122 lines
5.5 KiB
Markdown
Executable File
122 lines
5.5 KiB
Markdown
Executable File
This is the source code for the float switch 3d printed parts for the
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water level detector for the [Cheap Chinese
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Laser](Cheap_Chinese_Laser "wikilink"). It is made in two parts: the
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head and the base. You also need 4 pieces of 1/4-20 all thread to
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connect the two of them and 8 nuts. The base is internally threaded. The
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head needs nuts top and bottom. Washers would be good too.
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rendered on 5/1/2017
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rendered on 5/7/2017
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/*
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low water level detector
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safety interlock for cheap Chinese laser at Hac DC
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This water level detector is a two piece assembly connected by threaded rod. This model uses 1/4-20 rod. The lower foot has a 40mm home in the bottom to insert a pingpong ball as the float.
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James Sullivan
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5-8-17
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Mk 5 - removed tolerance variable and adjusted threads, ppbd, and head threaded rod holes diameters
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OpenSCAD version 2015.03-1
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*/
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ppbd=41; //ping pong ball diameter, includes 1mm tolerance
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ppbw=2.7; //ping pong ball weight in grams
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shd=2; //switch hole diameter
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shp=10; //switch hole pitch, i.e. center to center spacing of mounting holes on microswitch
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wlh=200; //water level height
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sbw=6; //switch body width
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nfw=4; //nut face width, switch mounting nuts
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nt=1; //nut thickness, switch mounting nuts
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thick=5; //thickness
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eps=0.1; //epsilon
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br=50; //base radius
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rod=25.4/4; //rod outer diameter
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tpi=20; //threads per inch
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td=13.74/tpi; //thread depth
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fph=25.4*5/tpi;//foot pillar height
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bfw=ppbd+2*thick; //base flange width
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$fn=48;
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function mod(num,den) = num - floor(num/den)*den;
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//dimensions taken from Front Door Switch Holder
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wr=4; //wrench size for nuts width across flats
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nh=1; //nut height, depth of nut sockets
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//head
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module head() {
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color("cyan") difference(){
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union(){
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for(angle=[45:90:315]){
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rotate([0,0,angle]) translate([ppbd/2+rod/2+td,0,0]) cylinder(d=rod+thick*2,h=thick); //leg cylinders
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}
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cylinder(h=thick,r=ppbd/2+rod/2+td-thick/2);
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}
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translate([0,0,-thick/2]) cylinder(h=thick*2,r=ppbd/2+rod/2-3*thick/2); //center bore to reduce material amount and print time
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for(angle=[45:90:315]){
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rotate([0,0,angle]) translate([ppbd/2+rod/2+td,0,-thick/2]) cylinder(d=rod*1.1,h=thick*2); //leg holes for threaded rods
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}
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}
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translate([sbw/2,(ppbd+rod-2*thick)/(-2),0]) cube([thick,ppbd+rod-2*thick,thick]); //support for switch mounting block
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translate([sbw/2,shp/2,thick]) difference(){ //switch mounting block, aligned with z-plane and x-plane, centered on y-plane
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translate([0,-shp/2-nfw,0]) color("green") cube([thick,shp+2*nfw,2*nfw]);
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for (y=[-shp/2,shp/2]) {
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translate([thick/2,y,nfw]) rotate([0,90,0]) cylinder(d=shd,h=thick*2,center=true); //screw holes
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translate([sbw-nh,y,nfw]) union(){ //nut sockets
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for (ang=[0,120,240]) rotate([ang,0,0]) cube([nh*2,wr,wr/sqrt(3)],center=true);
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}
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}
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translate([sbw/2+thick,bfw/2-nfw-shp,nfw]) union(){ //center nut socket
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cube([nh*2,wr,wr/sqrt(3)],center=true);
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rotate([120,0,0]) cube([nh*2,wr,wr/sqrt(3)],center=true);
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rotate([240,0,0]) cube([nh*2,wr,wr/sqrt(3)],center=true);
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}
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}
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}
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module socket(nd,tpi,tl,thick) {
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//nd = nominal diameter
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//tpi = threads per inch
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//tl = thread length
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ror=nd/2; //rod outer radius
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pitch=25.4/tpi; //thread pitch in mm
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td=13.74/tpi; //thread depth in mm
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rir=ror-td; //rod inner radius
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sor=ror+thick; //socket outer radius
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vert= [for (ang=[0:360/$fn:720]) ang<=90 ? [cos(ang),sin(ang)]*rir :
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ang<202.5 ? [cos(ang),sin(ang)]*(rir+td*(ang-90)/112.5) :
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ang<=247.5 ? [cos(ang),sin(ang)]*ror :
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ang<360 ?[cos(ang),sin(ang)]*(rir+td*(360-ang)/112.5) :
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[cos(ang),sin(ang)]*sor];
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path1=[for(p=[0:$fn]) p<$fn ? p : 0 ];
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path2=[for(p=[$fn:2*$fn]) p<2*$fn ? p : $fn ];
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color("green") difference(){
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linear_extrude(height=tl,center=false,convexivity=20,twist=tl/25.4*tpi*360){
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polygon(points=vert,paths=[path1,path2]);
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}
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translate([0,0,tl-ror*tan(30)]) cylinder(r2=ror,r1=0,h=ror*tan(30)); //inlet chamfer
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}
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}
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//foot
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module foot(){
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difference(){
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union(){
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translate([0,0,thick/2]) cube([ppbd+2*thick,ppbd+2*thick,thick],center=true);
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for (angle=[45:90:315]){
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rotate([0,0,angle]){
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translate([ppbd/2+rod/2+13.74/tpi,0,thick]) socket(rod*1.1,tpi,fph,thick); //pillar
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translate([0,-thick,0]) cube([br-thick,thick*2,thick]); //leg
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translate([br-thick,0,0]) cylinder(r=thick,h=thick); //foot
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} //end rotate
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} //end for
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} //end union
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translate([0,0,-eps/2]) cylinder(d=ppbd,h=fph+eps+thick); //ping pong ball entry
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} //end difference
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} //end foot module
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//head();
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foot();
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[Category: CheapChineseLaser](Category:_CheapChineseLaser "wikilink") |