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-rw-r--r--another.scad28
1 files changed, 2 insertions, 26 deletions
diff --git a/another.scad b/another.scad
index 2331003..9ff7f6a 100644
--- a/another.scad
+++ b/another.scad
@@ -1,510 +1,486 @@
draft=true;
layer_height=0.2; extrusion_width=0.4;
epsilon=0.01;
$fs=0.0125;
use <pushfittery.scad>;
include <pushfit_data.scad>;
module the_extruder(
// motor properties
gearbox_d = 36,
mount_d = 28, // the distance between opposite mounting holes
mounthole_depth = 5,
mounthole_min_depth = 3, mounthole_max_depth = 4,
protrusion_d = 22, protrusion_h = 2.2, // the dimensions of the protrusion on top of gearbox
bore_d = 8, bore_l = 17.6,
bore_dd = 7,
// pulley properties
pulley_d = 11.5, pulley_h=10,
pulley_elevation = 1, // pulley elevation above the protrusion
teeth_elevation = 7.5, // distance from the bottom of the pulley to its teeth
filament_offset = (8.25-(3.0+3.5)/2) - 11.5/2 + 1.75/2,
// idler properties
idler_d = 9.5, idler_h = 4, idler_id = 3, // idler dimensions: outer and inner diameters and height
// spring properties
spring_d = 10, spring_lc = 9.6, // spring diameter and compressed length
// filament path properties
filament_d = 1.75,
filament_path_d = 2,
filament_guide_d = 4, // PTFE filament guide diameter
// knob properties
knob_h = 10,
knob_bore_l = 4,
knob_indent_d = 4,
knob_indents = 12,
// spring tensioner
st_nut_d = 9, st_nut_h = 4,
st_screw_d = 5,
st_thickshell = 8*extrusion_width, st_thinshell = 4*extrusion_width,
// screw it
mount_screw_d = 3.1, mount_screw_l = 20,
mount_screwhead_d=6, mount_screwhead_h=3,
idler_screw_d = 3,
idler_screwhead_d=6, idler_screwhead_h=3,
pf = pushfit_embeddest,
pf_shell = max(3*layer_height,3*extrusion_width),
pf_smooth = true,
// empty spaces
idler_travel = 3, // how far should idler travel when pressed
idler_clearance=1,
pulley_d_clearance=2,
pulley_small_d_clearance=0.5,
lever_v_clearance=.7, // vertical clearance for the lever
spring_d_clearance=1,
protrusion_tolerance_h=.5, // horizontal tolerance for the motor protrusion
protrusion_tolerance_v=.5, // vertical tolerance for the motor protrusion
mount_screw_d_tolerance=.4,
idler_v_tolerance=.5,
knob_bore_d_tolerance=.6,
st_nut_h_tolerance=.2,
st_nut_d_tolerance=.2,/* TODO: make it st_nut_w_tolerance */
st_screw_d_tolerance=.5,
st_split_w_tolerance = .3,
min_z_shell = 4*layer_height, // the very minimal shell thickness along z-axis.
