81 lines
2.3 KiB
OpenSCAD
81 lines
2.3 KiB
OpenSCAD
/* Some common screw dimensions and helper functions/modules */
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inf = 400;
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/********************************************************************************/
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// M3 dimensions
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m3HoleRadiusSlack = 0.15;
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m3Diameter = 3.0;
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m3Radius = m3Diameter / 2.0;
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m3RadiusSlacked = m3Radius + m3HoleRadiusSlack;
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m3HexNutWidthAcrossFlats = 5.41;
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m3HexNutWidthAcrossCorners = FtoG(m3HexNutWidthAcrossFlats);
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m3HexNutThickness = 2.18;
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/********************************************************************************/
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// M4 dimensions
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m4HoleRadiusSlack = 0.15;
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m4Diameter = 4.0;
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m4Radius = m4Diameter / 2.0;
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m4RadiusSlacked = m4Radius + m4HoleRadiusSlack;
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m4HexNutWidthAcrossFlats = 6.89;
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m4HexNutWidthAcrossCorners = FtoG(m4HexNutWidthAcrossFlats);
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m4HexNutThickness = 3.07;
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/********************************************************************************/
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function screwRadiusSlacked(screwType) =
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(screwType == "m3")
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? m3RadiusSlacked
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: (screwType == "m4")
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? m4RadiusSlacked
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: error("Unsupported screw type");
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module hexNutPocket_N(screwType) {
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if (screwType == "m3") {
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hexNutPocketHelper_N(m3RadiusSlacked,
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m3HexNutWidthAcrossCorners / 2 + 0.1,
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m3HexNutThickness + 0.2);
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} else if (screwType == "m4") {
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hexNutPocketHelper_N(m4RadiusSlacked,
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m4HexNutWidthAcrossCorners / 2 + 0.1,
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m4HexNutThickness + 0.2);
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} else {
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error("Unsupported screw type");
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}
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}
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module hexNutPocketHelper_N(
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innerRadius,
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widthAcrossCorners,
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thickness)
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{
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union() {
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hull() {
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// hexagonal cylinder representing where the nut should fit
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cylinder(r = widthAcrossCorners, h = thickness, center = true, $fn = 6);
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// negative volume for sliding in the nut
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translate(v = [inf, 0, 0])
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cylinder(r = widthAcrossCorners, h = thickness, center = true, $fn = 6);
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}
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// negative volume for screw lead
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translate(v = [0, 0, - 10])
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cylinder(r = innerRadius, h = inf, $fn = 32);
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hull() {
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translate(v = [inf, 0, 0])
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cylinder(r = innerRadius, h = inf, $fn = 32);
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cylinder(r = innerRadius, h = inf, $fn = 32);
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}
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}
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}
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// Convert a regular hexagon widthAcrossFlats to widthAcrossCorners
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function FtoG(widthAcrossFlats) = widthAcrossFlats * (2 / sqrt(3));
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// Convert a regular hexagon widthAcrossCorners to widthAcrossFlats
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function GtoF(widthAcrossCorners) = widthAcrossCorners * (sqrt(3) / 2);
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