diff vs i2: +33/-61
$fn = 96;
- // Dimensions
- leaf_len = 30; // Y direction
- leaf_w = 25; // X direction
- leaf_th = 2; // Z thickness
+ // Base dimensions
+ leaf_len = 30; // along Y
+ leaf_w = 25; // along X
+ leaf_th = 2; // along Z
pin_d = 4;
- pin_len = 32;
+ pin_len = 32; // extends 1mm beyond knuckles at both ends
knuckle_od = 8;
knuckle_id = 4.6;
- knuckle_len = 6;
+ knuckle_len = 6; // 30mm / 5
m3_through_d = 3.2;
- m3_csk_top_d = 6;
- m3_csk_depth = 1;
+ m3_csk_top_d = 6;
+ m3_csk_depth = 1;
- // Geometry positions
- // Open 180°: both leaves lie in the same plane, with leaves extending
- // to opposite sides of the hinge axis along X.
- left_leaf_x = -(pin_len/2 + leaf_w/2);
- right_leaf_x = (pin_len/2 + leaf_w/2);
+ // Open 180° layout:
+ // leaves are coplanar in Z, and separated on X so their free edges point away
+ // from the hinge axis. Hinge axis is along Y at X=0.
+ left_leaf_center_x = -(pin_len/2 + leaf_w/2);
+ right_leaf_center_x = (pin_len/2 + leaf_w/2);
- // Knuckles distributed over 30mm in 5 sections of 6mm each.
- // Each knuckle is centered in its section.
- // Left leaf: outer 2 + center 1 => sections 1,3,5 => y = -12, 0, 12
- // Right leaf: middle 2 => sections 2,4 => y = -6, 6
- left_knuckle_y = [-12, 0, 12];
- right_knuckle_y = [-6, 6];
+ left_knuckle_y = [-12, 0, 12]; // 3 segments: 1,3,5
+ right_knuckle_y = [-6, 6]; // 2 segments: 2,4
- // M3 holes: 3 per leaf, along Y at 8mm pitch, placed on the side
- // away from the knuckles.
+ // M3 holes: 3 per leaf, spaced 8mm along Y, on the side away from knuckles.
hole_y = [-8, 0, 8];
- module leaf_plate(side=1) {
- // side: -1 left, +1 right
+ module leaf_plate(side = -1) {
translate([side * (pin_len/2 + leaf_w/2), 0, 0])
cube([leaf_w, leaf_len, leaf_th], center=true);
}
module knuckle_segment(yc) {
translate([0, yc, 0])
difference() {
cylinder(d=knuckle_od, h=knuckle_len, center=true);
cylinder(d=knuckle_id, h=knuckle_len + 2, center=true);
}
}
module pin_axis() {
- // Pin axis is centered on X=0, Z=0 and runs along Y
- rotate([90,0,0])
+ rotate([90, 0, 0])
cylinder(d=pin_d, h=pin_len, center=true);
}
- module countersunk_hole_at(x, y) {
- // Through-hole
- translate([x, y, 0])
- cylinder(d=m3_through_d, h=leaf_th + 0.4, center=true);
+ module leaf_with_knuckles(side = -1) {
+ leaf_x = side < 0 ? left_leaf_center_x : right_leaf_center_x;
+ knuckles = side < 0 ? left_knuckle_y : right_knuckle_y;
+ hole_x = side < 0 ? (leaf_x + leaf_w/2 - 0.8) : (leaf_x - leaf_w/2 + 0.8);
+ csk_dir = side < 0 ? 1 : -1;
- // Countersink from the outer face of the leaf
- // Left leaf outer face is x = left_leaf_x - leaf_w/2
- // Right leaf outer face is x = right_leaf_x + leaf_w/2
- }
-
- module leaf_with_knuckles(side=1) {
- // side: -1 left leaf, +1 right leaf
- holes_x = side < 0 ? (left_leaf_x - leaf_w/2 + 0.8) : (right_leaf_x + leaf_w/2 - 0.8);
- csk_dir = side < 0 ? -1 : 1;
-
difference() {
union() {
- // Leaf plate
- translate([side * (pin_len/2 + leaf_w/2), 0, 0])
