OpenSCAD source code: Mount for circular bulkhead connector

Connector Mount.scad

// 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();

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