tier-3-butt-hinge / claude-opus-4-7

// Butt hinge - opened 180 degrees
// Pin axis along Y, leaves in XY plane (Z=0 mid-plane of leaves)

$fn = 64;

leaf_w = 25;     // x extent of leaf (from knuckle edge outward)
leaf_h = 30;     // y extent (along pin axis)
leaf_t = 2;      // thickness
knuckle_od = 8;
knuckle_id = 4.6;
pin_d = 4;
pin_len = 32;
seg = 6;         // each knuckle segment length (30/5)

// Screw holes: 3 per leaf, pitch 8mm along Y, centered on leaf
screw_pitch = 8;
screw_through_d = 3.2;
csk_d = 6;
csk_depth = 1;

// Leaf: flat plate from x=knuckle_od/2 outward (no, plate extends from x=0 to x=leaf_w on right, mirrored on left)
// But plate must connect to knuckle. Plate centered on z=0, thickness leaf_t.
// Plate spans x in [knuckle_od/2 ... knuckle_od/2 + leaf_w] roughly, but knuckle radius 4 so plate starts at x=4.
// We'll make plate from x=0 to x=leaf_w (the part inside knuckle gets unioned with knuckle).

module leaf_plate(side) {
    // side = +1 (right, x>0) or -1 (left, x<0)
    // plate: width leaf_w in x, height leaf_h in y, thickness leaf_t in z
    // Screw hole center: place 3 holes along y, centered, at x near far end
    screw_x = side * (leaf_w - 5); // 5mm from outer edge
    difference() {
        translate([side > 0 ? 0 : -leaf_w, -leaf_h/2, -leaf_t/2])
            cube([leaf_w, leaf_h, leaf_t]);
        // screw holes (countersunk from top, +Z face)
        for (i = [-1, 0, 1]) {
            translate([screw_x, i*screw_pitch, 0]) {
                // through hole
                translate([0,0,-leaf_t/2 - 0.1])
                    cylinder(d=screw_through_d, h=leaf_t + 0.2);
                // countersink (taper) on top face
                translate([0,0,leaf_t/2 - csk_depth])
                    cylinder(d1=screw_through_d, d2=csk_d, h=csk_depth + 0.01);
            }
        }
    }
}

module knuckle_seg(y0) {
    translate([0, y0, 0])
        rotate([-90,0,0])
            difference() {
                cylinder(d=knuckle_od, h=seg);
                translate([0,0,-0.1])
                    cylinder(d=knuckle_id, h=seg+0.2);
            }
}

// Left leaf: knuckles at segments 0,2,4 (outer two + center)
module left_leaf() {
    color("silver") {
        union() {
            leaf_plate(-1);
            // segments y in [-15,-9], [-3,3], [9,15] => y0 = -15, -3, 9
            knuckle_seg(-15);
            knuckle_seg(-3);
            knuckle_seg(9);
        }
    }
}

// Right leaf: knuckles at segments 1,3 => y0 = -9, 3
module right_leaf() {
    color("silver") {
        union() {
            leaf_plate(+1);
            knuckle_seg(-9);
            knuckle_seg(3);
        }
    }
}

module pin() {
    color("gold")
        translate([0, -pin_len/2, 0])
            rotate([-90,0,0])
                cylinder(d=pin_d, h=pin_len);
}

left_leaf();
right_leaf();
pin();

// 小型バット蝶番 (butt hinge) - 180°開いた状態

$fn = 64;

// パラメータ
leaf_w = 25;       // 板の横幅(回転で開く方向)
leaf_h = 30;       // 板の縦(ヒンジ軸方向)
leaf_t = 2;        // 板厚
pin_d = 4;         // ピン直径
pin_len = 32;      // ピン長
knuckle_od = 8;    // knuckle外径
knuckle_id = 4.6;  // knuckle内径(クリアランス込み)
seg_h = 6;         // knuckle各セグメント高さ
n_seg = 5;         // 分割数

// 皿穴
csk_outer = 6;
csk_depth = 1;
hole_d = 3.2;

// セグメントY位置(中心)
function seg_y(i) = -leaf_h/2 + seg_h/2 + i*seg_h;

