73 lines
2.3 KiB
OpenSCAD
73 lines
2.3 KiB
OpenSCAD
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// all units are in inches
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bar_dims = [1.228, 0.228, 0.184];
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bump_thickness = 0.01;
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$fn = $preview ? 32 : 64;
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// hole/peg dimensions
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peg_od = 0.1315;
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hole_id = 0.107;
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peg_id = 0.091; // 0.005 larger than #2-56 nominal diameter
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peg_height = 0.405 - bar_dims[2];
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peg_fullheight = 0.245 - bar_dims[2]; // height of the full circle wrap around.
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function mm_to_in(mm) = 0.03937 * mm;
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insert_diameter = mm_to_in(3.2); // 3.2mm (d3 for #2-56 inserts)
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insert_length = mm_to_in(5.0);
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notch_height = 0.108; // height from top of bar to bottom of notch
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notch_thickness = 0.0380 - 0.0190; // how far the notch goes from the outer edge.
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module peg_notch() {
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// The peg notch is the notch that is used to hold the nut bar to the board.
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base_thick = 0.01;
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rotate([180, -90,0])
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linear_extrude(0.054, center = true) polygon([
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[0,0],
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[0,base_thick],
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[0,notch_thickness + base_thick],
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[0.1,base_thick],
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[0.1,0]
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]);
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}
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module nutbar_peg() {
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difference() {
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union() {
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// cube
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translate([0,0, bump_thickness/2])
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cube([bar_dims[1], bar_dims[1], bar_dims[2] + bump_thickness], center = true);
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// peg portion
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translate([0,0,bump_thickness + bar_dims[2]/2])
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union() {
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translate([0,- peg_od / 2 + 0.01, 0.1])
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peg_notch();
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difference() {
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cylinder(h = peg_height, d = peg_od);
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union() {
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translate([0,0,-0.01])
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cylinder(h = peg_height+0.02, d = peg_id);
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translate([0,0,peg_fullheight])
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cube([1,1,1]);
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};
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};
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}
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//
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};
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union() {
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// threaded insert hole
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translate([0,0,-1 * bar_dims[2]])
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cylinder(h = insert_length + 0.01, d = insert_diameter);
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cylinder(h = bar_dims[2] + 1, d = peg_id, center = true);
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};
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};
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}
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// create the cross bar bit
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cube([bar_dims[0] - 2 * bar_dims[1], bar_dims[1], bar_dims[2]], center=true);
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translate([bar_dims[0]/2 - 0.5 * bar_dims[1], 0, 0])
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rotate([0,0,90])
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nutbar_peg();
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translate([-1 * (bar_dims[0]/2 - 0.5 * bar_dims[1]), 0, 0])
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rotate([0,0,-90])
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nutbar_peg();
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