min_xy_shell = 2*extrusion_width,
what="lever", // lever|body|knob|springpad|*
left=false,
vitamins = true,
- supports = false, bridges = true,
+ bridges = true,
tensioner = true,
debug = false
) {
fnd = 2*PI; fnr = 2*fnd;
idler_filament_offset = filament_path_d/2; // -filament_offset;
lever_shell = mount_screwhead_h+0.5;
lever_thickness=max(spring_d+spring_d_clearance+layer_height*8,idler_h+idler_v_tolerance+2*lever_shell);
lsd = idler_d-idler_clearance*2; // the diameter of lever thingie
longwing=(mount_d+mount_screw_d+mount_screw_d_tolerance+spring_d+spring_d_clearance)/2+min_xy_shell;
shortwing = let(a=mount_d/2,c=(pulley_d+idler_d)/2/sqrt(2))
sqrt(c*c+pow(a-c,2));
longwing_travel = idler_travel*longwing/shortwing;
h_ = (pulley_d+idler_d)/(2*sqrt(2));
ri = sqrt( pow(h_,2) + pow(mount_d/2-h_,2) );
spring_dl = idler_travel*longwing/ri;
// finger and spring support
fsw = gearbox_d-(gearbox_d-mount_d)/2-max(spring_lc,longwing_travel+(gearbox_d-mount_d)/2);
mount_min_depth = mounthole_min_depth ? mounthole_min_depth : mounthole_depth-1;
mount_max_depth = mounthole_max_depth ? mounthole_max_depth : mounthole_depth+1;
filament_elevation=protrusion_h+pulley_elevation+teeth_elevation;
ls_z = filament_elevation; // leverspace mid-z
ls_h = lever_thickness+lever_v_clearance; // leverspace height
mount_depth = mount_screw_l - (ls_z+ls_h/2+min_z_shell);
body_h = max(protrusion_h+bore_l,mount_screw_l-mount_depth+mount_screwhead_h+min_z_shell,ls_z*2);
echo("mount depth",mount_depth);
module teardrop(r,d,h,center=false,angle=45) {
dd = d ? d : (2*r);
$fn = dd*fnd;
cylinder(d=dd,h=h,center=center);
if(angle>0) translate([0,0,center?-h/2:0])
rotate([0,0,angle])
cube(size=[d/2,d/2,h]);
}
module mirrorleft() {
mirror([left?0:1,0,0]) children();
}
module place_idler() {
rotate([0,0,45])
translate([(pulley_d+idler_d)/2,0,0])
children();
}
module finger_indent(d=lever_thickness,depth/*=1*/,r/*=15*/) {
if(depth) {
hh = (-4*pow(depth,2)+pow(d,2))/(8*depth);
rr = depth+hh;
translate([0,0,hh]) sphere(r=rr,$fn=fnr*rr);
}else if(r) {
hh=sqrt(pow(r,2)-pow(d,2)/4);
translate([0,0,hh]) sphere(r=r,$fn=fnr*r);
}
}
% if(vitamins) mirrorleft() {
translate([0,0,-epsilon]) mirror([0,0,1]) cylinder(d=gearbox_d,h=1,$fn=60);
for(zr=[0:90:359]) rotate([0,0,zr]) translate([mount_d/2,0,0])
cylinder(d=mount_screw_d,h=20,$fn=30);
translate([0,0,-epsilon]) cylinder(d=protrusion_d,h=protrusion_h,$fn=30);
translate([0,0,protrusion_h]) {
difference() {
cylinder(d=bore_d,h=bore_l,$fn=30);
translate([-bore_d/2-1,bore_dd-bore_d/2,-1])
cube([bore_d+2,bore_d/2,bore_l+2]);
}
translate([0,0,pulley_elevation]) {
cylinder(d=pulley_d,h=pulley_h,$fn=30);
translate([0,0,teeth_elevation]) {
place_idler() {
cylinder(d=idler_d,h=idler_h,center=true,$fn=30);
cylinder(d=idler_screw_d,h=lever_thickness+2,center=true,$fn=30);
}//place idler
// filament path
rotate([0,0,45]) {
translate([pulley_d/2-idler_filament_offset,0,0]) rotate([90,0,0]) {
cylinder(d=filament_d,h=gearbox_d,center=false,$fn=15);
}//rotate translate
translate([pulley_d/2+filament_offset,0,0]) rotate([-90,0,0]) {
cylinder(d=filament_d,h=gearbox_d,center=false,$fn=15);