// 皿穴付き貫通(板厚方向 z)
module screw_hole() {
    // 貫通穴
    translate([0,0,-0.1])
        cylinder(d=hole_d, h=leaf_t+0.2);
    // 皿テーパ(上面 z=leaf_t/2 から下に depth)
    translate([0,0,leaf_t/2 - csk_depth])
        cylinder(d1=hole_d, d2=csk_outer, h=csk_depth + 0.01);
}

// 左板(knuckle: セグメント 0, 2, 4)
module left_leaf() {
    color("silver")
    difference() {
        union() {
            // 板本体: x<0 側に伸びる
            // knuckle と接する側は X=0 から少し内側まで
            // 板の x=0 側端は knuckle 中心に届く
            translate([-leaf_w, -leaf_h/2, -leaf_t/2])
                cube([leaf_w, leaf_h, leaf_t]);
            
            // knuckle 3個 (i=0,2,4)
            for (i = [0, 2, 4]) {
                translate([0, seg_y(i) - seg_h/2, 0])
                    rotate([-90, 0, 0])
                        cylinder(d=knuckle_od, h=seg_h);
            }
        }
        
        // ピン穴
        translate([0, -leaf_h/2 - 1, 0])
            rotate([-90, 0, 0])
                cylinder(d=knuckle_id, h=leaf_h + 2);
        
        // ネジ穴3個(板の縦方向 8mm 間隔、knuckleから離れた側)
        // 横方向: knuckle側から離れた位置
        screw_x = -leaf_w + 8;
        for (i = [-1, 0, 1]) {
            translate([screw_x, i*8, 0])
                screw_hole();
        }
    }
}

// 右板(knuckle: セグメント 1, 3)
module right_leaf() {
    color("silver")
    difference() {
        union() {
            translate([0, -leaf_h/2, -leaf_t/2])
                cube([leaf_w, leaf_h, leaf_t]);
            
            for (i = [1, 3]) {
                translate([0, seg_y(i) - seg_h/2, 0])
                    rotate([-90, 0, 0])
                        cylinder(d=knuckle_od, h=seg_h);
            }
        }
        
        translate([0, -leaf_h/2 - 1, 0])
            rotate([-90, 0, 0])
                cylinder(d=knuckle_id, h=leaf_h + 2);
        
        screw_x = leaf_w - 8;
        for (i = [-1, 0, 1]) {
            translate([screw_x, i*8, 0])
                screw_hole();
        }
    }
}

// ピン軸
module pin() {
    color("gold")
    translate([0, -pin_len/2, 0])
        rotate([-90, 0, 0])
            cylinder(d=pin_d, h=pin_len);
}

// 配置
left_leaf();
right_leaf();
pin();

// 小型バット蝶番（家具用）
// 開いた状態（180°）

$fn = 64;

// パラメータ
leaf_length = 30;      // 板の縦（ピン軸方向）
leaf_width = 25;       // 板の横（開く方向）
leaf_thick = 2;        // 板厚
pin_dia = 4;           // ピン軸直径
pin_len = 32;          // ピン長さ
knuckle_od = 8;        // knuckle 外径
knuckle_id = pin_dia + 0.3;  // 4.6mm
knuckle_seg = leaf_length / 5;  // 6mm
clearance = 0.2;       // knuckle 同士のクリアランス（モデル上は 0 でも可）

// 皿穴パラメータ
csk_outer_dia = 6;
csk_depth = 1;
csk_through_dia = 3.2;
hole_pitch = 8;

// ===== knuckle（筒）モジュール =====
// Y方向に長さ seg_len の筒を、Y=y0 を始点として作る
module knuckle(y0, seg_len) {
    translate([0, y0, 0])
        rotate([-90, 0, 0])
            difference() {
                cylinder(d = knuckle_od, h = seg_len);
                translate([0, 0, -0.1])
                    cylinder(d = knuckle_id, h = seg_len + 0.2);
            }
}

