openscad gear worm for a repurposed sg 5010 motor 15:1 ratio

though keep mind the metal gear that came with sg 5010 is kinda small so this just to repurpose the thing

also use a super strong glue

include <BOSL2/std.scad>

include <BOSL2/gears.scad>

/ [Visibility Control] /

show_worm = true;

// Set this to true to see ONLY the internal hole/shaft shape

show_worm_shaft_only = false;

show_compound = true;

show_cyan_gear = true;

show_motor = true;

/ [Primary Worm External Specs] /

worm_od = 24.0;

worm_height = 14.0;

/ [Primary Worm Internal Shaft - Manual Sizing] /

worm_bottom_hole_d = 5;

worm_bottom_hole_h = 7.0;

worm_bottom_hole_z_offset = 0.0;

worm_socket_h = 6.0;

worm_socket_z_offset = 8.0; // Sits at the top (14mm worm)

worm_top_hole_d = 5.15;

worm_top_hole_h = 10.0;

worm_top_hole_z_offset = 7.0;

/ [Cyan Gear Specs] /

cyan_gear_teeth = 15;

cyan_gear_pitch = 2.932;

cyan_gear_thick = 6.0;

cyan_gear_shave = 0.15;

cyan_shaft_d = 3.6;

/ [Secondary Gear, Worm, and Shaft] /

secondary_gear_teeth = 15;

secondary_gear_pitch = 2.932;

secondary_gear_thick = 24.0; // The "Long Spur"

secondary_worm_height = 14.0; // The gold worm part

secondary_shaft_d = 5.15; // Diameter of the central hole

/ [DC Motor Specs] /

master_shaft_d = 3.6;

motor_d = 17.0;

motor_h = 24.2;

boss_h = 1.5;

/ [Nudges - Adjust these to move the Secondary Assembly] /

compound_x_nudge = -19;

compound_y_nudge = 13.5;

compound_z_nudge = 7.0;

/ [Rendering Quality] /

$fn = 64;

// --- MATH ---

pd_worm = worm_od - (cyan_gear_pitch / PI);

// --- MAIN EXECUTION ---

move([0, 0, boss_h]) {

if (show_worm_shaft_only) {

render_worm_internal_shaft();

} else if (show_worm) {

render_stepped_worm();

}

if (show_compound) {

zrot(90)

move([compound_x_nudge, compound_y_nudge, compound_z_nudge])

xrot(90)

render_secondary_gear_worm_shaft("lime");

}

if (show_cyan_gear) {

move([0, 0, worm_socket_z_offset])

render_spur_gear("cyan");

}

if (show_motor) {

color("silver", 0.5)

move([0, 0, worm_socket_z_offset + cyan_gear_thick + motor_h + boss_h])

yrot(180)

render_dc_motor();

}

}

// --- MODULES ---

module render_secondary_gear_worm_shaft(col = "lime") {

difference() {

union() {

// The Long Spur (Secondary Gear)

color(col)

spur_gear(

circ_pitch = secondary_gear_pitch,

teeth = secondary_gear_teeth,

thickness = secondary_gear_thick,

anchor = BOTTOM

);

// The Worm (Secondary Worm)

color("gold")

move([0, 0, secondary_gear_thick])

worm(

circ_pitch = secondary_gear_pitch,

d = pd_worm,

l = secondary_worm_height,

anchor = BOTTOM

);

}

// The central hole (Secondary Shaft)

// Nudged height by +2 to ensure clean subtraction

move([0, 0, -1])

cyl(d = secondary_shaft_d, h = secondary_gear_thick + secondary_worm_height + 2, anchor = BOTTOM);

}

}

module render_worm_internal_shaft() {

color("red") {

move([0, 0, worm_bottom_hole_z_offset])

cyl(d = worm_bottom_hole_d, h = worm_bottom_hole_h, anchor = BOTTOM);

move([0, 0, worm_socket_z_offset])

spur_gear(

circ_pitch = cyan_gear_pitch,

teeth = cyan_gear_teeth,

thickness = worm_socket_h + 0.05,

shaved = cyan_gear_shave,

anchor = BOTTOM

);

move([0, 0, worm_top_hole_z_offset])

cyl(d = worm_top_hole_d, h = worm_top_hole_h, anchor = BOTTOM);

}

}

module render_stepped_worm() {

difference() {

color("gold", 0.6)

worm(circ_pitch = cyan_gear_pitch, d = pd_worm, l = worm_height, anchor = BOTTOM);

move([0, 0, -0.01])

render_worm_internal_shaft();

}

}

module render_spur_gear(col = "cyan") {

difference() {

color(col)

spur_gear(

circ_pitch = cyan_gear_pitch,

teeth = cyan_gear_teeth,

thickness = cyan_gear_thick,

anchor = BOTTOM

);

cyl(d = cyan_shaft_d + 0.15, h = cyan_gear_thick + 2, anchor = BOTTOM);

}

}

module render_dc_motor() {

cyl(d = motor_d, h = motor_h, anchor = BOTTOM);

color("gray")

move([0, 0, motor_h])

cyl(d = 6.5, h = boss_h, anchor = BOTTOM);

color("darkgray")

move([0, 0, motor_h + boss_h])

cyl(d = master_shaft_d, h = cyan_gear_thick, anchor = BOTTOM);

}