OpenSCAD source code: Fire Hydrant Wrench -- just for fun

Hydrant Wrench.scad

// Hydrant Wrench
// Ed Nisley KE4ZNU - September 2017

/* [Extrusion] */

ThreadThick = 0.25;       // [0.20, 0.25]
ThreadWidth = 0.40;       // [0.40]

function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit);

Protrusion = 0.01;        // [0.01, 0.1]

HoleWindage = 0.2;

//- Sizes
/* [Dimensions] */

NumFlats = 5;         // this is not a variable for this geometry!

Height = 39.0;        // pentagon flat-to-vertex measurement
Side = Height / 1.539;
echo(str("Side:",Side));

Radius = Side / 1.176;
echo(str("Radius: ",Radius));

WrenchDia = 2*Radius;    // pentagon circumcircle diameter
echo(str("Wrench dia:",WrenchDia));

JawWidth = 10.0;

JawOD = 2*JawWidth + WrenchDia;
echo(str("Jaw OD: ",JawOD));

WrenchThick = 5.0;

HandleLength = 2*JawOD;
HandleWidth = 25.0;

//- Build things

difference() {
  linear_extrude(height=WrenchThick,convexity=4) {
    hull() {                      // taper wrench body to handle
      circle(d=JawOD);
      translate([0.75*JawOD,0,0])
        circle(d=HandleWidth);
    }
    hull() {                      // handle
      translate([0.75*JawOD,0,0])
        circle(d=HandleWidth);
      translate([HandleLength,0,0])
        circle(d=HandleWidth);
    }
  }
  translate([0,0,-Protrusion])
    rotate(180/NumFlats)
      cylinder(d=WrenchDia,h=(WrenchThick + 2*Protrusion),$fn=NumFlats);

  translate([WrenchDia,0,WrenchThick - 3*ThreadThick])
    linear_extrude(3*ThreadThick + Protrusion,convexity=10)
      text(text=str("Fire Hydrant!"),size=8,spacing=1.20,font="Arial",halign="left",valign="center");
}

More details on my blog at http://wp.me/poZKh-74H