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116 lines
4.2 KiB
OpenSCAD
116 lines
4.2 KiB
OpenSCAD
//
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// Mendel90
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//
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// GNU GPL v2
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// nop.head@gmail.com
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// hydraraptor.blogspot.com
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//
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// Holds the idler pulley
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//
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include <conf/config.scad>
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use <y-motor-bracket.scad>
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slot = 10;
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axel_height = y_motor_height() + pulley_inner_radius - ball_bearing_diameter(Y_idler_bearing) / 2;
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base_thickness = 5;
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wall = default_wall;
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clearance = 1;
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dia = washer_diameter(M5_penny_washer) + 2 * clearance;
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tab_length = washer_diameter(screw_washer(base_screw)) + 2 * clearance + slot;
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length = dia + wall + tab_length;
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function y_idler_clearance() = dia / 2 + slot;
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function y_idler_offset() = dia / 2 + wall + tab_length;
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width = (wall + washer_thickness(M5_penny_washer) + washer_thickness(M4_washer) + ball_bearing_width(Y_idler_bearing)) * 2;
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back_width = washer_diameter(screw_washer(base_screw)) + 2 * clearance + 2 * wall;
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height = axel_height + dia / 2;
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module y_idler_bracket_stl() {
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stl("y_idler_bracket");
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color(y_idler_bracket_color) intersection() {
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difference() {
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rotate([90, 0, 90])
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linear_extrude(height = width, center = true) //side profile
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hull() {
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translate([0, axel_height])
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circle(dia / 2);
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translate([-dia / 2 , 0])
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square([length, base_thickness]); // base
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square([dia / 2 + wall, height]); // upright
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}
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translate([0, - dia / 2, height + base_thickness]) // cavity for bearing
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rotate([0, 90, 0])
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rounded_rectangle(size = [height * 2, dia * 2, width - 2 * wall], r = dia / 2);
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translate([0, dia / 2 + wall + tab_length / 2 + eta, height / 2 + base_thickness + eta]) // cavity for screw slot
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cube([back_width - 2 * wall, tab_length, height], center = true);
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translate([0, dia / 2 + wall + slot / 2 + washer_diameter(screw_washer(base_screw)) / 2 + clearance , 0]) // screw slot
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rotate([0,0,90])
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slot(r = screw_clearance_radius(base_screw), l = slot, h = 2 * base_thickness + 1, center = true);
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translate([0, 0, axel_height]) // hole for axel
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rotate([90, 0, 90])
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teardrop_plus(r = M4_clearance_radius, h = width + 1, center = true);
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}
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union() { // plan profile
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translate([0, (length - tab_length) / 2 - dia / 2, -1])
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rounded_rectangle([width - eta, length - tab_length - eta, height + 2], r = 2, center = false);
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translate([0, length - (tab_length + 5) / 2 - dia / 2 - eta, -1])
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rounded_rectangle([back_width, tab_length + 5, height + 2], r = 2, center = false);
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}
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}
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}
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module y_idler_screw_hole()
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translate([0, dia / 2 + wall + tab_length / 2 - slot / 2,0])
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child();
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module y_idler_assembly() {
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assembly("y_idler_assembly");
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color(y_idler_bracket_color) render() y_idler_bracket_stl();
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translate([0, 0, axel_height]) rotate([0, -90, 0]) {
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for(side = [-1, 1]) {
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translate([0, 0, (ball_bearing_width(Y_idler_bearing) / 2) * side])
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ball_bearing(BB624);
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translate([0, 0, ball_bearing_width(Y_idler_bearing) * side])
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rotate([0, side * 90 - 90, 0])
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washer(M4_washer);
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translate([0, 0, (ball_bearing_width(Y_idler_bearing) + washer_thickness(M4_washer)) * side])
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rotate([0, side * 90 - 90, 0])
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washer(M5_penny_washer);
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}
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translate([0, 0, width / 2])
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screw_and_washer(M4_cap_screw, 40); // could be 30mm but would be the only one, 40 is used on the idler
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translate([0, 0, -width / 2])
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rotate([180, 0, 0])
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nut_and_washer(M4_nut, true);
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}
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y_idler_screw_hole()
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translate([0, 0, base_thickness])
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base_screw();
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end("y_idler_assembly");
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}
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if(1)
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y_idler_assembly();
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else
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y_idler_bracket_stl();
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