/* [Preview] */
// Enable preview of the crosssection.
print_view = 1; // [0:Cutted_view, 1:Print_view]
/*[Ball Bearing Dimensions]*/
// Height of the bearing.
height = 12.7;
// Inner ring radius. Half of the diameter.
inner_radius = 127.0; //[2:0.5:150]
// Inner ring radius. Half of the diameter.
outer_radius = 146.05; //[5:0.5:500]
// Radii of the inner and outer ring touching the housing and axis.
edge_radius = 0.5; //[0.0:0.1:2.0]
// Dimension of the rolling element.
ball_radius = 2; //[1:0.5:10]
// Edge Radii of the rolling element.
ball_edge_radius = 0.3; //[0.0:0.1:2.0]
/* [Spacing] */
// Space between the rolling element and each ring.
space_ball_rings = 0.2; //[0.0:0.05:0.5]
// Minimum space between the rolling elements. Effects the number of rolling elements.
min_space_between_balls = 0.25; //[0.0:0.05:1.0]
// Clearance between height of the rings and the height rolling elements.
ball_height_space = 0.0; //[0.0:0.2:2.0]
/* [Guidance] */
// Ratio of height of the guidance elevation.
guide_size_ratio = 0.5; //[0.1:0.05:1.0]
// Elevation of the guidance element.
ball_guide_height = 0.8; //[0.1:0.1:10]
/*[Calculated Variables]*/
radi_diff = outer_radius - inner_radius;
ball_pos_radius = radi_diff/2 + inner_radius;
length_ball_pos_line = 2 * PI * ball_pos_radius;
num_balls = floor(length_ball_pos_line/(ball_radius*2+min_space_between_balls));
ball_angle_step = 360/num_balls;
guide_height = height * guide_size_ratio/2;
if (print_view==1) {
bearing();
} else {
difference() {
bearing();
translate([outer_radius/2, -outer_radius/2, height/2])
cube([outer_radius,outer_radius, height+1], center=true);
}
}
module bearing() {
translate([0,0,height/2])
union() {
rotate_extrude($fn = 64) {
translate([ball_pos_radius,0,0])
union() {
difference(){
minkowski(){
square([radi_diff-2*edge_radius,height-2*edge_radius], center=true);
circle(r = edge_radius, $fn=16);
}
square([(ball_radius+space_ball_rings)*2, height + 1], center=true);
}
difference() {
for (angle = [0:180:180]) {
rotate([0,0,angle])
translate([(ball_radius+space_ball_rings),0,0])
difference() {
rotate([0,0,45])
square(guide_height*sqrt(2), center=true);
translate([guide_height,0,0])
square(guide_height*2,center=true);
}
}
square([(ball_radius+space_ball_rings-ball_guide_height)*2, height + 1], center=true);
}
}
}
for (angle_ball = [0 : ball_angle_step : 360]) {
rotate([0,0,angle_ball])
translate([ball_pos_radius,0,0])
rotate_extrude($fn = 32) {
union() {
translate([(ball_radius/2),0,0])
difference() {
minkowski(){
square([(ball_radius-2*ball_edge_radius), height-2*ball_height_space-2*ball_edge_radius], center=true);
circle(r = ball_edge_radius, $fn=4);
}
translate([(ball_radius/2),0,0])
rotate([0,0,45])
square(guide_height*sqrt(2), center=true);
}
translate([((ball_radius-ball_guide_height)/2),0,0])
square([(ball_radius-ball_guide_height), height-ball_height_space*2], center=true);
}
}
}
}
}
