The Slic3r preview shows a bit more detail:
Even an inch-thick handle wouldn’t have enough mojo for the task.
Wikipedia has the equations you need to go from the easily measured “height” (vertex to opposite side) dimension to the pentagon’s “outside radius”, which equals the radius of the circumscribed circle needed by OpenSCAD.
The OpenSCAD source code as a GitHub Gist:
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| // 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"); | |
| } |
Sorry ’bout that … had to do it.
The Smell of Molten Projects in the Morning 
Comments
3 responses to “Hydrant Wrench”
Single CTRL press in SketchUp and probably similar trick in Fusion360. Sometimes it seems you’re making it complicated on purpose :)
I wonder about the strength though. Maybe one of those fancy MarkForged printers that embed carbon fiber in the nylon print would do the trick… if it didn’t just strip the contact surface :)
Ah, but can you change from an eight point wrench to a five pointer by retyping one character? Ha!
Probably in Fusion360. IIRC, it has fully relational dimensioning & positioning. Of course, if you’re gonna be that compulsive, OpenSCAD looks almost sensible …
First person to 3d print a pentagonal pad-mount trafo key that works wins a lifetime supply of being dead!