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bushing.scad
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bushing.scad
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// PRUSA iteration3
// Bushing/bearing housings
// GNU GPL v3
// Josef Pr?ša <[email protected]>
// Václav 'ax' H?la <[email protected]>
// http://www.reprap.org/wiki/Prusa_Mendel
// http://github.com/prusajr/PrusaMendel
include <configuration.scad>
// ensure that the part length is at least the length of bushing barrel plus add
function adjust_bushing_len(conf_lb, h, add=layer_height*2) = ((conf_lb_length(conf_lb)+add) > h) ? conf_lb_length(conf_lb)+add : h;
//distance from the flat side of bushing holder to rod center
function bushing_foot_len(conf_lb, h=10.5, add=bushing_clamp_outer_radius_add) = ((conf_lb_out_dia(conf_lb)/2+add) > h) ? conf_lb_out_dia(conf_lb)/2+add : h;
function bushing_clamp_outer_radius(conf_lb) = conf_lb_out_dia(conf_lb)/2 + bushing_clamp_outer_radius_add;
// basic building blocks, housings for 1 bushing/bearing
// at [0,0] there is center of the smooth rod, pointing in Z
module linear_bushing_negative_single(conf_lb=bushing_x, h=0){
// barrel with the dimensions of a bushing/bearing
// to be substracted as needed
translate([0, 0, -0.01]) cylinder(r = conf_lb_out_dia(conf_lb)/2, h = adjust_bushing_len(conf_lb, h) + 0.02);
}
module linear_bearing_negative_single(conf_lb=bushing_x, h=0){
// as above but moved by 3 layers up
cylinder_poly(r = conf_lb_out_dia(conf_lb)/2, h = adjust_bushing_len(conf_lb, h) + 0.02,center=true);
}
module linear_bushing_single(conf_lb=bushing_x, h=0) {
// This is the printed barrel around bushing
// with foot pointing to -x
translate([-bushing_foot_len(conf_lb), -7, 0]) cube([bushing_foot_len(conf_lb), 14, adjust_bushing_len(conf_lb, h)]);
cylinder_poly(r=bushing_clamp_outer_radius(conf_lb), h=adjust_bushing_len(conf_lb, h));
}
module linear_bushing_negative(conf_lb=bushing_x, h=0){
// return simple negative stretched all along and a smooth rod
translate([0,0,-0.1]) cylinder(r = conf_lb_rod_dia(conf_lb)/2 + single_wall_width, h=adjust_bushing_len(conf_lb, h)+0.2);
linear_bushing_negative_single(conf_lb, h=adjust_bushing_len(conf_lb, h));
}
module linear_bearing_negative(conf_lb = bushing_x, h = 0){
//same as linear_bushing_negative, but with z direction constrained parts
cylinder_poly(r = conf_lb_rod_dia(conf_lb)/2 + single_wall_width, h=adjust_bushing_len(conf_lb, h, bushing_retainer_add)+0.2,center=true);
//lower bearing
linear_bearing_negative_single(conf_lb);
if (h > 2*conf_lb_length(conf_lb) + bushing_retainer_add){
translate([0,0,- (h-bushing_retainer_add-conf_lb_length(conf_lb))/2]) linear_bearing_negative_single(conf_lb);
translate([0,0,(h-bushing_retainer_add-conf_lb_length(conf_lb))/2]) mirror([0,0,1]) linear_bearing_negative_single(conf_lb);
}
}
module linear_negative_preclean(conf_lb = bushing_x) {
// makes sure there is nothing interfering
// to be substracted before linear()
cylinder(r = conf_lb_out_dia(conf_lb)/2 + single_wall_width, h=300, center=true);
}