// ===== 板の平板部分（knuckle 側を knuckle と接続するための形状）=====
// 板は厚さ leaf_thick、縦 leaf_length、横 leaf_width
// 板の knuckle 側端は knuckle 外径の半分（半径 4mm）に接する位置から伸びる
// X=0（ピン軸中心）から見て、板はピン軸の中心からオフセットした位置に配置
//
// 開いた状態で板の表面（皿穴側、外側）は Z = +leaf_thick/2 にしたい
// → 平らな面の中央 Z = 0、板の上面 Z = +1、下面 Z = -1
// knuckle 外径 8mm（半径 4mm）の中心は X=0, Y は leaf 中心、Z=0
// 板はピン中心線から横方向に伸び、knuckle の外周に接続する
// 左板: x < 0 側に伸びる。板の右端（knuckle 接続側）は X = 0 で knuckle と接する
//      → 板の右端は X = 0、左端は X = -leaf_width
//      knuckle と板の重なり部分: knuckle 半径 4mm、板厚 1mm 上下
//      板を knuckle の中心側まで伸ばして hull で接続するのが一般的
// 右板: x > 0 側に伸びる。板の左端（knuckle 接続側）は X = 0
//      → 板の左端は X = 0、右端は X = +leaf_width

// 左板の平板部
module left_leaf_plate() {
    // 板の右端が knuckle 中心 X=0 まで来るようにする
    // 板: X = [-leaf_width, 0], Y = [0, leaf_length], Z = [-leaf_thick/2, +leaf_thick/2]
    translate([-leaf_width, 0, -leaf_thick/2])
        cube([leaf_width, leaf_length, leaf_thick]);
}

module right_leaf_plate() {
    // 板: X = [0, leaf_width], Y = [0, leaf_length], Z = [-leaf_thick/2, +leaf_thick/2]
    translate([0, 0, -leaf_thick/2])
        cube([leaf_width, leaf_length, leaf_thick]);
}

// ===== 皿穴モジュール =====
// 板の表面（Z = +leaf_thick/2）から見て皿穴。Z軸方向に貫通
module countersunk_hole() {
    // 貫通穴
    translate([0, 0, -leaf_thick/2 - 0.1])
        cylinder(d = csk_through_dia, h = leaf_thick + 0.2);
    // 皿穴部（テーパ）: 表面で 6mm、深さ 1mm で 3.2mm に絞る
    translate([0, 0, leaf_thick/2 - csk_depth])
        cylinder(d1 = csk_through_dia, d2 = csk_outer_dia, h = csk_depth + 0.01);
}

// ===== 左板（皿穴付き、knuckle 3個付き）=====
module left_leaf() {
    difference() {
        union() {
            left_leaf_plate();
            // knuckle: 外側2個 + 中央1個
            // 5等分の区切り: Y = 0,6,12,18,24,30
            // 左板は区間 [0,6], [12,18], [24,30]
            knuckle(0, knuckle_seg);
            knuckle(2 * knuckle_seg, knuckle_seg);
            knuckle(4 * knuckle_seg, knuckle_seg);
        }
        // 皿穴 3個（板の knuckle から離れた側 = 左板では x が小さい側）
        // Y方向の位置: 中央 Y = leaf_length/2 = 15、ピッチ 8mm → Y = 7, 15, 23
        // X方向の位置: 板の中央付近、knuckle から離れた側
        // 板は X=[-25,0]、knuckle 側 = X=0 付近、離れた側 = X=-25 付近
        // 皿穴中心 X は板の中央寄り、knuckle から離れた側
        // ここでは X = -leaf_width/2 = -12.5 とする（板中央）
        // ただし「knuckle から離れた側」を強調するなら X = -leaf_width + 8 = -17 など
        // ここは板中央に配置
        for (i = [0:2]) {
            translate([-leaf_width/2 + 5, leaf_length/2 + (i-1) * hole_pitch, 0])
                countersunk_hole();
        }
        // ピン軸通し穴（knuckle 部分は既に内径あるが、念のため板部にも貫通させない）
    }
}

// ===== 右板（皿穴付き、knuckle 2個付き）=====
module right_leaf() {
    difference() {
        union() {
            right_leaf_plate();
            // knuckle: 中間2個
            // 右板は区間 [6,12], [18,24]
            knuckle(knuckle_seg, knuckle_seg);
            knuckle(3 * knuckle_seg, knuckle_seg);
        }
        // 皿穴 3個
        for (i = [0:2]) {
            translate([leaf_width/2 - 5, leaf_length/2 + (i-1) * hole_pitch, 0])
                countersunk_hole();
        }
    }
}

// ===== ピン軸 =====
module pin() {
    // Y軸方向、Y = -1 から Y = leaf_length + 1 まで（長さ 32mm）
    translate([0, -1, 0])
        rotate([-90, 0, 0])
            cylinder(d = pin_dia, h = pin_len);
}

