The New Hotness

A small ShopVac arrived with a ribbed hose carrying an absurdly long wand, so I conjured a barbed adapter with a much shorter tapered snout for the machine tools:

Vacuum hose fittings - hose barb to nozzle — Vacuum hose fittings – hose barb to nozzle

Trimming the hose end at one of the ribs makes a tidy fit:

Vacuum hose fittings - ribbed hose barb — Vacuum hose fittings – ribbed hose barb

Now I need not trip over the vacuum hose between the bandsaw bench and the sander bench…

The OpenSCAD code as a GitHub Gist:

	// Vacuum Hose Fittings
	// Ed Nisley KE4ZNU July 2016
	// March 2017

	Layout = "HoseBarb"; // PVCtoHose ExpandRing PipeToPort FVacPipe FVacFitting HoseBarb

	//– Extrusion parameters must match reality!
	// Print with 2 shells and 3 solid layers

	ThreadThick = 0.25;
	ThreadWidth = 0.40;

	HoleWindage = 0.2;

	Protrusion = 0.1; // make holes end cleanly

	//———————-
	// Dimensions

	ID = 0;
	OD = 1;
	LENGTH = 2;

	VacNozzle = [30.1,31.8,30.0]; // nozzle on vacuum hose (taper ID to OD over length)

	MINOR = 0;
	MAJOR = 1;
	PITCH = 2;
	FORM_OD = 3;

	HoseThread = [32.0,(37.0 + HoleWindage),4.25,(1.8 + 0.20)]; // vacuum hose thread

	NumSegments = 64; // .. number of cylinder approximations per turn
	$fn = NumSegments;

	ThreadLength = 4 * HoseThread[PITCH];
	ScrewOAL = ThreadLength + HoseThread[PITCH];

	WallThick = 2.5;

	echo(str("Pitch dia: ",HoseThread[MAJOR]));
	echo(str("Root dia: ",HoseThread[MAJOR] – HoseThread[FORM_OD]));
	echo(str("Crest dia: ",HoseThread[MAJOR] + HoseThread[FORM_OD]));


	//———————-
	// Wrap cylindrical thread segments around larger plug cylinder

	module CylinderThread(Pitch,Length,PitchDia,ThreadOD,PerTurn,Chirality = "Left") {

	CylFudge = 1.02; // force overlap
	ThreadSides = 6;

	RotIncr = 1/PerTurn;
	PitchRad = PitchDia/2;

	Turns = Length/Pitch;
	NumCyls = Turns*PerTurn;

	ZStep = Pitch / PerTurn;

	HelixAngle = ((Chirality == "Left") ? –1 : 1) * atan(Pitch/(PI*PitchDia));
	CylLength = CylFudge * (PI*(PitchDia + ThreadOD) / PerTurn) / cos(HelixAngle);

	for (i = [0:NumCyls–1]) {
	Angle = ((Chirality == "Left") ? –1 : 1) * 360*i/PerTurn;
	translate([PitchRadcos(Angle),PitchRadsin(Angle),i*ZStep])
	rotate([90+HelixAngle,0,Angle]) rotate(180/ThreadSides)
	cylinder(r1=ThreadOD/2,
	r2=ThreadOD/(2*CylFudge),
	h=CylLength,
	center=true,$fn=ThreadSides);
	}
	}

	//— PVC fitting to vacuum hose

	module PVCtoHose() {

	Fitting = [34.0,41.0,16.0]; // 1 inch PVC elbow
	Adapter = [HoseThread[MAJOR],(Fitting[OD] + 2*WallThick + HoleWindage),(ScrewOAL + Fitting[LENGTH])]; // dimensions for entire fitting

	union() {
	difference() {
	cylinder(d=Adapter[OD],h=Adapter[LENGTH]); // overall fitting
	translate([0,0,–Protrusion]) // remove thread pitch dia
	cylinder(d=HoseThread[MAJOR],h=(ScrewOAL + 2*Protrusion));
	translate([0,0,(ScrewOAL – Protrusion)]) // remove PVC fitting dia
	cylinder(d=(Fitting[OD] + HoleWindage),h=(Fitting[LENGTH] + 2*Protrusion));
	}

	translate([0,0,HoseThread[PITCH]/2]) // add the thread form
	CylinderThread(HoseThread[PITCH],ThreadLength,HoseThread[MAJOR],HoseThread[FORM_OD],NumSegments,"Left");
	}
	}

	//— Expander ring from small OD to large ID PVC fittings
	// So a small elbow on the bandsaw fits into the hose adapter, which may not be long-term useful

	module ExpandRing() {

	Fitting_L = [34.0,41.0,16.0]; // 1 inch PVC pipe elbow
	Fitting_S = [26.8,32.8,17]; // 3/4 inch PVC elbow

	difference() {
	cylinder(d1=Fitting_L[OD],d2=(Fitting_L[OD] – HoleWindage),h=Fitting_L[LENGTH]); // overall fitting
	translate([0,0,–Protrusion])
	cylinder(d=(Fitting_S[OD] + HoleWindage),h=(Fitting_L[LENGTH] + 2*Protrusion));
	}
	}

