing

// Ball Bearing
// A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. The primary purpose of a ball bearing is to reduce rotational friction and support radial and axial loads.


// Define constants like ball diameter, inside diamter, overhange length, and thickness
outsideDiameter = 1.625
sphereDia = 0.25
shaftDia = 0.75
overallThickness = 0.313
wallThickness = 0.100
overHangLength = .3
nBalls = 10
chainWidth = sphereDia / 2
chainThickness = sphereDia / 8
linkDiameter = sphereDia / 4

customPlane = {
  plane = {
    origin = {
      x = 0,
      y = 0,
      z = -overallThickness / 2
    },
    xAxis = { x = 1, y = 0, z = 0 },
    yAxis = { x = 0, y = 1, z = 0 },
    zAxis = { x = 0, y = 0, z = 1 }
  }
}

// Sketch the inside bearing piece
insideWallSketch = startSketchOn(customPlane)
  |> circle({
       center = [0, 0],
       radius = shaftDia / 2 + wallThickness
     }, %)
  |> hole(circle({
       center = [0, 0],
       radius = shaftDia / 2
     }, %), %)

// Extrude the inside bearing piece
insideWall = extrude(overallThickness, insideWallSketch)

// Create the sketch of one of the balls
ballsSketch = startSketchOn("XY")
  |> startProfileAt([shaftDia / 2 + wallThickness, 0.001], %)
  |> arc({
       angleEnd = 0,
       angleStart = 180,
       radius = sphereDia / 2
     }, %)
  |> close(%)

// Revolve the ball to make a sphere and pattern around the inside wall
balls = revolve({ axis = "X" }, ballsSketch)
  |> patternCircular3d({
       arcDegrees = 360,
       axis = [0, 0, 1],
       center = [0, 0, 0],
       instances = nBalls,
       rotateDuplicates = true
     }, %)

// Create the sketch for the chain around the balls
chainSketch = startSketchOn("XY")
  |> startProfileAt([
       shaftDia / 2 + wallThickness + sphereDia / 2 - (chainWidth / 2),
       0.125 * sin(toRadians(60))
     ], %)
  |> arc({
       angleEnd = 60,
       angleStart = 120,
       radius = sphereDia / 2
     }, %)
  |> line([0, chainThickness], %)
  |> line([-chainWidth, 0], %)
  |> close(%)

// Revolve the chain sketch
chainHead = revolve({ axis = "X" }, chainSketch)
  |> patternCircular3d({
       arcDegrees = 360,
       axis = [0, 0, 1],
       center = [0, 0, 0],
       instances = nBalls,
       rotateDuplicates = true
     }, %)

// Create the sketch for the links in between the chains
linkSketch = startSketchOn("XZ")
  |> circle({
       center = [
         shaftDia / 2 + wallThickness + sphereDia / 2,
         0
       ],
       radius = linkDiameter / 2
     }, %)

// Revolve the link sketch
linkRevolve = revolve({ axis = 'Y', angle = 360 / nBalls }, linkSketch)
  |> patternCircular3d({
       arcDegrees = 360,
       axis = [0, 0, 1],
       center = [0, 0, 0],
       instances = nBalls,
       rotateDuplicates = true
     }, %)

// Create the sketch for the outside walls
outsideWallSketch = startSketchOn(customPlane)
  |> circle({
       center = [0, 0],
       radius = outsideDiameter / 2
     }, %)
  |> hole(circle({
       center = [0, 0],
       radius = shaftDia / 2 + wallThickness + sphereDia
     }, %), %)

outsideWall = extrude(overallThickness, outsideWallSketch)

// https://www.mcmaster.com/60355K185/