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OpenSCAD source code: replacement clips for fake muntin grille
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// Window Muntin Clips | |
// Ed Nisley KE4ZNU June 2022 | |
Layout = "Show"; // [Build, Show] | |
/* [Hidden] */ | |
ThreadThick = 0.25; | |
ThreadWidth = 0.40; | |
HoleWindage = 0.2; | |
Protrusion = 0.1; // make holes end cleanly | |
inch = 25.4; | |
ID = 0; | |
OD = 1; | |
LENGTH = 2; | |
function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit); | |
//---------------------- | |
// Dimensions | |
ClipOA = [13.0,18.7,8.0]; | |
TongueAngle = 70; | |
TongueOA = [14.0,10.0,1.8 - 0.2]; // minus Z windage for angular slices | |
BuildGap = 5.0; | |
//---------------------- | |
// 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, | |
$fn=Sides); | |
} | |
//---------------------- | |
// Pieces | |
module Shell() { | |
// Clip base as 2D polygon | |
// Magic numbers from measurements | |
cx = ClipOA.x; | |
cy = ClipOA.y; | |
cz = ClipOA.z; | |
ClipPts = [ | |
[0,0],[0,cz],[0.3,cz], | |
[1.0,cz-1.0],[2.0,cz-2.3],[2.0,cz-3.0],[1.3,cz-3.5], | |
[1.3,1.6],[17.4,1.6], | |
[17.4,cz-3.5],[16.7,cz-3.0],[16.7,cz-2.3],[17.7,cz-1.0], | |
[18.4,cz],[18.7,cz],[18.7,0.0],[0,0] | |
]; | |
difference() { | |
translate([-ClipOA.x,-ClipOA.y/2,0]) | |
rotate([90,0,90]) | |
linear_extrude(height=ClipOA.x,convexity=3) | |
polygon(convexity=3,points=ClipPts); | |
translate([-(ClipOA.x - 3.0/2 + Protrusion),0,0]) | |
cube([3.0 + Protrusion,ClipOA.y - 2*1.3,4*1.6],center=true); | |
} | |
} | |
module Tongue() { | |
tx = TongueOA.x; | |
ty = TongueOA.y; | |
tz = TongueOA.z; | |
tt = ty - 2*sqrt(2)*tz; // width at top of tapers | |
td = ThreadWidth; // min size of features | |
intersection() { | |
rotate([0,-TongueAngle,0]) { | |
difference() { | |
union() { | |
hull() { | |
for (j=[-1,1]) { | |
translate([td/2,j*(ty - td)/2,td/2]) | |
cube(td,center=true); | |
translate([td/2,j*(tt - td)/2,tz - td/2]) | |
cube(td,center=true); | |
} | |
translate([10.0,0,0]) | |
rotate(180/12) | |
cylinder(d=ty,h=td,center=false,$fn=12); | |
translate([10.0,0,tz - td/2]) | |
rotate(180/12) | |
cylinder(d=tt,h=td,center=false,$fn=12); | |
}; | |
translate([10.0,0,-5.2]) | |
rotate(180/12) | |
cylinder(d=5.0,h=5.2,center=false,$fn=12); | |
translate([10.0,0,-5.2]) | |
rotate(180/12) | |
resize([0,0,2.0]) | |
sphere(d=5.0/cos(180/12),$fn=12); | |
} | |
if (false) | |
translate([10.0,0,-10]) // stiffening hole | |
rotate(180/6) | |
PolyCyl(0.1,20,6); | |
} | |
} | |
cube([2*ClipOA.x,2*ClipOA.y,2*IntegerMultiple(13.0,ThreadThick)],center=true); | |
} | |
} | |
module Clip() { | |
Shell(); | |
Tongue(); | |
} | |
//---------------------- | |
// Build it | |
if (Layout == "Show") { | |
Clip(); | |
} | |
if (Layout == "Build") { | |
Clip(); | |
} |
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