+ translate([leaf_x, 0, 0])
cube([leaf_w, leaf_len, leaf_th], center=true);
- // Knuckles
- if (side < 0) {
- for (yy = left_knuckle_y)
- knuckle_segment(yy);
- } else {
- for (yy = right_knuckle_y)
- knuckle_segment(yy);
- }
+ for (yy = knuckles)
+ knuckle_segment(yy);
}
- // M3 through holes + countersinks
+ // Through holes
for (yy = hole_y) {
- translate([holes_x, yy, 0]) {
- // through
- cube([0,0,0]); // no-op to keep scope simple
-
- // Drill through along X
- rotate([0,90,0])
+ translate([hole_x, yy, 0])
+ rotate([0, 90, 0])
cylinder(d=m3_through_d, h=leaf_w + 2, center=true);
- // Countersink from outer face
- translate([csk_dir * (leaf_w/2 - 0.01), 0, 0])
- rotate([0,90,0])
- cylinder(d1=m3_csk_top_d, d2=m3_through_d, h=m3_csk_depth, center=false);
- }
+ // Countersink from the outer face of the leaf
+ translate([leaf_x + csk_dir * leaf_w/2, yy, 0])
+ rotate([0, 90, 0])
+ cylinder(d1=m3_csk_top_d, d2=m3_through_d, h=m3_csk_depth, center=false);
}
}
}
union() {
leaf_with_knuckles(-1);
leaf_with_knuckles(+1);
pin_axis();
}
SCAD (82 lines)
$fn = 96;
// Base dimensions
leaf_len = 30; // along Y
leaf_w = 25; // along X
leaf_th = 2; // along Z
pin_d = 4;
pin_len = 32; // extends 1mm beyond knuckles at both ends
knuckle_od = 8;
knuckle_id = 4.6;
knuckle_len = 6; // 30mm / 5
m3_through_d = 3.2;
m3_csk_top_d = 6;
m3_csk_depth = 1;
// Open 180° layout:
// leaves are coplanar in Z, and separated on X so their free edges point away
// from the hinge axis. Hinge axis is along Y at X=0.
left_leaf_center_x = -(pin_len/2 + leaf_w/2);
right_leaf_center_x = (pin_len/2 + leaf_w/2);
left_knuckle_y = [-12, 0, 12]; // 3 segments: 1,3,5
right_knuckle_y = [-6, 6]; // 2 segments: 2,4
// M3 holes: 3 per leaf, spaced 8mm along Y, on the side away from knuckles.
hole_y = [-8, 0, 8];
module leaf_plate(side = -1) {
translate([side * (pin_len/2 + leaf_w/2), 0, 0])
cube([leaf_w, leaf_len, leaf_th], center=true);
}
module knuckle_segment(yc) {
translate([0, yc, 0])
difference() {
cylinder(d=knuckle_od, h=knuckle_len, center=true);
cylinder(d=knuckle_id, h=knuckle_len + 2, center=true);
}
}
module pin_axis() {
rotate([90, 0, 0])
cylinder(d=pin_d, h=pin_len, center=true);
}
module leaf_with_knuckles(side = -1) {
leaf_x = side < 0 ? left_leaf_center_x : right_leaf_center_x;
knuckles = side < 0 ? left_knuckle_y : right_knuckle_y;
hole_x = side < 0 ? (leaf_x + leaf_w/2 - 0.8) : (leaf_x - leaf_w/2 + 0.8);
csk_dir = side < 0 ? 1 : -1;
difference() {
union() {
translate([leaf_x, 0, 0])
cube([leaf_w, leaf_len, leaf_th], center=true);
for (yy = knuckles)
knuckle_segment(yy);
}
// Through holes
for (yy = hole_y) {
translate([hole_x, yy, 0])
rotate([0, 90, 0])
cylinder(d=m3_through_d, h=leaf_w + 2, center=true);
// Countersink from the outer face of the leaf
translate([leaf_x + csk_dir * leaf_w/2, yy, 0])
rotate([0, 90, 0])
cylinder(d1=m3_csk_top_d, d2=m3_through_d, h=m3_csk_depth, center=false);
}
}
}
union() {
leaf_with_knuckles(-1);
leaf_with_knuckles(+1);
pin_axis();
}
