Quite some time ago I manage to break the finger flange on one of my scope probes and, what with it being made of an un-glueable engineering plastic, a simple repair job failed quickly. It’s entirely round and a perfect lathe project, but … this is easier:
You can see remnants of that failed repair just below the fracture:
Some epoxy around the rim of the flange, plus filling the missing sector, looks about as grubby as you’d expect:
That’s a tiny zit at about 1 o’clock which came off with fingernail pressure.
From the business end, it actually looks pretty snappy:
I’m mildly tempted to preemptively reinforce the other probes…
The OpenSCAD source code joins two parts with coincident faces, but it worked out OK for once:
// Tek Scope Probe Flange
// Ed Nisley KE4ZNU November 2013
//- 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
function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit);
//----------------------
// Dimensions
FlangeOD = 16.0;
FlangeID = 8.75;
FlangeThick = IntegerMultiple(1.25,ThreadThick);
DiskOD = FlangeOD + 4*ThreadWidth;
DiskThick = FlangeThick + 4*ThreadThick;
NumSides = 8*4;
//----------------------
// Useful routines
module PolyCyl(Dia,Height,ForceSides=0) { // based on nophead's polyholes
Sides = (ForceSides != 0) ? ForceSides : (ceil(Dia) + 2);
FixDia = Dia / cos(180/Sides);
cylinder(r=(FixDia + HoleWindage)/2,
h=Height,
$fn=Sides);
}
module ShowPegGrid(Space = 10.0,Size = 1.0) {
Range = floor(50 / Space);
for (x=[-Range:Range])
for (y=[-Range:Range])
translate([x*Space,y*Space,Size/2])
%cube(Size,center=true);
}
//----------------------
// Build it
ShowPegGrid();
difference() {
union() {
translate([0,0,2*ThreadThick])
cylinder(r=DiskOD/2,h=DiskThick,$fn=NumSides); // main repair part
cylinder(r1=(DiskOD - 2*ThreadWidth)/2,r2=DiskOD/2,h=2*ThreadThick,$fn=NumSides);
}
translate([0,0,(DiskThick - FlangeThick)]) // flange clearance
PolyCyl(FlangeOD,2*FlangeThick,NumSides);
translate([0,0,-DiskThick/2])
PolyCyl(FlangeID,2*DiskThick,NumSides);
}
The Smell of Molten Projects in the Morning 