translate([0,0,mount_d/sqrt(2)/2+mount_screw_d])
pushfit(pf);
}//rotate translate
}//rotate
}//translate teeth
}//translate pulley
}//translate protrusion
}//vitamins
module lever() {
translate([0,0,protrusion_h+pulley_elevation+teeth_elevation]) {
difference() {
union() {
hull() {
place_idler()
cylinder(d=lsd,h=lever_thickness,center=true,$fn=60);
translate([mount_d/2,0,0])
cylinder(d=lsd,h=lever_thickness,center=true,$fn=60);
}//hull
hull() {
translate([mount_d/2,0,0])
cylinder(d=lsd,h=lever_thickness,center=true,$fn=60);
translate([mount_d/2,-longwing,0]) rotate([0,90,0])
cylinder(d=lever_thickness,h=lsd,center=true,$fn=60);
}//hull
}//union
// filament path
place_idler()
translate([-idler_d/2-idler_filament_offset,0,0])
rotate([90,0,0]) {
mirror([0,1,0])
teardrop(d=filament_path_d,h=3*gearbox_d,center=true);
translate([0,0,
sqrt(2)*(mount_d-pulley_d+lsd)/2
]) {
cylinder(d1=filament_path_d,d2=2*filament_path_d,
h=filament_path_d,$fn=2*filament_path_d*fnd);
translate([0,0,filament_path_d-epsilon])
cylinder(d=2*filament_path_d,h=lsd*sqrt(2),$fn=2*filament_path_d*fnd);
}//translate
}//rotate translate place_idler
// idler space and mounting hole
place_idler() {
- difference() {
- cylinder(d=idler_d+idler_clearance*2,h=idler_h+idler_v_tolerance,center=true,$fn=60);
- if(supports) for(y=[-lsd/2+extrusion_width:(lsd-2*extrusion_width)/3:lsd/2-extrusion_width])
- translate([-lsd/2-1,y-extrusion_width/2,-idler_h/2-idler_v_tolerance/2-1])
- cube(size=[lsd+2,extrusion_width,idler_h+idler_v_tolerance+2]);
- }
+ cylinder(d=idler_d+idler_clearance*2,h=idler_h+idler_v_tolerance,center=true,$fn=60);
cylinder(d=idler_screw_d,h=lever_thickness+2,center=true,$fn=30);
translate([0,0,lever_thickness/2-idler_screwhead_h])
cylinder(d=idler_screwhead_d,h=idler_screwhead_h+1,$fn=fnd*idler_screwhead_d);
}
// mounting screw hole
translate([mount_d/2,0,0])
cylinder(d=mount_screw_d+mount_screw_d_tolerance,h=lever_thickness+2,center=true,$fn=fnd*mount_screw_d);
// lever end
translate([mount_d/2,0,0]) rotate([0,90,0]) {
translate([0,-longwing,lsd/2]) finger_indent(d=lever_thickness-1,r=15);
translate([0,-longwing,0])
mirror([0,0,1])
difference() {
cylinder(d=spring_d+spring_d_clearance,h=lsd,$fn=fnd*(spring_d+spring_d_clearance));
sphere(d=spring_d*3/4,$fn=fnd*spring_d*3/4);
}
}//rotate-translate
}//difference
// bridging patch
if(bridges) place_idler()
translate([0,0,lever_thickness/2-mount_screwhead_h])
mirror([0,0,1])
cylinder(d=mount_screwhead_d,h=layer_height);
}//translate
}//lever module
module body() {
difference() {
union() {
cylinder(d=gearbox_d,h=body_h,$fn=fnd*gearbox_d);
// spring tensioner part
translate([-gearbox_d/2,0,0]) hull() {
translate([0,-longwing,ls_z])
rotate([0,90,0])
cylinder(d=lever_thickness,h=fsw,$fn=fnd*lever_thickness);
hh=body_h-ls_z;
translate([0,0,ls_z])
mirror([0,1,0]) cube(size=[fsw,longwing+(st_thinshell+st_split_w_tolerance)/2+st_thickshell,body_h-ls_z]);
hhh=ls_z;
translate([0,0,0])
mirror([0,1,0]) cube(size=[fsw,longwing-hhh+lever_thickness/sqrt(2),hhh+lever_thickness/2]);
}//hull translate
// pushfit bracket
