Float switch - Revision history

James: v5 update to adjust foot threads, etc.

2017-05-10T05:10:14Z

v5 update to adjust foot threads, etc.

← Older revision		Revision as of 05:10, 10 May 2017
Line 14:		Line 14:
	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.		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.
	James Sullivan		James Sullivan
	4-30-17		5-8-17
	Mk 2 - ~~calculated~~ threads		Mk 5 - removed tolerance variable and adjusted threads, ppbd, and head threaded rod holes diameters
	OpenSCAD version 2015.03-1		OpenSCAD version 2015.03-1
	*/		*/
	ppbd=40; //ping pong ball diameter		ppbd=41; //ping pong ball diameter, includes 1mm tolerance
	ppbw=2.7; //ping pong ball weight in grams		ppbw=2.7; //ping pong ball weight in grams
	shd=2; //switch hole diameter		shd=2; //switch hole diameter
Line 28:		Line 28:
	thick=5; //thickness		thick=5; //thickness
	eps=0.1; //epsilon		eps=0.1; //epsilon
	~~tol=0.5; //tolerance~~
	br=50; //base radius		br=50; //base radius
	rod=25.4/4; //rod outer diameter		rod=25.4/4; //rod outer diameter
	tpi=20; //threads per inch		tpi=20; //threads per inch
			td=13.74/tpi; //thread depth
	fph=25.4*5/tpi;//foot pillar height		fph=25.4*5/tpi;//foot pillar height
	bfw=ppbd+2*thick; //base flange width		bfw=ppbd+2*thick; //base flange width
	$fn=40;		$fn=48;
	function mod(num,den) = num - floor(num/den)*den;		function mod(num,den) = num - floor(num/den)*den;
	//dimensions taken from Front Door Switch Holder		//dimensions taken from Front Door Switch Holder
Line 42:		Line 42:
	//head		//head
	module head() {		module head() {
	difference(){		color("cyan") difference(){
	union(){		union(){
	for(angle=[45:90:315]){		for(angle=[45:90:315]){
	rotate([0,0,angle]) translate([ppbd/2+rod/2+~~tol~~,0,0]) cylinder(d=rod+thick*2,h=thick); //leg cylinders		rotate([0,0,angle]) translate([ppbd/2+rod/2+td,0,0]) cylinder(d=rod+thick*2,h=thick); //leg cylinders
	}		}
	cylinder(h=thick,r=ppbd/2+rod/2+~~tol~~-thick/2);		cylinder(h=thick,r=ppbd/2+rod/2+td-thick/2);
	}		}
	translate([0,0,-thick/2]) cylinder(h=thick2,r=ppbd/2+rod/2~~+tol~~-3thick/2);		translate([0,0,-thick/2]) cylinder(h=thick2,r=ppbd/2+rod/2-3thick/2); //center bore to reduce material amount and print time
	for(angle=[45:90:315]){		for(angle=[45:90:315]){
	rotate([0,0,angle]) translate([ppbd/2+rod/2+~~tol~~,0,-thick/2]) cylinder(d=rod,h=~~fph~~); //leg holes		rotate([0,0,angle]) translate([ppbd/2+rod/2+td,0,-thick/2]) cylinder(d=rod1.1,h=thick2); //leg holes for threaded rods
	}		}
	}		}
	translate([sbw/2,(ppbd+rod~~+tol~~-2thick)/(-2),0]) cube([thick,ppbd+rod~~+tol~~-2thick,thick]);		translate([sbw/2,(ppbd+rod-2thick)/(-2),0]) cube([thick,ppbd+rod-2thick,thick]); //support for switch mounting block
	translate([sbw/2,shp/2,thick]) difference(){ //switch mounting block, aligned with z-plane and x-plane, centered on y-plane		translate([sbw/2,shp/2,thick]) difference(){ //switch mounting block, aligned with z-plane and x-plane, centered on y-plane
	translate([0,-shp/2-nfw,0]) color("green") cube([thick,shp+2nfw,2nfw]);		translate([0,-shp/2-nfw,0]) color("green") cube([thick,shp+2nfw,2nfw]);
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	ror=nd/2; //rod outer radius		ror=nd/2; //rod outer radius
	pitch=25.4/tpi; //thread pitch in mm		pitch=25.4/tpi; //thread pitch in mm
	td=~~pitch*3~~/4; //thread depth in mm		td=13.74/tpi; //thread depth in mm
	rir=ror-td; //rod inner radius		rir=ror-td; //rod inner radius
	sor=ror+thick; //socket outer radius		sor=ror+thick; //socket outer radius
	vert= [for (ang=[0:360/$fn:720]) ang<=45 ? [cos(ang),sin(ang)]rir : ang<~~180~~ ? [cos(ang),sin(ang)](rir+td(ang-45)/~~135~~) : ang<=~~225~~ ? [cos(ang),sin(ang)]ror : ang<360 ?[cos(ang),sin(ang)](rir+td(360-ang)/~~135~~) : [cos(ang),sin(ang)]*sor];		vert= [for (ang=[0:360/$fn:720]) ang<=90 ? [cos(ang),sin(ang)]*rir :
	path1=[for(p=[0:$fn]) ~~mod(~~p,$fn) ];		ang<202.5 ? [cos(ang),sin(ang)](rir+td(ang-90)/112.5) :
	path2=[for(p=[0:$fn]) ~~mod(~~p,$fn)+$fn ];		ang<=247.5 ? [cos(ang),sin(ang)]*ror :
	difference(){		ang<360 ?[cos(ang),sin(ang)](rir+td(360-ang)/112.5) :
			[cos(ang),sin(ang)]*sor];
			path1=[for(p=[0:$fn]) p<$fn ? p : 0 ];
			path2=[for(p=[$fn:2$fn]) p<2$fn ? p : $fn ];
			color("green") difference(){
	linear_extrude(height=tl,center=false,convexivity=20,twist=tl/25.4tpi360){		linear_extrude(height=tl,center=false,convexivity=20,twist=tl/25.4tpi360){
	polygon(points=vert,paths=[path1,path2]);		polygon(points=vert,paths=[path1,path2]);
Line 90:		Line 94:
	}		}
	}		}


