139 lines
4.3 KiB
OpenSCAD
139 lines
4.3 KiB
OpenSCAD
/* Some common screw dimensions and helper functions/modules */
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include <./math.scad>
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include <./common.scad>
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/********************************************************************************/
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// M3 dimensions
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m3HoleRadiusSlack = 0.4; // higher slack for not-so straight heat set inserts
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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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m3CounterSunkHeadRadius = 3;
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m3CounterSunkHeadLength = 1.7;
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m3HexNutWidthAcrossFlats = 5.41;
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m3HexNutWidthAcrossCorners = FtoG(m3HexNutWidthAcrossFlats);
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m3HexNutThickness = 2.2;
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m3HeatSetInsertSlotRadiusSlack = -0.1;
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m3HeatSetInsertSlotHeightSlack = 0.5;
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m3HeatSetInsertSlotRadius = 2.3;
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m3HeatSetInsertSlotHeight = 5.7;
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m3HeatSetInsertSlotRadiusSlacked = m3HeatSetInsertSlotRadius+m3HeatSetInsertSlotRadiusSlack;
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m3HeatSetInsertSlotHeightSlacked = m3HeatSetInsertSlotHeight+m3HeatSetInsertSlotHeightSlack;
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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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module heatSetInsertSlot_N(screwType, topExtension=inf50) {
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if (screwType == "m3") {
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union() {
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// actual slot for insert
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cylinder(h = m3HeatSetInsertSlotHeightSlacked, r = m3HeatSetInsertSlotRadiusSlacked);
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// extra space above slot to help with insertion
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translate(v=[0, 0, m3HeatSetInsertSlotHeightSlacked])
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cylinder(h = topExtension, r = m3HeatSetInsertSlotRadiusSlacked);
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}
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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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function heatSetInsertSlotRadiusSlacked(screwType) =
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(screwType == "m3")
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? m3HeatSetInsertSlotRadiusSlacked
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: error("Unsupported screw type");
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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 counterSunkHead_N(screwType, screwExtension=0, headExtension=0) {
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if (screwType == "m3") {
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translate(v=[0,0,-m3CounterSunkHeadLength])
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union() {
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cylinder(r1 = m3RadiusSlacked, r2 = m3CounterSunkHeadRadius, h = m3CounterSunkHeadLength);
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translate(v = [0, 0, -screwExtension])
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cylinder(r = m3RadiusSlacked, h = screwExtension);
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translate(v = [0, 0, m3CounterSunkHeadLength])
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cylinder(r = m3CounterSunkHeadRadius, h = headExtension);
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}
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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 hexNut(screwType) {
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if (screwType == "m3") {
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translate(v=[0,0,-m3HexNutThickness/2])
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difference() {
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cylinder(r=m3HexNutWidthAcrossCorners/2, h=m3HexNutThickness, $fn=6);
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cylinder(r=m3Radius,h=inf10);
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}
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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 hexNutPocket_N(screwType, openSide=true) {
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if (screwType == "m3") {
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hexNutPocketHelper_N(m3RadiusSlacked, m3HexNutWidthAcrossCorners / 2 + 0.3, m3HexNutThickness + 0.3, openSide=openSide);
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} else if (screwType == "m4") {
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hexNutPocketHelper_N(m4RadiusSlacked, m4HexNutWidthAcrossCorners / 2 + 0.1, m4HexNutThickness + 0.2, openSide=openSide);
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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(innerRadius, widthAcrossCorners, thickness, openSide=true) {
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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 = [inf50, 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 = inf50, $fn = 32);
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if (openSide) {
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hull() {
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translate(v = [inf50, 0, 0])
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cylinder(r = innerRadius, h = inf50, $fn = 32);
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cylinder(r = innerRadius, h = inf50, $fn = 32);
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}
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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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