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layer_height=0.2; extrusion_width=0.45;
epsilon=0.01;
$fs=0.125;
draft=true;
use <threads.scad>;
module pushfit_thread(h=10) {
thr = 3/8 + .5/25.4;
slit = 25.4*thr/2 + 0.2;
if(draft) cylinder(d=thr*25.4,h=h);
else english_thread(diameter=thr,threads_per_inch=28,length=h/25.4,internal=true);
translate([-2,-slit,0]) cube([4,2*slit,h]);
}
module the_mixer(
pushfit_d = 10, pushfit_h = 10,
pushfit_id = 6,
pushfit_type = "threaded", // threaded|embedded|embeddest
pushfit_ring_h = 4.7, // height of embedded pushfit ring
pushfit_insert_d = 8, // diameter of pushfit insert legs hole
pushfit_legspace_h = 3.2, // the height of legspace for embeddest variant
pushfit_inlet_ch = 1, // inlet chamfer
liner_d = 4, liner_id = 2, // ptfe liner inner and outer diameters
filament_d = 1.75,
join_angle = 30,
joint = "wide", // wide|narrow
interpushfit = 2*extrusion_width, // space between two pushfit holes
pushfit_s = 2, // shell around pushfit holes
output_l = 4, // length of output liner after before pushfit
outer_r = 3, // outer radius
liner_d_tolerance = .2,
filament_d_tolerance = .25
) {
fnd = PI*2*2; fnr = fnd*2;
ld = liner_d+liner_d_tolerance;
fd = filament_d+filament_d_tolerance;
linero = ld/2/tan(join_angle/2); // liner offset
jd = (joint=="narrow") ? fd : ld; // joint diameter
jo = (joint=="narrow") ? jd/2/tan(join_angle/2) : linero; // joint offset
pfrx = interpushfit/2/cos(join_angle/2); // radial margin
pfR = pushfit_d/2+pfrx; // radius of pushfit with margin
// offset of pushfit offset
pfoo = (pushfit_type=="threaded") ? 0 :
(pushfit_type=="embedded") ? (pushfit_h-pushfit_ring_h) :
(pushfit_type=="embeddest") ? 0 : undef;
pfo = pfR/tan(join_angle/2)-pfoo; // pushfit thread ofset
h = pushfit_d+pushfit_s*2;
module liner(l,in,offset=0,linero) {
lo = linero==undef ? l/2 : linero;
translate([0,0,offset])
if(joint=="narrow") {
$fn = max(fd,ld,jd)*fnd;
cylinder(d=fd,h=l);
//if(in=="top") cylinder(d1=jd,d2=fd,h=(jd-fd)/2);
translate([0,0,lo])
cylinder(d=ld,h=l-lo);
if(in=="bottom") translate([0,0,lo+epsilon]) mirror([0,0,1])
cylinder(d1=(liner_id+ld)/2,d2=fd,h=(liner_id+ld-fd)/2);
}else{
inh=ld-liner_id;
union() {
translate([0,0,inh])
cylinder(d=ld,h=l-inh,$fn=ld*fnd);
translate([0,0,-epsilon])
cylinder(d1=ld+epsilon,d2=liner_id-epsilon,h=inh+2*epsilon,$fn=ld*fnd);
}
}
}
module pushfit() {
if(pushfit_type=="threaded") {
pushfit_thread(h=pushfit_h);
}else if(pushfit_type=="embedded") {
translate([0,0,pushfit_h-pushfit_ring_h])
cylinder(d=pushfit_d,h=pushfit_ring_h,$fn=fnd);
cylinder(d=pushfit_insert_d,h=pushfit_h,$fn=pushfit_insert_d*fnd);
}else if(pushfit_type=="embeddest") {
cylinder(d=pushfit_id,h=pushfit_h+1,$fn=pushfit_insert_d*fnd);
cylinder(d=pushfit_d,h=pushfit_legspace_h,$fn=pushfit_d*fnd);
dd = (pushfit_d-pushfit_id)/2;
translate([0,0,pushfit_legspace_h-epsilon])
cylinder(d1=pushfit_d,d2=pushfit_id-2*epsilon,h=dd+epsilon,$fn=pushfit_d*fnd);
translate([0,0,pushfit_h-pushfit_inlet_ch-epsilon])
cylinder(d1=pushfit_id-2*epsilon,d2=pushfit_id+2*pushfit_inlet_ch+2,h=pushfit_inlet_ch+epsilon+1,$fn=(pushfit_id+2*pushfit_inlet_ch+2)*fnd);
}
}
difference() {
hull() {
for(s=[-1,1]) {
rotate([0,0,s*join_angle/2])
for(ss=[-1,1])
translate([ss*pushfit_d/2,pfo+pushfit_h-outer_r-epsilon])
cylinder(r=outer_r,h=h,center=true,$fn=outer_r*fnr);
translate([s*pushfit_d/2,-output_l-pushfit_h+outer_r+epsilon,0])
cylinder(r=outer_r,h=h,center=true,$fn=outer_r*fnr);
}
}
for(s=[-1,1]) rotate([0,0,s*join_angle/2]) {
rotate([-90,0,0])
liner(l=pfo-jo+epsilon,in="bottom",offset=jo);
translate([0,pfo,0]) rotate([-90,0,0])
pushfit();
}
rotate([90,0,0]) {
liner(l=output_l+epsilon,in="top",linero=0);
//cylinder(d=ld,h=output_l+1,$fn=ld*fnd);
translate([0,0,output_l])
pushfit();
}
hull() {
for(s=[-1,1]) rotate([0,0,s*join_angle/2]) {
rotate([-90,0,0])
translate([0,0,jo])
cylinder(d=jd,h=epsilon,$fn=jd*fnd);
}
rotate([90,0,0])
cylinder(d=jd,h=epsilon,$fn=jd*fnd);
}
}
}
module this() {
the_mixer(
pushfit_type="embeddest",
pushfit_d = 8,
pushfit_h = 7,
interpushfit = extrusion_width,
joint = "narrow"
);
}
if(!false) {
difference() {
this();
cylinder(d=100,h=100);
}
}else
this();
|
