60 lines
1.8 KiB
OpenSCAD
60 lines
1.8 KiB
OpenSCAD
// all units are in inches
|
|
function mm_to_in(mm) = 0.03937 * mm;
|
|
bar_dims = [1.228, 0.228, 0.22];
|
|
bar_gap = 0.793;
|
|
bump_thickness = 0.009;
|
|
$fn = $preview ? 32 : 64;
|
|
// hole/peg dimensions
|
|
peg_od = 0.130; // snug fit against the footprint.
|
|
hole_id = 0.107;
|
|
peg_id = 0.100; // 0.005 larger than #2-56 nominal diameter
|
|
peg_height = mm_to_in(1.6);
|
|
peg_fullheight = 0.245 - bar_dims[2]; // height of the full circle wrap around.
|
|
|
|
|
|
insert_diameter = mm_to_in(3.5); // 3.2mm (d3 for #2-56 inserts)
|
|
insert_length = mm_to_in(6.1);
|
|
|
|
notch_height = 0.108; // height from top of bar to bottom of notch
|
|
notch_thickness = 0.0380 - 0.022; // how far the notch goes from the outer edge.
|
|
|
|
module nutbar_peg() {
|
|
difference() {
|
|
union() {
|
|
// cube
|
|
translate([0,0, bump_thickness/2])
|
|
cube([bar_dims[1], bar_dims[1], bar_dims[2] + bump_thickness], center = true);
|
|
// peg portion
|
|
translate([0,0,bump_thickness + bar_dims[2]/2])
|
|
|
|
difference() {
|
|
cylinder(h = peg_height, d = peg_od);
|
|
union() {
|
|
translate([0,0,-0.01])
|
|
cylinder(h = peg_height+0.02, d = peg_id);
|
|
translate([0,0,peg_fullheight])
|
|
cube([1,1,1]);
|
|
};
|
|
};
|
|
|
|
//
|
|
};
|
|
union() {
|
|
// threaded insert hole
|
|
translate([0,0,-1 * bar_dims[2]])
|
|
cylinder(h = insert_length + 0.01, d = insert_diameter);
|
|
cylinder(h = bar_dims[2] + 1, d = peg_id, center = true);
|
|
};
|
|
};
|
|
}
|
|
|
|
// create the cross bar bit
|
|
cube([bar_gap, bar_dims[1], bar_dims[2]], center=true);
|
|
|
|
translate([bar_gap/2 + bar_dims[1]/2, 0, 0])
|
|
rotate([0,0,90])
|
|
nutbar_peg();
|
|
|
|
translate([-1 * (bar_gap/2 + bar_dims[1]/2), 0, 0])
|
|
rotate([0,0,-90])
|
|
nutbar_peg(); |