110 lines
3.1 KiB
OpenSCAD
110 lines
3.1 KiB
OpenSCAD
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// Headlamp bracket to mount lamp to nylon strap v1
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// requires tweaking of plateScale when changing strap width
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// v2 TODO:
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// autoscale plate geometry with strapwidth, light cant
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// headcurve is janky
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// downward light angle
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lCant = 20;
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// clipin angle
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clipRot = -30;
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// clip length:
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clipLength = 29;
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// light diameter, testing at 0.25 below measured for tightness?
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lDiam = 20.75;
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// clip tightness, use 0.8 (tight) to 0.99 (no retention)
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clippiness = 0.85;
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// plate thick
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plateThick = 7;
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// plate scale - how many times cliplength, affected by strap and cant
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// 2.7 seems right for 25mm strap, 1.9 for 20mm strap
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plateScale = 1.5;
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// strap width
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strapWide = 21;
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// strap thickness try 3mm
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strapThick = 2.1;
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// head curve, puts slight curve in head side
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hcRad = 400;
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hcDepth = 4.8;
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minkRad = 2;
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$fn = 20;
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// mechanical interface facets should be high when printing
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interfaceFacets = 35;
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// lop off several things, each gets comment
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difference(){
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minkowski(){
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// union of plate and clip
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union(){
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//clip
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// translate so back hits yz plane
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translate([ (1.2 * lDiam / 2), -5, 0]){
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// rotate for cant
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rotate([lCant, 0, 0]){
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// rotate clip entry
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rotate([0, 0, clipRot]){
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color("Green"){
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difference(){
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// outer clip diameter account mink
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cylinder(d = 1.2 * lDiam, 2 * clipLength, center = true);
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// minus light diam account mink
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cylinder(d = lDiam + minkRad, 99, center = true, $fn = interfaceFacets);
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// minus clip entry account mink, the cube y dimension coefficient is clip clippiness, try 0.8-0.95
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translate([44, 0, 0]){
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cube([88, clippiness * (lDiam + minkRad), 99], center = true);
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}
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} // end diff
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}
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} // rot clip
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} // rot cant
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} // trans in xy
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// begin plate:
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rotate([0, -90, 0]){
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linear_extrude(plateThick - minkRad - plateThick / 2, scale = 1.15){
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// this polygon adjusts to cant angle and clip length
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polygon([ [0, 0], [clipLength * cos(lCant), -1 * clipLength * sin(lCant)], [plateScale * clipLength, strapWide + 7] , [0, strapWide + 7] ]);
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}
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}
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} // un
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// this does the fillets
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sphere(r = minkRad);
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}
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// cut off below xy plane
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translate([0, 0, -22]){
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cube([99, 99, 44], center = true);
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}
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// cut off back of plate channel for strap
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translate([-43.5 - minkRad, strapWide / 2 + 8, 0]){
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cube([88, strapWide, 222], center = true);
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}
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// add top slot
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translate([-2, strapWide / 2 + 8, (plateScale + 1) / 1.95 * clipLength * cos(lCant)]){
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rotate([0, 45, 0]){
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cube([16, strapWide, strapThick], center = true);
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}
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}
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// add bottom slot
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translate([-2, strapWide / 2 + 8, strapWide / 2]){
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rotate([0, -45, 0]){
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cube([16, strapWide, strapThick], center = true);
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}
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}
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// head curve
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translate([-1 * hcRad - plateThick + hcDepth, 0, (strapWide / 2 + (plateScale + 1) / 1.95 * clipLength * cos(lCant)) / 2 ]){
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rotate([90, 0, 0]){
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cylinder(r = hcRad, 99, center = true, $fn = 300);
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}
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}
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} // plane diff
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