motors.scad

// License: GPL 2.0

include <lib/mcad/math.scad>



//generates a motor mount for the specified nema standard #.
module stepper_motor_mount(nema_standard,slide_distance=0, mochup=true, tolerance=0)
{
	//dimensions from:
	// http://www.numberfactory.com/NEMA%20Motor%20Dimensions.htm
	if (nema_standard == 17)
	{
		_stepper_motor_mount(
			motor_shaft_diameter = 0.1968*mm_per_inch,
			motor_shaft_length = 0.945*mm_per_inch,
			pilot_diameter = 0.866*mm_per_inch,
			pilot_length = 0.80*mm_per_inch,
			mounting_bolt_circle = 1.725*mm_per_inch,
			bolt_hole_size = 3.5,
			bolt_hole_distance = 1.220*mm_per_inch,
			slide_distance = slide_distance,
			mochup = mochup,
			tolerance=tolerance);
	}
	if (nema_standard == 23)
	{
		_stepper_motor_mount(
			motor_shaft_diameter = 0.250*mm_per_inch,
			motor_shaft_length = 0.81*mm_per_inch,
			pilot_diameter = 1.500*mm_per_inch,
			pilot_length = 0.062*mm_per_inch,
			mounting_bolt_circle = 2.625*mm_per_inch,
			bolt_hole_size = 0.195*mm_per_inch,
			bolt_hole_distance = 1.856*mm_per_inch,
			slide_distance = slide_distance,
			mochup = mochup,
			tolerance=tolerance);
	}
	
}


//inner mehod for creating a stepper motor mount of any dimensions
module _stepper_motor_mount(
	motor_shaft_diameter,
	motor_shaft_length,
	pilot_diameter,
	pilot_length,
	mounting_bolt_circle,
	bolt_hole_size,
	bolt_hole_distance,
	slide_distance = 0,
	motor_length = 40, //arbitray - not standardized
	mochup,
	tolerance = 0
)
{
	union()
	{
		// == centered mount points ==
		//mounting circle inset
		translate([0,slide_distance/2,0]) circle(r = pilot_diameter/2 + tolerance);
		//was causing segfaults.. wtf?
		//square([pilot_diameter+tolerance*2,slide_distance],center=true);
		translate([0,-slide_distance/2,0]) circle(r = pilot_diameter/2+tolerance);

		//todo: motor shaft hole
	
		//mounting screw holes
		for (x = [-1,1]) for (y = [-1,1])
		{
			translate([x*bolt_hole_distance/2,y*bolt_hole_distance/2,0])
			{
				translate([0,slide_distance/2,0]) circle(bolt_hole_size/2+tolerance);
				translate([0,-slide_distance/2,0]) circle(bolt_hole_size/2+tolerance);
				//was causing segfaults.. wtf?
				//square([bolt_hole_size+tolerance*2,slide_distance],center=true);
			}
		}
		// == motor mock-up ==
		//motor box
		if (mochup == true)
		{
			%translate([0,0,-5]) cylinder(h = 5, r = pilot_diameter/2);
			%translate(v=[0,0,-motor_length/2])
			{
				cube(size=[bolt_hole_distance+bolt_hole_size+5,bolt_hole_distance+bolt_hole_size+5,motor_length], center = true);
			}
			//shaft
			%translate(v=[0,0,-(motor_length-motor_shaft_length-2)/2])
			{
				%cylinder(r=motor_shaft_diameter/2,h=motor_length+motor_shaft_length--1, center = true);
			}
		}
	}
}