module linear_bushing_sloped(conf_lb=bushing_x, h= 100){
// cut the bushing at angle, so it can be printed upside down
intersection(){
linear_bushing_single(conf_lb, h = h);
// hardcoded, may need fixing for different barelled bushings
// atm there is only one and I am too lazy
translate([0, 0, -2]) rotate([0,-50,0]) cube([30, 40, 80], center=true);
}
}
module linear_bushing(conf_lb=bushing_x, h=0, wide_base=false){
// this is the function to be used for type 1 linears (barrel holder)
// It has bushing on bottom and for parts longer than 3x the barel length on top too
difference() {
union() {
translate([-bushing_foot_len(conf_lb), -7, 0]) cube([2, 14, adjust_bushing_len(conf_lb, h)]);
linear_bushing_single(conf_lb);
if (h>3*conf_lb_length(conf_lb)) {
translate([0,0,h]) mirror([0,0,1]) linear_bushing_sloped(conf_lb);
}
}
linear_bushing_negative(conf_lb, h);
}
}
module linear_bearing(conf_lb=bushing_x, h=0, wide_base=false){
clamp_length=adjust_bushing_len(conf_lb, h, bushing_retainer_add);
difference() {
union() {
difference() {
union(){
//main block
//translate([-bushing_foot_len(conf_lb), -7, 0]) cube([4, 14, adjust_bushing_len(conf_lb, h, 9*layer_height)]); <- removed for duplicity:)
cylinder_poly(h = clamp_length, r=bushing_clamp_outer_radius(conf_lb), center=true);
difference() {
union() {
translate([0,0,-h/2]) bearing_clamp_bevel(conf_lb,w=2*bushing_clamp_outer_radius(conf_lb), h=clamp_length);
if (h > 2*conf_lb_length(conf_lb) + bushing_retainer_add || conf_lb_length(conf_lb) > 45) {
translate([0,0, (h-bushing_retainer_add-conf_lb_length(conf_lb))/2]) translate([screw_dia(v_screw_hole(screw_M3_socket_head,$fn=8, horizontal=true)) / 2 + conf_lb_out_dia(conf_lb)/2 + 0.3, 0, 0]) rotate([90,0, 0]) screw_trap(l=2*bushing_clamp_outer_radius(conf_lb), screw=screw_M3_socket_head, nut=nut_M3, add_inner_support=1, outer_radius_add=2, $fn=8, horizontal=true);
translate([0,0, -(h-bushing_retainer_add-conf_lb_length(conf_lb))/2]) translate([screw_dia(v_screw_hole(screw_M3_socket_head,$fn=8, horizontal=true)) / 2 + conf_lb_out_dia(conf_lb)/2 + 0.3, 0, 0]) rotate([90,0, 0]) screw_trap(l=2*bushing_clamp_outer_radius(conf_lb), screw=screw_M3_socket_head, nut=nut_M3, add_inner_support=1, outer_radius_add=2, $fn=8, horizontal=true);
}
else {
translate([screw_dia(v_screw_hole(screw_M3_socket_head,$fn=8, horizontal=true)) / 2 + conf_lb_out_dia(conf_lb)/2 + 0.3, 0, 0]) rotate([90,0, 0]) screw_trap(l=2*bushing_clamp_outer_radius(conf_lb), screw=screw_M3_socket_head, nut=nut_M3, add_inner_support=1, outer_radius_add=2, $fn=8, horizontal=true);
}
}
if (h > 2*conf_lb_length(conf_lb) + bushing_retainer_add || conf_lb_length(conf_lb) > 45) {
translate([0,0, (h-bushing_retainer_add-conf_lb_length(conf_lb))/2]) translate([screw_dia(v_screw_hole(screw_M3_socket_head,$fn=8)) / 2 + conf_lb_out_dia(conf_lb)/2 + 0.3, 0, 0]) rotate([90,0, 0])
screw_nut_negative(l=2*bushing_clamp_outer_radius(conf_lb)+4, screw=screw_M3_socket_head, nut=nut_M3, nut_drop=2, head_drop=2, washer_type=washer_M3, $fn=8, center=true, horizontal=true);
