xyRepRap/lib/nema.scad

// #######################################################
// #################### NEMA Steppers ####################
// #######################################################

$fn = 15;

nema17_size = 42.3;
nema17_hole_off = 30.1 / 2;
nema17_hole_size = 3.2;
nema17_shaft_size = 5.0;
nema17_shaft_length = 24.0;
nema17_center_size = 22.0;
nema17_center_height = 2.0;

nema17_mount_wall = 8.0;
nema17_mount_hole_size = 3.4;
nema17_mount_hole_off_add = 3.5;

nema17_mount_double_high = false;
nema17_mount_back_support = true;

draw_nema17_mount = false;

// #######################################################

if (draw_nema17_mount) nema17_mount(30);

module nema17_holes_face(height, length, hole) {
    translate([nema17_size / 2, nema17_size / 2, height - 4.5]) {
            translate([nema17_hole_off, nema17_hole_off, 0])
                cylinder(d = hole, h = length);
            translate([-nema17_hole_off, nema17_hole_off, 0])
                cylinder(d = hole, h = length);
            translate([nema17_hole_off, -nema17_hole_off, 0])
                cylinder(d = hole, h = length);
            translate([-nema17_hole_off, -nema17_hole_off, 0])
                cylinder(d = hole, h = length);
        }
}

module nema17(length) {
    difference() {
        cube([nema17_size, nema17_size, length]);
        nema17_holes_face(length, 5.0, nema17_hole_size);
    }
    
    translate([nema17_size / 2, nema17_size / 2, length]) {
        cylinder(d = nema17_center_size, h = nema17_center_height);
        cylinder(d = nema17_shaft_size, h = nema17_shaft_length);
    }
}

// TODO use not M4 with 2020 extrusion?
module nema17_mount(slot) {
    // motor faceplate
    difference() {
        cube([nema17_size, nema17_size, nema17_mount_wall]);
        nema17_holes_face(4, nema17_mount_wall + 1, nema17_mount_hole_size);
        
        translate([nema17_size / 2, nema17_size / 2, -1])
            cylinder(d = 24.0, h = nema17_mount_wall + 2);
    }
    
    // mount on side
    translate([nema17_size, 0, 0])
    difference() {
        if (nema17_mount_double_high) {
            cube([nema17_mount_wall, nema17_size, nema17_mount_wall + (2 * slot)]);
        } else {
            cube([nema17_mount_wall, nema17_size, nema17_mount_wall + slot]);
        }
        
        for (i = [0, 1]) {
            translate([nema17_mount_wall + 1, nema17_size / 3 - nema17_mount_hole_off_add, nema17_mount_wall + (slot / 2) + (i * slot)]) {
                    rotate([0, -90, 0])
                        cylinder(d = 4.4, h = nema17_mount_wall + 2);
            
                    translate([0, nema17_size / 3 + (2 * nema17_mount_hole_off_add), 0])
                        rotate([0, -90, 0])
                        cylinder(d = 4.4, h = nema17_mount_wall + 2);
            }
        }
    }
    
    if (nema17_mount_back_support) {
        translate([nema17_size + nema17_mount_wall, 0, 0])
        difference() {
            cube([slot, nema17_size, nema17_mount_wall]);
            
            translate([slot / 2, nema17_size / 3 - nema17_mount_hole_off_add, -1])
                cylinder(d = 4.4, h = nema17_mount_wall + 2);
            
            translate([slot / 2, nema17_size * 2 / 3 + nema17_mount_hole_off_add, -1])
                cylinder(d = 4.4, h = nema17_mount_wall + 2);
        }
    }
}