	//foot		//foot
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	for (angle=[45:90:315]){		for (angle=[45:90:315]){
	rotate([0,0,angle]){		rotate([0,0,angle]){
	translate([ppbd/2+rod/2+~~tol~~,0,thick]) socket(rod,tpi,fph,thick); //pillar		translate([ppbd/2+rod/2+13.74/tpi,0,thick]) socket(rod*1.1,tpi,fph,thick); //pillar
	translate([0,-thick,0]) cube([br-thick,thick*2,thick]); //leg		translate([0,-thick,0]) cube([br-thick,thick*2,thick]); //leg
	translate([br-thick,0,0]) cylinder(r=thick,h=thick); //foot		translate([br-thick,0,0]) cylinder(r=thick,h=thick); //foot
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	} //end for		} //end for
	} //end union		} //end union
	translate([0,0,-eps/2]) cylinder(d=ppbd~~+tol~~,h=fph+eps+thick); //ping pong ball entry		translate([0,0,-eps/2]) cylinder(d=ppbd,h=fph+eps+thick); //ping pong ball entry
	} //end difference		} //end difference
	} //end foot module		} //end foot module


			//head();
	foot();		foot();
	~~//head();~~
	</pre>		</pre>

	[[Category: CheapChineseLaser]]		[[Category: CheapChineseLaser]]

James: v3 updated foot section to increase tolerance and socket to add inlet chamfer

2017-05-08T03:35:28Z

v3 updated foot section to increase tolerance and socket to add inlet chamfer

← Older revision		Revision as of 03:35, 8 May 2017
Line 4:		Line 4:
	The base is internally threaded. The head needs nuts top and bottom. Washers would be good too.		The base is internally threaded. The head needs nuts top and bottom. Washers would be good too.

	[[File:Float-switch-head.stl]]		[[File:Float-switch-head.stl]] rendered on 5/1/2017

	[[File:Float-switch-base.stl]]		[[File:Float-switch-base.stl]] rendered on 5/7/2017

	~~stl files~~ rendered on 5/1/2017

	<pre>		<pre>
Line 29:		Line 27:
	nt=1; //nut thickness, switch mounting nuts		nt=1; //nut thickness, switch mounting nuts
	thick=5; //thickness		thick=5; //thickness
	~~fph=thick*3;//foot pillar height~~
	eps=0.1; //epsilon		eps=0.1; //epsilon
	tol=0.5; //tolerance		tol=0.5; //tolerance
Line 35:		Line 32:
	rod=25.4/4; //rod outer diameter		rod=25.4/4; //rod outer diameter
	tpi=20; //threads per inch		tpi=20; //threads per inch
			fph=25.4*5/tpi;//foot pillar height
	bfw=ppbd+2*thick; //base flange width		bfw=ppbd+2*thick; //base flange width
	$fn=40;		$fn=40;
Line 41:		Line 39:
	wr=4; //wrench size for nuts width across flats		wr=4; //wrench size for nuts width across flats
	nh=1; //nut height, depth of nut sockets		nh=1; //nut height, depth of nut sockets
	~~$fn=40;~~

