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gearbox1b.scad
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gearbox1b.scad
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// motor holder
//
// motor has radius of '$mr' with flattened sides at '$mh' and length of '$ml'
// NOTE: some tolerance added
$mr = 10.7; // 10 mm radius + shrinkage
$mh = 15.8; // 15 mm height + shrinkage
$ml = 25.0; // 25.0 mm length excluding 'nubs'
$ml2 = 19.5; // 19.5 mm lengh excluding end cap and shaft guide hole 'nub'
$th = 4.0; // overall thickness of plastic around motor
// NOTE: wall thickness on sides is 1/2 this
// shaft guide hole size
$sh = 3.1; // 3.1mm radius
$sw = 2; // 2mm approximate height of guide
$ft = 1; // 1mm approximate thickness of face
$pr = 2; // 2mm appx radius of post
$sd1 = 0.97 * 2.54 * 1.02 / 2; // shaft radius
$sd2 = 1.01 * 2.54 * 1.02 / 2; // loose shaft radius
// motor shaft extension length
$sl = 10.0; // length of shaft from flat end of motor
$gh = 5.5; // radius of gear hole
// global accuracy parameters
$fn=32; // number of faces in shape
module face(hh)
{
union()
{
difference()
{
linear_extrude(height=hh)
square([$mh + $th, $mr * 2 + $th], true);
translate([0,0,-1])
linear_extrude(height=hh+2)
polygon(points=[[-$mh/2,-$mr],[$mh/2,-$mr],[$mh/2,$mr],[-$mh/2,$mr]]);
}
difference()
{
linear_extrude(height=hh)
polygon(points=[[-$mh/2,-$mr],[$mh/2,-$mr],[$mh/2,$mr],[-$mh/2,$mr]]);
translate([0,0,-1])
linear_extrude(height=hh+2)
circle($mr);
}
}
}
module motor_holder()
{
translate([0,0,$ft])
union()
{
color("green")
face($sw);
color("yellow")
union()
{
translate([-$mh/2,-$mr,0])
linear_extrude(height=$ml2-$sw+1)
circle($pr);
translate([-$mh/2,$mr,0])
linear_extrude(height=$ml2-$sw+1)
circle($pr);
translate([$mh/2,-$mr,0])
linear_extrude(height=$ml2-$sw+1)
circle($pr);
translate([$mh/2,$mr,0])
linear_extrude(height=$ml2-$sw+1)
circle($pr);
}
color("blue")
translate([0, 0, $ml2-$sw])
face($sw);
}
// color("purple")
// difference()
// {
// linear_extrude(height=$ft)
// square([$mh + $th, $mr * 2 + $th], true);
// translate([0,0,-1])
// linear_extrude(height=$ft+2)
// circle($gh);
// }
}
// echo("****************");
// echo("face is ",$mh+$th," by ", $mr * 2 + $th," (mm)");
// echo("overall height is ", $ft + $ml2, " (mm)");
// echo("****************");
$xd = 25.4 / 8 + 0.3; // screw holes
//rotate(a=[0,0,90])
// motor_holder();
color("orange")
difference()
{
translate([20,0,0])
linear_extrude(height=$ft)
square([80,30],true);
// translate([0,0,-1])
// linear_extrude(height=$ft+2)
// circle($gh);
// from gear_test2
// gear wheel radius: 0.125 in 3.175 mm
// Tooth side length: 0.0669041 in 1.69937 mm
// gear radius: 0.185786 in 4.71897 mm
// from gear-test4
// gear wheel radius: 0.4923, in 12.5044 mm
// Tooth side length: 0.0669012 in 1.69929 mm
// gear radius: 0.557684 in 14.1652 mm
translate([3.175+14.1653+0.1, 0,-1])
linear_extrude(height=$ft+2)
circle($sd2);
translate([2*(3.175+14.1653+0.1), 0,-1])
linear_extrude(height=$ft+2)
circle($sd2);
translate([-17,-12,-1])
linear_extrude(height=$ft+2)
circle(d=$xd);
translate([-17,12,-1])
linear_extrude(height=$ft+2)
circle(d=$xd);
translate([57,-12,-1])
linear_extrude(height=$ft+2)
circle(d=$xd);
translate([57,12,-1])
linear_extrude(height=$ft+2)
circle(d=$xd);
}