| -rw-r--r-- | another.scad | 28 |
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); |