translate([0,0,filament_elevation])
rotate([0,0,45]) translate([pulley_d/2+filament_offset,0,0])
rotate([-90,0,0])
translate([0,0,mount_d/sqrt(2)/2+mount_screw_d-gearbox_d/2/*TODO:*/]) {
pfbl = pf_h(pf)+gearbox_d/2; //TODO:
if(pf_smooth) {
pfbd = pf_d(pf)+2*pf_shell;
hull() {
cylinder(d=pfbd,h=pfbl,$fn=pfbd*fnd);
translate([-epsilon/2,0,0]) {
cube(size=[epsilon,filament_elevation,pfbl-filament_elevation+pfbd/2]);
mirror([0,1,0])
cube(size=[epsilon,body_h-filament_elevation,pfbl-body_h+filament_elevation+pfbd/2]);
}//translate
}//hull
}else{
pfb2a = pf_d(pf)+2*pf_shell; pfba = pfb2a/2;
pfbd = pfb2a/cos(30);
pfbs = pfb2a*tan(30);
cylinder(d=pfbd,h=pfbl,$fn=6);
translate([-pfbs/2,0,0]) {
hull() {
translate([0,-pfba,0]) cube(size=[pfbs,pfb2a,pfbl]);
cube(size=[pfbs,filament_elevation,pfbl-filament_elevation+pfba]);
mirror([0,1,0])
cube(size=[pfbs,body_h-filament_elevation,pfbl-body_h+filament_elevation+pfba]);
}//hull
}//translate*/
}//if(pf_smooth)
}//translate rotate translate rotate translate
}//union (first child of difference)
// protrusion
translate([0,0,-1])
cylinder(d=protrusion_d+protrusion_tolerance_h,h=protrusion_h+protrusion_tolerance_v+1,$fn=fnd*(protrusion_d+protrusion_tolerance_h));
// mount screw holes
for(zr=[0:90:359]) rotate([0,0,zr]) translate([mount_d/2,0,0]) {
translate([0,0,mount_screw_l-mount_depth-(bridges?layer_height:-epsilon)])
mirror([0,0,1])
cylinder(d=mount_screw_d+mount_screw_d_tolerance,
h=mount_screw_l-mount_depth+1,
$fn=fnd*(mount_screw_d+mount_screw_d_tolerance));
translate([0,0,mount_screw_l-mount_depth])
cylinder(d=mount_screwhead_d,h=body_h+1,$fn=fnd*mount_screwhead_d);
}//for
// pushfit
pf_offset = mount_d/sqrt(2)/2+mount_screw_d;
translate([0,0,filament_elevation])
rotate([0,0,45]) translate([pulley_d/2+filament_offset,0,0])
rotate([-90,0,0])
translate([0,0,pf_offset])
rotate([0,0,180]) {
pushfit(pf);
mirror([0,0,1]) {
fh = 1.5* (filament_guide_d-filament_path_d)/2;
fo = pf_offset -filament_path_d /*(idler_d+idler_clearance)/2*/-fh;
translate([0,0,-1]) teardrop(d=filament_guide_d,h=fo/2,angle=225);
translate([0,0,-1]) teardrop(d=filament_path_d,h=gearbox_d/2+1,angle=-225);
translate([0,0,fo+epsilon])
cylinder(d1=filament_path_d,d2=filament_guide_d,h=fh,$fn=fnd*filament_guide_d);
}//mirror
}//rotate translate rotate translate rotate translate
// pulley
cylinder(d=pulley_d+pulley_small_d_clearance,h=body_h+1,$fn=fnd*(pulley_d+pulley_d_clearance));
cylinder(d=pulley_d+pulley_d_clearance,ls_z-max(idler_h,filament_guide_d)/2,$fn=fnd*(pulley_d+pulley_d_clearance));
translate([0,0,ls_z-ls_h/2]) {
// idler travel
translate([mount_d/2,0,0])
rotate([0,0,45])
rotate_extrude(angle=90,$fn=fnr*(shortwing+(idler_d+idler_clearance)/2))
square([shortwing+(idler_d+idler_clearance)/2,ls_h]);
// idler itself
place_idler()
cylinder(d=idler_d+idler_clearance,h=ls_h,$fn=fnd*(idler_d+idler_clearance));
// lever space
rotate([0,0,45])
rotate_extrude(angle=-135+max(atan(2*fsw/gearbox_d-1),atan(gearbox_d/mount_d-1)))
square([gearbox_d/2+1,ls_h]);
}
// back side cutout
// XXX: this is somewhat ugly and potentially bugged,
// but I want to sleep.
