114 lines
2.5 KiB
OpenSCAD
114 lines
2.5 KiB
OpenSCAD
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/* Some common screw dimensions */
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inf = 400; // basically infinity
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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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// legacy TODO: replace
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m3ptr = m3RadiusSlacked;
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// NUTS!
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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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module m3HexNutPocketNegative() {
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hexNutPocketNegative(m3RadiusSlacked,
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m3HexNutWidthAcrossCorners/2 + 0.1,
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m3HexNutThickness + 0.2);
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}
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// TODO: remove test
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*difference() {
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cube(size=[8,12,5], center=true);
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rotate(a=[0,0,20])
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m3HexNutPocketNegative();
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}
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*m3HexNutPocketNegative();
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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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module m4HexNutPocketNegative() {
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hexNutPocketNegative(m4RadiusSlacked,
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m4HexNutWidthAcrossCorners/2 + 0.1,
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m4HexNutThickness + 0.2);
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}
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// TODO: remove test
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*difference() {
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translate(v=[0,1,0])
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cube(size=[10,12,6], center=true);
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rotate(a=[0,0,20])
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m4HexNutPocketNegative();
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}
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*m4HexNutPocketNegative();
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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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module hexNutPocketNegative(
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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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