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OpenSCAD source code: Mount for circular bulkhead connector
// Circular connector bracket
// Ed Nisley KE4ZNU 2018-02-22
//-- Extrusion parameters
ThreadThick = 0.25;
ThreadWidth = 0.4;
HoleWindage = 0.3; // enlarge hole dia by this amount
function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit);
Protrusion = 0.1; // make holes look good and joints intersect properly
//-- Useful sizes
inch = 25.4;
Tap10_32 = 0.159 * inch;
Clear10_32 = 0.190 * inch;
Head10_32 = 0.373 * inch;
Head10_32Thick = 0.110 * inch;
Nut10_32Dia = 0.433 * inch;
Nut10_32Thick = 0.130 * inch;
ID = 0;
OD = 1;
LENGTH = 2;
//-- Mount Sizes
Connector = [14.6,15.5,4.0]; // connector thread; ID = dia at flat
Screw = [5.1,10.0,3.0]; // screw size, more-or-less 10-32, OD & LENGTH for head
MountWidth = IntegerMultiple(2*Connector[OD],ThreadWidth); // use BCD for motor clearance
MountThick = IntegerMultiple(Connector[LENGTH],ThreadThick); // for stiffness
WallThick = 3.0; // default wall thickness
StandThick = IntegerMultiple(WallThick,ThreadWidth); // baseplate
StrutThick = IntegerMultiple(WallThick,ThreadWidth); // sides holding motor mount
UprightLength = MountWidth + 2*StrutThick;
StandBoltHead = IntegerMultiple(Head10_32,5); // bolt head rounded up
StandBoltOC = IntegerMultiple(UprightLength + 2*StandBoltHead,5);
StandLength = StandBoltOC + 2*StandBoltHead;
StandWidth = 2*StandBoltHead;
StandBoltClear = (StandLength - UprightLength)/2; // flat around bolt head
Recess = StandWidth - MountThick;
echo(str("Stand Base: ",StandLength," x ",StandWidth," x ",StandThick));
echo(str("Stand Bolt OC: ",StandBoltOC));
echo(str("Strut Thick: ",StrutThick));
//----------------------
// 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);
}
//----------------------
// Model
module MotorMount() {
difference() {
translate([StandThick/2,0,StandWidth/2])
cube([(MountWidth + StandThick),StandLength,StandWidth],center=true);
translate([-Protrusion/2,0,StandWidth - (Recess - Protrusion)/2])
cube([(MountWidth + Protrusion),MountWidth,(Recess + Protrusion)],center=true);
translate([0,0,-Protrusion])
PolyCyl(Connector[OD],StandWidth,4*4);
for (j=[-1,1]) // cutouts over bolts
translate([-Protrusion/2,
j*((StandLength - StandBoltClear)/2 + Protrusion/2),
StandWidth/2])
cube([(MountWidth + Protrusion),
(StandBoltClear + Protrusion),
(StandWidth + 2*Protrusion)],center=true);
for (j=[-1,1]) // stand bolt holes
translate([(MountWidth/2 - Protrusion),j*StandBoltOC/2,StandWidth/2])
rotate([0,90,0])
rotate(180/6)
PolyCyl(Clear10_32,StandThick + 2*Protrusion,6);
translate([0,-(UprightLength/2 - ThreadWidth/2),StandWidth/2])
rotate([90,180,0])
linear_extrude(ThreadWidth,convexity=10)
text(text=str(Connector[OD]),size=6,spacing=1.20,font="Arial",halign="center",valign="center");
}
}
//----------------------
// Build it
MotorMount();
@ednisley

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ednisley commented Feb 24, 2018

More details on my blog at https://wp.me/poZKh-7nH

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