	//— 1 inch PVC pipe into vacuum port
	// Stick this in the port, then plug a fitting onto the pipe section

	module PipeToPort() {

	Pipe = [26.5,33.5,20.0]; // 1 inch Schedule 40 PVC pipe

	difference() {
	union() {
	cylinder(d=Pipe[OD],h=(Pipe[LENGTH] + Protrusion));
	translate([0,0,(Pipe[LENGTH] – Protrusion)])
	cylinder(d1=VacNozzle[OD],d2=VacNozzle[ID],h=VacNozzle[LENGTH]);
	}
	translate([0,0,–Protrusion])
	cylinder(d=Pipe[ID],h=(Pipe[LENGTH] + VacNozzle[LENGTH] + 2*Protrusion));
	}
	}

	//— Female Vac outlet inside PVC pipe
	// Plug this into PVC fitting, then plug hose + nozzle into outlet

	module FVacPipe() {

	VacPort = [30.0,31.3,25]; // vacuum port on belt sander (taper ID to OD over length)
	Pipe = [26.5,33.5,20.0]; // 1 inch Schedule 40 PVC pipe

	difference() {
	cylinder(d=Pipe[OD],h=VacPort[LENGTH]);
	translate([0,0,–Protrusion])
	cylinder(d1=VacPort[ID],d2=VacPort[OD],h=(VacPort[LENGTH] + 2*Protrusion));
	}
	}


	//— Female Vac outlet on 3/4 inch fitting OD
	// Jam this onto OD of fitting, plug hose + nozzle into outlet

	module FVacFitting() {

	Adapter = [26.5,(33.5 + 2*WallThick),17.0]; // overall adapter
	//VacPort = [30.0,31.3,25]; // vacuum port on belt sander (taper ID to OD over length)
	VacPort = [30.1,31.8,30.0]; // vacuum port for bandsaw = inverse of hose nozzle
	Fitting = [26.8,32.8,17]; // 3/4 inch PVC elbow

	TaperLength = 5.0; // inner taper to avoid overhang

	difference() {
	cylinder(d=Adapter[OD],h=Adapter[LENGTH]); // overall fitting
	translate([0,0,–Protrusion])
	cylinder(d=(Fitting[OD] + HoleWindage),h=(Adapter[LENGTH] + 2*Protrusion));
	}

	translate([0,0,Adapter[LENGTH]])
	difference() {
	cylinder(d=Adapter[OD],h=TaperLength);
	translate([0,0,–Protrusion])
	cylinder(d1=(Fitting[OD] + HoleWindage),d2=VacPort[ID],h=(TaperLength + 2*Protrusion));
	}

	translate([0,0,(TaperLength + Adapter[LENGTH])]) // vac fitting
	difference() {
	cylinder(d=Adapter[OD],h=VacPort[LENGTH]);
	translate([0,0,–Protrusion])
	cylinder(d1=VacPort[ID],d2=VacPort[OD],h=(VacPort[LENGTH] + 2*Protrusion));
	}
	}

	//— Hose barb to male vacuum taper

	module HoseBarb() {

	HoseFitting = [29.0,32.2,38.5];

	Barb = [HoseFitting[OD],35.5,4.0];
	BarbOffset = 17.0;

	Seat = [HoseFitting[OD],36.0,5.0];
	SeatSupport = [HoseFitting[OD],Seat[OD],(Seat[OD] – HoseFitting[OD])/2];

	OAL = HoseFitting[LENGTH] + SeatSupport[LENGTH] + Seat[LENGTH] + VacNozzle[LENGTH];

	NumSides = 4*8;

	difference() {
	union() {
	cylinder(d=HoseFitting[OD],h=HoseFitting[LENGTH],$fn=NumSides);
	translate([0,0,BarbOffset])
	cylinder(d1=Barb[ID],d2=Barb[OD],h=Barb[LENGTH],$fn=NumSides);
	translate([0,0,HoseFitting[LENGTH]])
	cylinder(d1=SeatSupport[ID],d2=SeatSupport[OD],h=SeatSupport[LENGTH],$fn=NumSides);
	translate([0,0,HoseFitting[LENGTH] + SeatSupport[LENGTH]])
	cylinder(d=Seat[OD],h=Seat[LENGTH],$fn=NumSides);
	translate([0,0,HoseFitting[LENGTH] + SeatSupport[LENGTH] + Seat[LENGTH]])
	cylinder(d1=VacNozzle[OD],d2=VacNozzle[ID],h=VacNozzle[LENGTH],$fn=NumSides);
	}
	translate([0,0,–Protrusion])
	cylinder(d1=HoseFitting[ID],d2=(VacNozzle[ID] – 10ThreadWidth),h=OAL + 2Protrusion,$fn=NumSides);
	}

	}


	//———-
	// Build things

	if (Layout == "PVCtoHose")
	PVCtoHose();

	if (Layout == "ExpandRing") {
	ExpandRing();
	}

	if (Layout == "PipeToPort") {
	PipeToPort();
	}

	if (Layout == "FVacPipe") {
	FVacPipe();
	}

	if (Layout == "FVacFitting") {
	FVacFitting();
	}

	if (Layout == "HoseBarb") {
	HoseBarb();
	}

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The New Hotness

ShopVac Hose Barb Adapter