a0_ = atan(
(mount_d/sqrt(2)/2+mount_screw_d+pf_h(pf)+gearbox_d/2)
/
(
pulley_d/2+filament_offset-
(pf_d(pf)+2*pf_shell)/2/cos(30)
)
);
a0 = -135 + ( (a0_>0) ? a0_ : 180+a0_ );
a1 = atan((longwing-lever_thickness/2)/(gearbox_d/2));
translate([0,0,ls_z]) difference() {
rotate([0,0,-180+a0])
rotate_extrude(angle=a1-a0)
translate([0,-ls_h/2])
square([sqrt(pow(gearbox_d/2,2)+pow(longwing-lever_thickness/2,2))+1,
ls_h]);
translate([-mount_d/2,0,0])
cylinder(d=gearbox_d-mount_d,h=ls_h+2,center=true,$fn=fnd*(gearbox_d-mount_d));
}//difference translate
//translate([-mount_d/2,-longwing,filament_elevation])
if(!tensioner) /* XXX: this seems to be bullshit, but it's so old, that it's historical bullshit */
translate([mount_d/2,-longwing,filament_elevation])
rotate([0,-90,0]) difference() {
cylinder(d=spring_d+spring_d_clearance,h=spring_lc+spring_dl,$fn=fnd*(spring_d+spring_d_clearance));
translate([0,0,spring_lc+spring_dl]) sphere(d=spring_d*3/4,$fn=fnd*spring_d*3/4);
}
// spring tensioner
translate([-gearbox_d/2,-longwing,ls_z]) rotate([0,-90,0]) {
if(!tensioner) finger_indent(d=lever_thickness-1,r=15); else {
mirror([0,0,1]) {
translate([0,0,st_thickshell])
hull() for(o=[0,spring_d]) translate([0,-o,0])
rotate([0,0,30])
cylinder(d=st_nut_d+st_nut_d_tolerance,h=st_nut_h+st_nut_h_tolerance,$fn=6);
translate([0,0,-1]) cylinder(d=st_screw_d+st_screw_d_tolerance,h=fsw+2,$fn=fnd*(st_screw_d+st_screw_d_tolerance));
bigd = spring_d+spring_d_clearance;
hf = (bigd-st_screw_d-st_screw_d_tolerance)/2;
translate([0,0,st_thickshell+st_nut_h+st_nut_h_tolerance+st_thinshell-epsilon]) {
cylinder(d1=st_screw_d+st_screw_d_tolerance,d2=bigd,
h=hf+epsilon, $fn=fnd*bigd);
translate([0,-(st_thinshell+st_split_w_tolerance)/2,0])
cube(size=[body_h-ls_z+1,st_thinshell+st_split_w_tolerance,fsw+1]);
}
translate([0,0,st_thickshell+st_nut_h+st_nut_h_tolerance+st_thinshell+hf-epsilon])
cylinder(d=bigd,h=fsw+1,$fn=fnd*bigd);
}
}
}
}//difference
- if(supports) intersection() {
- difference() {
- translate([0,0,ls_z-ls_h/2-epsilon])
- cylinder(d=gearbox_d,h=ls_h+2*epsilon,$fn=fnd*gearbox_d);
- cylinder(d=pulley_d+pulley_d_clearance,h=body_h+1,$fn=fnd*(pulley_d+pulley_d_clearance));
- }
- // supports
- // TODO: hardcoded stuff below…
- if(false) { // parallel
- for(y=[-gearbox_d:4:gearbox_d])
- translate([0,y-extrusion_width/2,0])
- cube(size=[gearbox_d,extrusion_width,body_h]);
- }else{ // radial
- for(zr=[-65:(65+50)/7:50])
- rotate([0,0,zr]) translate([0,-extrusion_width/2,0])
- cube(size=[gearbox_d,extrusion_width,body_h]);
- }
- }
-
}//body module
module springpad() {
smalld=st_screw_d+st_screw_d_tolerance+min_xy_shell;
bigd = spring_d+spring_d_clearance/2;
hf = (bigd-smalld)/2;
h = hf*3.5;
