kcl-samples → bracket →
bracket
KCL
// Shelf Bracket
// This is a bracket that holds a shelf. It is made of aluminum and is designed to hold a force of 300 lbs. The bracket is 6 inches wide and the force is applied at the end of the shelf, 12 inches from the wall. The bracket has a factor of safety of 1.2. The legs of the bracket are 5 inches and 2 inches long. The thickness of the bracket is calculated from the constraints provided.
// Define constants
const sigmaAllow = 35000 // psi (6061-T6 aluminum)
const width = 6 // inch
const p = 300 // Force on shelf - lbs
const factorOfSafety = 1.2 // FOS of 1.2
const shelfMountL = 5 // inches
const wallMountL = 2 // inches
const shelfDepth = 12 // Shelf is 12 inches in depth from the wall
const moment = shelfDepth * p // assume the force is applied at the end of the shelf to be conservative (lb-in)
const filletRadius = .375 // inches
const extFilletRadius = .25 // inches
const mountingHoleDiameter = 0.5 // inches
// Calculate required thickness of bracket
const thickness = sqrt(moment * factorOfSafety * 6 / (sigmaAllow * width)) // this is the calculation of two brackets holding up the shelf (inches)
// Sketch the bracket body and fillet the inner and outer edges of the bend
const bracketLeg1Sketch = startSketchOn('XY')
|> startProfileAt([0, 0], %)
|> line([shelfMountL-filletRadius, 0], %, $fillet1)
|> line([0, width], %, $fillet2)
|> line([-shelfMountL + filletRadius, 0], %)
|> close(%)
|> hole(circle([1, 1], mountingHoleDiameter/2, %), %)
|> hole(circle([shelfMountL-1.5, width-1], mountingHoleDiameter/2, %), %)
|> hole(circle([1, width-1], mountingHoleDiameter/2, %), %)
|> hole(circle([shelfMountL-1.5, 1], mountingHoleDiameter/2, %), %)
// Extrude the leg 2 bracket sketch
const bracketLeg1Extrude = extrude(thickness, bracketLeg1Sketch)
|> fillet({
radius: extFilletRadius,
tags: [
getNextAdjacentEdge(fillet1),
getNextAdjacentEdge(fillet2)
],
}, %)
// Sketch the fillet arc
const filletSketch = startSketchOn('XZ')
|> startProfileAt([0, 0], %)
|> line([0, thickness], %)
|> arc({
angleEnd: 180,
angleStart: 90,
radius: filletRadius + thickness,
}, %)
|> line([thickness, 0], %)
|> arc({
angleEnd: 90,
angleStart: 180,
radius: filletRadius,
}, %)
// Sketch the bend
const filletExtrude = extrude(-width, filletSketch)
// Create a custom plane for the leg that sits on the wall
const customPlane = {
plane: {
origin: { x: -filletRadius, y: 0, z: 0 },
xAxis: { x: 0, y: 1, z: 0 },
yAxis: { x: 0, y: 0, z: 1 },
zAxis: { x: 1, y: 0, z: 0 }
}
}
// Create a sketch for the second leg
const bracketLeg2Sketch = startSketchOn(customPlane)
|> startProfileAt([0, -filletRadius], %)
|> line([width, 0], %)
|> line([0, -wallMountL], %, $fillet3)
|> line([-width, 0], %, $fillet4)
|> close(%)
|> hole(circle([1, -1.5], mountingHoleDiameter / 2, %), %)
|> hole(circle([5, -1.5], mountingHoleDiameter / 2, %), %)
// Extrude the second leg
const bracketLeg2Extrude = extrude(-thickness, bracketLeg2Sketch)
|> fillet({
radius: extFilletRadius,
tags: [
getNextAdjacentEdge(fillet3),
getNextAdjacentEdge(fillet4)
],
}, %)