64 lines
2.6 KiB
OpenSCAD
64 lines
2.6 KiB
OpenSCAD
// Lawnmower washer square thing
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// length units are millimeters
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tolerance = 1.00;
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topMetalWasherLength = 45.00 + tolerance; // this is (basically) square
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innerShaftDiameter = 22.30;
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bulbsLength = 32.40;
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bulbsDiameter = 11.60;
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bladeWidth = 44.40 + tolerance;
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washerThickness = 2.00;
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metalWasherThickness = 3.46;
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bladeThickness = 2.24;
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minGuideRidgeThickness = 3.00;
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innerShaftRadius = innerShaftDiameter / 2;
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bulbRadius = bulbsDiameter / 2;
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washerLength = max(topMetalWasherLength, bladeWidth) + (minGuideRidgeThickness * 2);
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bladeRidgeThickness = max(minGuideRidgeThickness, (washerLength - bladeWidth) / 2);
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metalWasherRidgeThickness = max(minGuideRidgeThickness, (washerLength - topMetalWasherLength) / 2);
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circleResolution=360*4; // faces per rotation
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zFightingOffset=0.01; // offset for shape subtraction
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module shaft(height) {
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cylinder(r=innerShaftRadius, h=height, $fn=circleResolution);
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translate([-(bulbsLength - (bulbRadius * 2)) / 2,-bulbRadius,0])
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cube([bulbsLength - (bulbRadius * 2), bulbRadius * 2, height]);
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translate([innerShaftRadius, 0, 0])
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cylinder(r=bulbRadius, h=height, $fn=circleResolution);
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translate([-innerShaftRadius, 0, 0])
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cylinder(r=bulbRadius, h=height, $fn=circleResolution);
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}
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difference() {
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translate([-washerLength / 2, -washerLength / 2, 0]) {
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cube([washerLength, washerLength, washerThickness]);
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// blade ridges
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translate([0, washerLength / 2, washerThickness - zFightingOffset]) {
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translate([0, - (bladeWidth / 2) - bladeRidgeThickness,0])
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cube([washerLength, bladeRidgeThickness, bladeThickness]);
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translate([0, bladeWidth / 2,0])
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cube([washerLength, bladeRidgeThickness, bladeThickness]);
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}
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// metal washer ridges
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translate([washerLength / 2, 0, - washerThickness + zFightingOffset]) {
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translate([-(topMetalWasherLength / 2) - metalWasherRidgeThickness, 0,0])
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cube([metalWasherRidgeThickness, washerLength, metalWasherThickness]);
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translate([topMetalWasherLength / 2,0,0])
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cube([metalWasherRidgeThickness, washerLength, metalWasherThickness]);
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}
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}
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translate([0,0,-zFightingOffset])
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rotate([0,0,0])
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shaft(washerThickness + (zFightingOffset * 2));
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/*
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// blade stand-in
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translate([-50, -bladeWidth/2, washerThickness])
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#cube([100, bladeWidth, bladeThickness]);
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// top metal washer stand-in
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translate([-topMetalWasherLength/2, -topMetalWasherLength/2, -metalWasherThickness])
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#cube([topMetalWasherLength, topMetalWasherLength, metalWasherThickness]);
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*/
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} |