OpenSCAD source code: NEMA17 stepper mount with matching bearing mount

Bearing Mount.scad

// Ball bearing mount
// Ed Nisley KE4ZNU 2017-10-09

//-- Extrusion parameters

ThreadThick = 0.20;
ThreadWidth = 0.40;

HoleWindage = 0.2;			// 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;

// Bearing sizes

ID = 0;
OD = 1;
LENGTH = 2;

Bearing = [8.0,22.0,7.0];

ShaftHeight = IntegerMultiple(25.2,ThreadWidth);           // arbitrary or copied from motor mount

WallThick = 3.0;

//-- Mount Sizes

MountSize = Bearing[OD] + 2*WallThick;

BaseThick = max(WallThick,ShaftHeight - MountSize/2);				// baseplate

StandBoltHead = IntegerMultiple(Head10_32,2);				// bolt head rounded up
StandBoltClear = 1.25 * StandBoltHead;

StandBoltOC = IntegerMultiple(MountSize + StandBoltClear,2);

StandLength = StandBoltOC + StandBoltClear;
StandThick = StandBoltClear + WallThick;
StandHeight = MountSize + BaseThick;

Cutout = (StandLength - MountSize)/2;

echo(str("Stand Base: ",StandLength," x ",StandThick," x ",BaseThick));
echo(str("Stand Bolt OC: ",StandBoltOC));
echo(str("Shaft Height:",ShaftHeight));

//----------------------
// 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);
}

//----------------------
// Put it together

module BearingMount() {

  difference() {
    translate([BaseThick/2,0,StandThick/2])
      cube([StandHeight,StandLength,StandThick],center=true);
    translate([0,0,-Protrusion])
      PolyCyl(Bearing[OD],(StandThick + 2*Protrusion));
    for (j=[-1,1])								// cutouts over bolts
      translate([-(StandHeight/2 - ShaftHeight + WallThick),
          j*(StandLength/2 - Cutout/2 + Protrusion/2),
          (WallThick + StandThick/2)])
      cube([StandHeight,
        Cutout + Protrusion,
        StandThick],center=true);
    for (j=[-1,1])								// stand bolt holes - base
      translate([(MountSize/2 - Protrusion),
                j*StandBoltOC/2,
                WallThick + StandBoltClear/2])
      rotate([0,90,0])
        rotate(180/6)
          PolyCyl(Clear10_32,BaseThick + 2*Protrusion,6);
    for (j=[-1,1])								// stand bolt holes - back
      translate([0,j*StandBoltOC/2,-Protrusion])
        rotate(180/6)
          PolyCyl(Clear10_32,StandThick + 2*Protrusion,6);
   translate([0,-(MountSize/2 - ThreadWidth/2),(StandThick - WallThick)/2 + WallThick])
      rotate([90,180,0])
        linear_extrude(ThreadWidth,convexity=10)
          text(text=str(ShaftHeight),size=6,spacing=1.20,font="Arial",halign="center",valign="center");

  }

}

//----------------------
// Build it

	BearingMount();

NEMA17 Mount.scad

// NEMA 17 stepper mount
// Ed Nisley KE4ZNU August 2011
// Tweaked & thinned 2017-10-09

//-- 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;



NEMA17_ShaftDia = 5.0;
NEMA17_ShaftLength = 24.0;
NEMA17_PilotDia = 0.866 * inch;
NEMA17_PilotLength = 0.080 * inch;
NEMA17_BCD = 1.725 * inch;
NEMA17_BoltDia = 3.5;
NEMA17_BoltOC = 1.220 * inch;

//-- Mount Sizes

MountWidth = IntegerMultiple(NEMA17_BCD,ThreadWidth);    // use BCD for motor clearance
MountThick = IntegerMultiple(4.0,ThreadThick);        // for stiffness

MountBoltDia = 3.0;

StandThick = 3.0;        // baseplate

StrutThick = IntegerMultiple(3.0,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

MotorRecess = StandWidth - MountThick;

ShaftHeight = IntegerMultiple(StandThick + MountWidth/2,ThreadWidth);

echo(str("Stand Base: ",StandLength," x ",StandWidth," x ",StandThick));
echo(str("Stand Bolt OC: ",StandBoltOC));
echo(str("Shaft Height:",ShaftHeight));
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 - (MotorRecess - Protrusion)/2])
    cube([(MountWidth + Protrusion),MountWidth,(MotorRecess + Protrusion)],center=true);
  translate([0,0,-Protrusion])        // pilot hole
    PolyCyl(NEMA17_PilotDia,(MountThick + 2*Protrusion));
  for (i=[-1,1])                // motor bolt holes
    for (j=[-1,1])
    translate([i*NEMA17_BoltOC/2,j*NEMA17_BoltOC/2,-Protrusion])
      PolyCyl(MountBoltDia,(MountThick + 2*Protrusion),6);
  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(ShaftHeight),size=6,spacing=1.20,font="Arial",halign="center",valign="center");

  }

}

//----------------------
// Build it

  MotorMount();

More details on my blog at http://wp.me/poZKh-76D