	//head		//head
Line 75:		Line 72:

	module socket(nd,tpi,tl,thick) {		module socket(nd,tpi,tl,thick) {
			//nd = nominal diameter
			//tpi = threads per inch
			//tl = thread length
	ror=nd/2; //rod outer radius		ror=nd/2; //rod outer radius
	pitch=25.4/tpi; //thread pitch in mm		pitch=25.4/tpi; //thread pitch in mm
Line 81:		Line 81:
	sor=ror+thick; //socket outer radius		sor=ror+thick; //socket outer radius
	vert= [for (ang=[0:360/$fn:720]) ang<=45 ? [cos(ang),sin(ang)]rir : ang<180 ? [cos(ang),sin(ang)](rir+td(ang-45)/135) : ang<=225 ? [cos(ang),sin(ang)]ror : ang<360 ?[cos(ang),sin(ang)](rir+td(360-ang)/135) : [cos(ang),sin(ang)]*sor];		vert= [for (ang=[0:360/$fn:720]) ang<=45 ? [cos(ang),sin(ang)]rir : ang<180 ? [cos(ang),sin(ang)](rir+td(ang-45)/135) : ang<=225 ? [cos(ang),sin(ang)]ror : ang<360 ?[cos(ang),sin(ang)](rir+td(360-ang)/135) : [cos(ang),sin(ang)]*sor];
	path1=[for(p=[0:$fn]) mod(p,$fn) ];		path1=[for(p=[0:$fn]) mod(p,$fn) ];
	path2=[for(p=[0:$fn]) mod(p,$fn)+$fn ];		path2=[for(p=[0:$fn]) mod(p,$fn)+$fn ];
	linear_extrude(height=tl,center=false,convexivity=20,twist=tl/25.4tpi360){		difference(){
	polygon(points=vert,paths=[path1,path2]);		linear_extrude(height=tl,center=false,convexivity=20,twist=tl/25.4tpi360){
			polygon(points=vert,paths=[path1,path2]);
	}		}
			translate([0,0,tl-rortan(30)]) cylinder(r2=ror,r1=0,h=rortan(30)); //inlet chamfer
			}
	}		}


	//foot		//foot
Line 97:		Line 98:
	for (angle=[45:90:315]){		for (angle=[45:90:315]){
	rotate([0,0,angle]){		rotate([0,0,angle]){
	translate([ppbd/2+rod/2+tol,0,0]) socket(rod,tpi,fph,thick); //pillar		translate([ppbd/2+rod/2+tol,0,thick]) socket(rod,tpi,fph,thick); //pillar
	translate([0,-thick,0]) cube([br-thick,thick*2,thick]); //leg		translate([0,-thick,0]) cube([br-thick,thick*2,thick]); //leg
	translate([br-thick,0,0]) cylinder(r=thick,h=thick); //foot		translate([br-thick,0,0]) cylinder(r=thick,h=thick); //foot
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	} //end for		} //end for
	} //end union		} //end union
	translate([0,0,-eps/2]) cylinder(d=ppbd+tol,h=fph+eps); //ping pong ball entry		translate([0,0,-eps/2]) cylinder(d=ppbd+tol,h=fph+eps+thick); //ping pong ball entry
	} //end difference		} //end difference
	} //end foot module		} //end foot module

	head();		foot();
			//head();
	</pre>		</pre>

	[[Category: CheapChineseLaser]]		[[Category: CheapChineseLaser]]

James: added links to stl files.

2017-05-01T22:49:58Z

added links to stl files.

← Older revision		Revision as of 22:49, 1 May 2017
Line 3:		Line 3:
	You also need 4 pieces of 1/4-20 all thread to connect the two of them and 8 nuts.		You also need 4 pieces of 1/4-20 all thread to connect the two of them and 8 nuts.
	The base is internally threaded. The head needs nuts top and bottom. Washers would be good too.		The base is internally threaded. The head needs nuts top and bottom. Washers would be good too.