translate([-gearbox_d/2+st_thickshell+st_nut_h+st_nut_h_tolerance+st_thinshell+1,-longwing,filament_elevation])
rotate([0,90,0]) difference() {
union() {
cylinder(d1=smalld,d2=bigd,h=hf,$fn=fnd*bigd);
translate([0,0,hf-epsilon])
cylinder(d=bigd,h=h-hf,$fn=fnd*bigd);
translate([0,0,h])
sphere(d=spring_d*3/4,$fn=fnd*spring_d*3/4);
l = body_h-ls_z;
w = st_thinshell;
hull() translate([0,-st_thinshell/2,0]) mirror([1,0,0]) {
translate([0,0,w])
cube(size=[l,st_thinshell,w]);
cube(size=[l-w,st_thinshell,2*w]);
}
}
translate([0,0,-epsilon])
cylinder(d=st_screw_d+st_screw_d_tolerance,h=2*hf+epsilon,$fn=fnd*(st_screw_d+st_screw_d_tolerance));
}
}
module knob() {
ch = knob_indent_d/2;
translate([0,0,body_h+epsilon]) {
mirror([0,0,1]) translate([0,0,-epsilon]) {
difference() {
cylinder(d=pulley_d,h=knob_bore_l,$fn=fnd*pulley_d);
translate([0,0,-1]) difference() {
cylinder(d=bore_d+knob_bore_d_tolerance,h=knob_bore_l+2);
translate([-bore_d/2-1,bore_dd-bore_d/2+knob_bore_d_tolerance/2,-1])
cube([bore_d+2,bore_d/2,knob_bore_l+4]);
}
}
}
difference() {
union() {
cylinder(d1=gearbox_d-2*ch,d2=gearbox_d,h=ch+epsilon,$fn=fnd*gearbox_d);
translate([0,0,ch])
cylinder(d=gearbox_d,h=knob_h-2*ch+epsilon,$fn=fnd*gearbox_d);
translate([0,0,knob_h-ch])
cylinder(d1=gearbox_d,d2=gearbox_d-2*ch,h=ch,$fn=fnd*gearbox_d);
}
for(a=[0:360/knob_indents:359]) rotate([0,0,a])
translate([0,gearbox_d/2,-1])
cylinder(d=knob_indent_d,h=knob_h+2,$fn=fnd*knob_indent_d);
}
}
}//knob module
module debug() {
difference() {
children();
if(debug) {
// spring tensioner debug cutout
if(tensioner) // TODO: collapse copypasted transformations
translate([-gearbox_d/2,0,0])
translate([0,-longwing,ls_z]) rotate([0,-90,0])
translate([0,-lever_thickness/2-1,-gearbox_d])
cube(size=[body_h/2+1,lever_thickness/2+1,gearbox_d+2]);
// lever axis debug cutout
translate([mount_d/2,0,-1])
rotate([0,0,-45])
cube(size=[gearbox_d-mount_d,gearbox_d-mount_d,body_h+knob_h+2]);
// idler debug cutout
translate([0,0,ls_z])
place_idler()
rotate([0,0,-45])
translate([0,0,-lever_thickness/2-epsilon])
cube(size=[(idler_d+idler_clearance)/2,(idler_d+idler_clearance)/2,
lever_thickness+2*epsilon]);
// pushfit debug cutout
place_idler()
translate([-idler_d/2+filament_offset,0,ls_z])
cube(size=[gearbox_d/2,gearbox_d/2+pf_h(pf),body_h-ls_z+1]);
}//if debug
}//difference
}
mirrorleft()
debug()
if(what=="lever") color("green",0.7) lever();
else if(what=="body") color("yellow",0.7) body();
else if(what=="knob") color("red",0.7) knob();
else if(what=="springpad") color("blue",0.7) springpad();
else if(what=="both") {
color("green",0.7) lever();
color("yellow",0.7) body();
}else{
color("green",0.7) lever();
color("yellow",0.7) body();
color("red",0.7) knob();
color("blue",0.7) springpad();
}
}
the_extruder(what="*",left=false,debug=true);