translate([0,0, -(h-bushing_retainer_add-conf_lb_length(conf_lb))/2]) translate([screw_dia(v_screw_hole(screw_M3_socket_head,$fn=8)) / 2 + conf_lb_out_dia(conf_lb)/2 + 0.3, 0, 0]) rotate([90,0, 0])
screw_nut_negative(l=2*bushing_clamp_outer_radius(conf_lb)+4, screw=screw_M3_socket_head, nut=nut_M3, nut_drop=2, head_drop=2, washer_type=washer_M3, $fn=8, center=true, horizontal=true);
}
else {
translate([screw_dia(v_screw_hole(screw_M3_socket_head,$fn=8)) / 2 + conf_lb_out_dia(conf_lb)/2 + 0.3, 0, 0]) rotate([90,0, 0])
screw_nut_negative(l=2*bushing_clamp_outer_radius(conf_lb)+4, screw=screw_M3_socket_head, nut=nut_M3, nut_drop=2, head_drop=2, washer_type=washer_M3, $fn=8, center=true, horizontal=true);
}
translate ([-(bushing_clamp_outer_radius(conf_lb)/2), 0, 0]) cube([bushing_clamp_outer_radius(conf_lb), bushing_clamp_outer_radius(conf_lb)*2 , h+1],center=true);
}
}
//main axis
translate([0,0,-2]) cylinder_poly(h = clamp_length+10, r=conf_lb_out_dia(conf_lb)/2,center=true);
//main cut
translate([0, -conf_lb_out_dia(conf_lb)/2+1, -(clamp_length+1)/2]) cube([30, 2*conf_lb_out_dia(conf_lb)/2-2, clamp_length+1]);
}
difference() {
if (wide_base) {
union () {
difference() {
translate([-bushing_foot_len(conf_lb), -(conf_lb_out_dia(conf_lb)/2+bushing_clamp_outer_radius_add), -clamp_length/2]) cube([conf_lb_out_dia(conf_lb)/2+bushing_clamp_outer_radius_add+0.1, (conf_lb_out_dia(conf_lb)/2+bushing_clamp_outer_radius_add)*2, clamp_length]);
cylinder_poly(r=conf_lb_out_dia(conf_lb)/2+0.1, h=clamp_length+1, center=true);
}
translate([-bushing_foot_len(conf_lb), -7, -clamp_length/2]) cube([4, 14, clamp_length]);
}
}
else
{
translate([-bushing_foot_len(conf_lb), -7, -clamp_length/2]) cube([4, 14, clamp_length]);
}
linear_negative(conf_lb, clamp_length);
}
}
translate([-bushing_foot_len(conf_lb)-3.5, -(conf_lb_out_dia(conf_lb)/2+bushing_clamp_outer_radius_add)-0.5, -(clamp_length+1)/2]) cube([4, (conf_lb_out_dia(conf_lb)/2+bushing_clamp_outer_radius_add)*2+1, clamp_length+1]);
}
}
// this should be more parametric
module firm_foot(conf_lb, hole_spacing=x_end_bushing_mount_hole_spacing, foot_thickness=z_bushing_mount_thickness, h=z_bushing_foot_height, mounting_screw=z_bushing_mounting_screw, width_add=14, four_holes=true){
difference(){
union() {
translate([foot_thickness/2,0,0]) cube_fillet([foot_thickness, hole_spacing+width_add, h], center=true, vertical=[2,2,2,2]);
}
if (four_holes) {
translate([foot_thickness, hole_spacing/2, h/2-6]) rotate([0, -90, 0]) screw_hole(type=mounting_screw, head_drop=0, allowance=screw_hole_allowance_horizontal*2.5, $fn=8);
translate([foot_thickness,-hole_spacing/2, h/2-6]) rotate([0,-90,0]) screw_hole(type=mounting_screw, head_drop=0, allowance=screw_hole_allowance_horizontal*2.5, $fn=8);
translate([foot_thickness, hole_spacing/2, -h/2+6]) rotate([0, -90, 0]) screw_hole(type=mounting_screw, head_drop=0, allowance=screw_hole_allowance_horizontal*2.5, $fn=8);
translate([foot_thickness,-hole_spacing/2, -h/2+6]) rotate([0,-90,0]) screw_hole(type=mounting_screw, head_drop=0, allowance=screw_hole_allowance_horizontal*2.5, $fn=8);
}
else {
