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Chris Palmer
2012-03-12 01:13:07 +00:00
commit d22174869f
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//
// Mendel90
//
// GNU GPL v2
// nop.head@gmail.com
// hydraraptor.blogspot.com
//
// Holds the idler pulley
//
include <conf/config.scad>
use <y-motor-bracket.scad>
slot = 10;
axel_height = y_motor_height() + pulley_inner_radius - ball_bearing_diameter(Y_idler_bearing) / 2;
base_thickness = 5;
wall = default_wall;
clearance = 1;
dia = washer_diameter(M5_penny_washer) + 2 * clearance;
tab_length = washer_diameter(screw_washer(base_screw)) + 2 * clearance + slot;
length = dia + wall + tab_length;
function y_idler_clearance() = dia / 2 + slot;
function y_idler_offset() = dia / 2 + wall + tab_length;
width = (wall + washer_thickness(M5_penny_washer) + washer_thickness(M4_washer) + ball_bearing_width(Y_idler_bearing)) * 2;
back_width = washer_diameter(screw_washer(base_screw)) + 2 * clearance + 2 * wall;
height = axel_height + dia / 2;
module y_idler_bracket_stl() {
stl("y_idler_bracket");
color([0,1,0]) intersection() {
difference() {
rotate([90, 0, 90])
linear_extrude(height = width, center = true) //side profile
hull() {
translate([0, axel_height])
circle(dia / 2);
translate([-dia / 2 , 0])
square([length, base_thickness]); // base
square([dia / 2 + wall, height]); // upright
}
translate([0, - dia / 2, height + base_thickness]) // cavity for bearing
rotate([0, 90, 0])
rounded_rectangle(size = [height * 2, dia * 2, width - 2 * wall], r = dia / 2);
translate([0, dia / 2 + wall + tab_length / 2 + eta, height / 2 + base_thickness + eta]) // cavity for screw slot
cube([back_width - 2 * wall, tab_length, height], center = true);
translate([0, dia / 2 + wall + slot / 2 + washer_diameter(screw_washer(base_screw)) / 2 + clearance , 0]) // screw slot
rotate([0,0,90])
slot(r = screw_clearance_radius(base_screw), l = slot, h = 2 * base_thickness + 1, center = true);
translate([0, 0, axel_height]) // hole for axel
rotate([90, 0, 90])
teardrop_plus(r = M4_clearance_radius, h = width + 1, center = true);
}
union() { // plan profile
translate([0, (length - tab_length) / 2 - dia / 2, -1])
rounded_rectangle([width - eta, length - tab_length - eta, height + 2], r = 2, center = false);
translate([0, length - (tab_length + 5) / 2 - dia / 2 - eta, -1])
rounded_rectangle([back_width, tab_length + 5, height + 2], r = 2, center = false);
}
}
}
module y_idler_screw_hole()
translate([0, dia / 2 + wall + tab_length / 2 - slot / 2,0])
child();
module y_idler_assembly() {
assembly("y_idler_assembly");
color([0,1,0]) render() y_idler_bracket_stl();
translate([0, 0, axel_height]) rotate([0, -90, 0]) {
for(side = [-1, 1]) {
translate([0, 0, (ball_bearing_width(Y_idler_bearing) / 2) * side])
ball_bearing(BB624);
translate([0, 0, ball_bearing_width(Y_idler_bearing) * side])
rotate([0, side * 90 - 90, 0])
washer(M4_washer);
translate([0, 0, (ball_bearing_width(Y_idler_bearing) + washer_thickness(M4_washer)) * side])
rotate([0, side * 90 - 90, 0])
washer(M5_penny_washer);
}
translate([0, 0, width / 2])
screw_and_washer(M4_cap_screw, 40); // could be 30mm but would be the only one, 40 is used on the idler
translate([0, 0, -width / 2])
rotate([180, 0, 0])
nut_and_washer(M4_nut, true);
}
y_idler_screw_hole()
translate([0, 0, base_thickness])
base_screw();
end("y_idler_assembly");
}
if(1)
y_idler_assembly();
else
y_idler_bracket_stl();