			[[File:Float-switch-head.stl]]

			[[File:Float-switch-base.stl]]

			stl files rendered on 5/1/2017

	<pre>		<pre>
	/*		/*

James: created page

2017-05-01T22:47:16Z

created page

New page

This is the source code for the float switch 3d printed parts for the water level detector for the [[Cheap Chinese Laser]].
It is made in two parts: the head and the base.
You also need 4 pieces of 1/4-20 all thread to connect the two of them and 8 nuts.
The base is internally threaded. The head needs nuts top and bottom. Washers would be good too.
<pre>
/*
low water level detector
safety interlock for cheap Chinese laser at Hac DC
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.
James Sullivan
4-30-17
Mk 2 - calculated threads
OpenSCAD version 2015.03-1
*/
ppbd=40; //ping pong ball diameter
ppbw=2.7; //ping pong ball weight in grams
shd=2; //switch hole diameter
shp=10; //switch hole pitch, i.e. center to center spacing of mounting holes on microswitch
wlh=200; //water level height
sbw=6; //switch body width
nfw=4; //nut face width, switch mounting nuts
nt=1; //nut thickness, switch mounting nuts
thick=5; //thickness
fph=thick*3;//foot pillar height
eps=0.1; //epsilon
tol=0.5; //tolerance
br=50; //base radius
rod=25.4/4; //rod outer diameter
tpi=20; //threads per inch
bfw=ppbd+2*thick; //base flange width
$fn=40;
function mod(num,den) = num - floor(num/den)*den;
//dimensions taken from Front Door Switch Holder
wr=4; //wrench size for nuts width across flats
nh=1; //nut height, depth of nut sockets
$fn=40;

//head
module head() {
difference(){
union(){
for(angle=[45:90:315]){
rotate([0,0,angle]) translate([ppbd/2+rod/2+tol,0,0]) cylinder(d=rod+thick*2,h=thick); //leg cylinders
}
cylinder(h=thick,r=ppbd/2+rod/2+tol-thick/2);
}
translate([0,0,-thick/2]) cylinder(h=thick*2,r=ppbd/2+rod/2+tol-3*thick/2);
for(angle=[45:90:315]){
rotate([0,0,angle]) translate([ppbd/2+rod/2+tol,0,-thick/2]) cylinder(d=rod,h=fph); //leg holes
}
}
translate([sbw/2,(ppbd+rod+tol-2*thick)/(-2),0]) cube([thick,ppbd+rod+tol-2*thick,thick]);
translate([sbw/2,shp/2,thick]) difference(){ //switch mounting block, aligned with z-plane and x-plane, centered on y-plane
translate([0,-shp/2-nfw,0]) color("green") cube([thick,shp+2*nfw,2*nfw]);
for (y=[-shp/2,shp/2]) {
translate([thick/2,y,nfw]) rotate([0,90,0]) cylinder(d=shd,h=thick*2,center=true); //screw holes
translate([sbw-nh,y,nfw]) union(){ //nut sockets
for (ang=[0,120,240]) rotate([ang,0,0]) cube([nh*2,wr,wr/sqrt(3)],center=true);
}
}
translate([sbw/2+thick,bfw/2-nfw-shp,nfw]) union(){ //center nut socket
cube([nh*2,wr,wr/sqrt(3)],center=true);
rotate([120,0,0]) cube([nh*2,wr,wr/sqrt(3)],center=true);
rotate([240,0,0]) cube([nh*2,wr,wr/sqrt(3)],center=true);
}
}
}

module socket(nd,tpi,tl,thick) {
ror=nd/2; //rod outer radius
pitch=25.4/tpi; //thread pitch in mm
td=pitch*3/4; //thread depth in mm
rir=ror-td; //rod inner radius
sor=ror+thick; //socket outer radius
vert= [for (ang=[0:360/$fn:720]) ang<=45 ? [cos(ang),sin(ang)]*rir : ang<180 ? [cos(ang),sin(ang)]*(rir+td*(ang-45)/135) : ang<=225 ? [cos(ang),sin(ang)]*ror : ang<360 ?[cos(ang),sin(ang)]*(rir+td*(360-ang)/135) : [cos(ang),sin(ang)]*sor];
path1=[for(p=[0:$fn]) mod(p,$fn) ];
path2=[for(p=[0:$fn]) mod(p,$fn)+$fn ];
linear_extrude(height=tl,center=false,convexivity=20,twist=tl/25.4*tpi*360){
polygon(points=vert,paths=[path1,path2]);

}
}

//foot
module foot(){
difference(){
union(){
translate([0,0,thick/2]) cube([ppbd+2*thick,ppbd+2*thick,thick],center=true);
for (angle=[45:90:315]){
rotate([0,0,angle]){
translate([ppbd/2+rod/2+tol,0,0]) socket(rod,tpi,fph,thick); //pillar
translate([0,-thick,0]) cube([br-thick,thick*2,thick]); //leg
translate([br-thick,0,0]) cylinder(r=thick,h=thick); //foot
} //end rotate
} //end for
} //end union
translate([0,0,-eps/2]) cylinder(d=ppbd+tol,h=fph+eps); //ping pong ball entry
} //end difference
} //end foot module

head();
</pre>

[[Category: CheapChineseLaser]]