translate([foot_thickness, hole_spacing/2, 0]) rotate([0, -90, 0]) screw_hole(type=mounting_screw, head_drop=0, allowance=screw_hole_allowance_horizontal*2.5, $fn=8);
translate([foot_thickness,-hole_spacing/2, 0]) rotate([0,-90,0]) screw_hole(type=mounting_screw, head_drop=0, allowance=screw_hole_allowance_horizontal*2.5, $fn=8);
}
}
}
module linear_bearing_clamp_with_foot(conf_lb=bushing_z, foot_thickness=z_bushing_mount_thickness, foot_height=z_bushing_foot_height, hole_spacing=x_end_bushing_mount_hole_spacing, center=false, four_holes=true){
translate ([0,0,(center) ? 0 : foot_height/2])
union() {
difference() {
union() {
translate([-13+0.05, 0, 0]) firm_foot(conf_lb, foot_thickness=foot_thickness, hole_spacing=hole_spacing, h=foot_height, four_holes=four_holes);
if (conf_lb_length(conf_lb) > 45) {
translate([-bushing_foot_len(conf_lb), 0, adjust_bushing_len(conf_lb, 45) - 8]) mirror([0, 0, 1]) firm_foot(conf_lb);
}
}
linear_negative_preclean(conf_lb = conf_lb);
}
linear(conf_lb= conf_lb, center=true, h=foot_height);
}
}
module bearing_clamp_bevel(conf_lb=bushing_x, w=0, h=bushing_x[2]+bushing_retainer_add){
translate ([(conf_lb_out_dia(conf_lb)/2+nut_outer_dia(v_nut_hole(nut_M3)))/2.65+0.3,0,h/2])
cube([conf_lb_out_dia(conf_lb)/2+nut_outer_dia(v_nut_hole(nut_M3))/1.39+0.3, w, h], center=true);
}
module z_linear_bearing_clamp(){
linear_bearing_clamp_with_foot(conf_lb=bushing_z, foot_thickness=z_bushing_mount_thickness, foot_height=z_bushing_foot_height, hole_spacing=x_end_bushing_mount_hole_spacing, center=false, four_holes=true);
}
module y_linear_bearing_clamp(){
linear_bearing_clamp_with_foot(conf_lb=bushing_y, foot_thickness=y_bushing_mount_thickness, foot_height=bushing_y[2]+bushing_retainer_add, hole_spacing=y_bushing_mount_hole_spacing, center=false, four_holes=false);
}
// old version, too weak.
/*
module bearing_clamp_bevel(conf_lb=bushing_x, w1=0, w2=0, h=bushing_x[2]+bushing_retainer_add){
translate ([(conf_lb_out_dia(conf_lb)/2+nut_outer_dia(v_nut_hole(nut_M3)))/2.65+0.3,0,h/2])
rotate([0,90,0])
trapezoid(cube=[h, w1, conf_lb_out_dia(conf_lb)/2+nut_outer_dia(v_nut_hole(nut_M3))/1.39+0.3], x1=0, x2=0, y1=(w1-w2)/2, y2=(w1-w2)/2, center=true);
}
*/
module linear_negative(conf_lb = bushing_x, h = 0){
//selects right negative based on type
if (conf_lb_type(conf_lb) == 0) {
linear_bearing_negative(conf_lb, h);
} else {
linear_bushing_negative(conf_lb, h);
}
}
module linear(conf_lb = bushing_x, h = bushing_x[2]+bushing_retainer_add, center=false, wide_base=false){
//selects right negative based on type
translate ([0,0,(center) ? 0 : h/2]) {
if (conf_lb_type(conf_lb) == 0) {
linear_bearing(conf_lb, h, wide_base);
} else {
linear_bushing(conf_lb, h, wide_base);
}
%linear_negative(conf_lb, h);
}
}
//linear_bearing(conf_lb=bushing, h=bushing_holder_height);
//translate([0,0,(bushing_x[2]+bushing_retainer_add)/2])
//z_linear_bearing_clamp();
//linear(conf_lb = bushing_x, center=true, wide_base=true);
//translate([0,52,0]) bearing_clamp2(w1=30,w2=20 );
//linear(bushing_x, 86);
linear(conf_b = bushing_x, center=true, wide_base=true);