74c07fc0eb
* update onboarding bracket to be robust * update onboarding bracket with bends * checking if asserts causing parse failure * fun fact, it was not the asserts * fix bracket loading Signed-off-by: Jess Frazelle <github@jessfraz.com> * updates Signed-off-by: Jess Frazelle <github@jessfraz.com> --------- Signed-off-by: Jess Frazelle <github@jessfraz.com> Co-authored-by: Pierre Jacquier <pierrejacquier39@gmail.com> Co-authored-by: Jess Frazelle <github@jessfraz.com> Co-authored-by: Jess Frazelle <jessfraz@users.noreply.github.com>
85 lines
3.7 KiB
Plaintext
85 lines
3.7 KiB
Plaintext
// Shelf Bracket
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// 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.
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// Set units
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@settings(defaultLengthUnit = in)
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// Define parameters
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sigmaAllow = 35000 // psi (6061-T6 aluminum)
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width = 5.0
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p = 300 // Force on shelf - lbs
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fos = 1.2 // Factor of safety of 1.2
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shelfMountLength = 5.0
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wallMountLength = 2.25
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shelfDepth = 12 // Shelf is 12 inches deep from the wall
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shelfMountingHoleDiameter = .50
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wallMountingHoleDiameter = .625
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// Calculated parameters
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moment = shelfDepth * p // assume the force is applied at the end of the shelf
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thickness = sqrt(moment * fos * 6 / (sigmaAllow * width)) // required thickness for two brackets to hold up the shelf
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bendRadius = 0.25
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extBendRadius = bendRadius + thickness
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filletRadius = .5
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shelfMountingHolePlacementOffset = shelfMountingHoleDiameter * 1.5
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wallMountingHolePlacementOffset = wallMountingHoleDiameter * 1.5
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// Add checks to ensure bracket is possible. These make sure that there is adequate distance between holes and edges.
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assertGreaterThanOrEq(wallMountLength, wallMountingHoleDiameter * 3, "Holes not possible. Either decrease hole diameter or increase wallMountLength")
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assertGreaterThanOrEq(shelfMountLength, shelfMountingHoleDiameter * 5.5, "wallMountLength must be longer for hole sizes to work. Either decrease mounting hole diameters or increase shelfMountLength")
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assertGreaterThanOrEq(width, shelfMountingHoleDiameter * 5.5, "Holes not possible. Either decrease hole diameter or increase width")
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assertGreaterThanOrEq(width, wallMountingHoleDiameter * 5.5, "Holes not possible. Either decrease hole diameter or increase width")
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// Create the body of the bracket
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bracketBody = startSketchOn(XZ)
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|> startProfileAt([0, 0], %)
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|> xLine(length = shelfMountLength - thickness, tag = $seg01)
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|> yLine(length = thickness, tag = $seg02)
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|> xLine(length = -shelfMountLength, tag = $seg03)
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|> yLine(length = -wallMountLength, tag = $seg04)
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|> xLine(length = thickness, tag = $seg05)
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|> line(endAbsolute = [profileStartX(%), profileStartY(%)], tag = $seg06)
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|> close()
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|> extrude(%, length = width)
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// Add mounting holes to mount to the shelf
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shelfMountingHoles = startSketchOn(bracketBody, seg03)
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|> circle(
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center = [
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-(bendRadius + shelfMountingHolePlacementOffset),
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shelfMountingHolePlacementOffset
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],
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radius = shelfMountingHoleDiameter / 2,
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)
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|> patternLinear2d(instances = 2, distance = -(extBendRadius + shelfMountingHolePlacementOffset) + shelfMountLength - shelfMountingHolePlacementOffset, axis = [-1, 0])
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|> patternLinear2d(instances = 2, distance = width - (shelfMountingHolePlacementOffset * 2), axis = [0, 1])
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|> extrude(%, length = -thickness - .01)
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// Add mounting holes to mount to the wall
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wallMountingHoles = startSketchOn(bracketBody, seg04)
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|> circle(
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center = [
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wallMountLength - wallMountingHolePlacementOffset - bendRadius,
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wallMountingHolePlacementOffset
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],
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radius = wallMountingHoleDiameter / 2,
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)
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|> patternLinear2d(instances = 2, distance = width - (wallMountingHolePlacementOffset * 2), axis = [0, 1])
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|> extrude(%, length = -thickness - 0.1)
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// Apply bends
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fillet(bracketBody, radius = extBendRadius, tags = [getNextAdjacentEdge(seg03)])
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fillet(bracketBody, radius = bendRadius, tags = [getNextAdjacentEdge(seg06)])
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// Apply corner fillets
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fillet(
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bracketBody,
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radius = filletRadius,
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tags = [
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seg02,
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getOppositeEdge(seg02),
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seg05,
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getOppositeEdge(seg05)
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],
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)
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