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StepMotor_28BYJ-48.scad
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StepMotor_28BYJ-48.scad
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// 28BYJ-48 from RGriffoGoes
// at http://www.thingiverse.com/thing:204734
// named and measured dimensions, and
// added details by J.Beale 21 July 2014
MBH = 18.8; // motor body height
MBD = 28.25; // motor body OD
SBD = 9.1; // shaft boss OD
SBH = 1.45; // shaft boss height above motor body
SBO = 7.875; // offset of shaft/boss center from motor center
SHD = 4.93; // motor shaft OD
SHDF = 3.0; // motor shaft diameter, across flats
SHHF = 6.0; // motor shaft flats height, or depth in from end
SHH = 9.75; // height of shaft above motor body
MBFH = 0.7; // height of body edge flange protruding above surface
MBFW = 1.0; // width of edge flange
MBFNW = 8; // width of notch in edge flange
MBFNW2 = 17.8; // width of edge flange notch above wiring box
MHCC = 35.0; // mounting hole center-to-center
MTH = 0.8; // mounting tab thickness
MTW = 7.0; // mounting tab width
WBH = 16.7; // plastic wiring box height
WBW = 14.6; // plastic wiring box width
WBD = 31.3; // body diameter to outer surface of wiring box
WRD = 1.0; // diameter of electrical wires
WRL = 30; // length of electrical wires
WRO = 2.2; // offset of wires below top motor surface
// =========================================================
eps = 0.05; // small number to avoid coincident faces
module wires() {
color([0.9,0.9,0]) translate([0,WRD*2,0]) cylinder(h=WRL,r=WRD/2, $fn = 7);
color([.9,.45,0]) translate([0,WRD*1,0]) cylinder(h=WRL,r=WRD/2, $fn = 7);
color([1,0,0]) translate([0,0,0]) cylinder(h=WRL,r=WRD/2, $fn = 7);
color([1,.6,.6]) translate([0,-WRD*1,0]) cylinder(h=WRL,r=WRD/2, $fn = 7);
color([.2,.2,1]) translate([0,-WRD*2,0]) cylinder(h=WRL,r=WRD/2, $fn = 7);
}
module StepMotor28BYJ()
{
difference(){
union(){
color("gray") translate([0,0,-(MBH+MBFH)/2])
difference() { // flange at top rim
cylinder(h = MBFH+eps, r = MBD/2, center = true, $fn = 50);
cylinder(h = MBFH+2*eps, r = (MBD-MBFW)/2, center = true, $fn = 32);
cube([MBFNW,MHCC,MBFH*2],center=true); // notches in rim
cube([MBD+2*MBFW,SBD,MBFH*2],center=true);
translate([-MBD/2,0,0]) cube([MBD,MBFNW2,MBFH*2],center=true);
}
color("gray") // motor body
cylinder(h = MBH, r = MBD/2, center = true, $fn = 50);
color("gray") translate([SBO,0,-SBH]) // shaft boss
cylinder(h = MBH, r = SBD/2, center = true, $fn = 32);
translate([SBO,0,-SHH]) // motor shaft
difference() {
color("gold") cylinder(h = MBH, r = SHD/2, center = true, $fn = 32);
// shaft flats
color("red") translate([(SHD+SHDF)/2,0,-(eps+MBH-SHHF)/2])
cube([SHD,SHD,SHHF], center = true);
color("red") translate([-(SHD+SHDF)/2,0,-(eps+MBH-SHHF)/2])
cube([SHD,SHD,SHHF], center = true);
}
color("Silver") translate([0,0,-(MBH-MTH-eps)/2]) // mounting tab
cube([MTW,MHCC,MTH], center = true);
color("Silver") translate([0,MHCC/2,-(MBH-MTH)/2]) // mt.tab rounded end
cylinder(h = MTH, r = MTW/2, center = true, $fn = 32);
color("Silver") translate([0,-MHCC/2,-(MBH-MTH)/2]) // mt.tab rounded end
cylinder(h = MTH, r = MTW/2, center = true, $fn = 32);
color("blue") translate([-(WBD-MBD),0,eps-(MBH-WBH)/2]) // plastic wire box
cube([MBD,WBW,WBH], center = true);
color("blue") translate([-2,0,0])
cube([24.5,16,15], center = true);
}
// mounting holes in tabs on side
color("red") translate([0,MHCC/2,-MBH/2])
cylinder(h = 2, r = 2, center = true, $fn = 32);
color("red") translate([0,-MHCC/2,-MBH/2])
cylinder(h = 2, r = 2, center = true, $fn = 32);
}
}
rotate([180,0,0]) {
StepMotor28BYJ(); // motor body (without wires)
// 5 colored hookup wires
translate([0,0,-(MBH/2 - WRO)]) rotate([0,-90,0])
wires();
}