// ===== 組み立て（180° 開いた状態）=====
// 色分けして出力
color("Silver") left_leaf();
color("Gray") right_leaf();
color("DarkGray") pin();

// Small butt hinge - opened 180 degrees
// Pin axis along Y, leaves on Z=0 plane

$fn = 64;

// ---- Parameters ----
leaf_long   = 30;   // along Y (hinge axis)
leaf_wide   = 25;   // along X (away from axis)
leaf_thick  = 2;

pin_dia     = 4;
pin_len     = 32;

knuckle_od  = 8;
knuckle_id  = pin_dia + 0.6;   // 4.6 mm hole
knuckle_seg = 6;               // 30/5

screw_clear = 3.2;
csk_dia     = 6;
csk_depth   = 1;
screw_count = 3;
screw_pitch = 8;

// ---- Knuckle (hollow cylinder) along Y ----
module knuckle(y_start, length) {
    translate([0, y_start, 0])
        rotate([-90, 0, 0])
            difference() {
                cylinder(h = length, d = knuckle_od);
                translate([0, 0, -0.1])
                    cylinder(h = length + 0.2, d = knuckle_id);
            }
}

// ---- Leaf plate with countersunk holes ----
// Plate extends from x = x_inner to x = x_inner + sign*leaf_wide
// The plate's inner edge (near knuckle) is tangent to knuckle OD
module leaf_plate(direction = 1) {
    // direction = -1 (left) or +1 (right)
    inner_x = direction * (knuckle_od / 2);
    outer_x = inner_x + direction * leaf_wide;
    x_min = min(inner_x, outer_x);

    difference() {
        // Plate: top face at z=0, bottom at z=-leaf_thick
        translate([x_min, -leaf_long/2, -leaf_thick])
            cube([leaf_wide, leaf_long, leaf_thick]);

        // Screw holes - centered along plate width, on far side from knuckle
        // Position screws roughly at 2/3 from knuckle (away from knuckle)
        screw_x = inner_x + direction * (leaf_wide * 0.65);

        for (i = [0 : screw_count - 1]) {
            y = -((screw_count - 1) * screw_pitch) / 2 + i * screw_pitch;

            // Through hole
            translate([screw_x, y, -leaf_thick - 0.1])
                cylinder(h = leaf_thick + 0.2, d = screw_clear);

            // Countersink (taper) - opens upward (top surface at z=0)
            translate([screw_x, y, -csk_depth])
                cylinder(h = csk_depth + 0.01,
                         d1 = screw_clear, d2 = csk_dia);
        }
    }
}

// ---- Left leaf: knuckles at outer (0..6, 24..30) and center (12..18) ----
module left_leaf() {
    color("silver") {
        leaf_plate(-1);
        // Knuckle Y positions (relative to leaf center at y=0):
        // segments: [-15,-9], [-9,-3], [-3,3], [3,9], [9,15]
        knuckle(-15, knuckle_seg);   // outer
        knuckle(-3,  knuckle_seg);   // center
        knuckle(9,   knuckle_seg);   // outer
    }
}

// ---- Right leaf: knuckles in intermediate positions (6..12, 18..24) ----
module right_leaf() {
    color("gainsboro") {
        leaf_plate(1);
        knuckle(-9, knuckle_seg);
        knuckle(3,  knuckle_seg);
    }
}

// ---- Pin ----
module pin() {
    color("dimgray")
        translate([0, -pin_len/2, 0])
            rotate([-90, 0, 0])
                cylinder(h = pin_len, d = pin_dia);
}

// ---- Assembly (180° open) ----
left_leaf();
right_leaf();
pin();

// 小型バット蝶番 (butt hinge) - 180°開いた状態

$fn = 64;

// パラメータ
leaf_w = 25;       // 板の横幅(回転で開く方向)
leaf_h = 30;       // 板の縦(ヒンジ軸方向)
leaf_t = 2;        // 板厚
pin_d = 4;         // ピン直径
pin_len = 32;      // ピン長
knuckle_od = 8;    // knuckle外径
knuckle_id = 4.6;  // knuckle内径(クリアランス込み)
seg_h = 6;         // knuckle各セグメント高さ
n_seg = 5;         // 分割数

// 皿穴
csk_outer = 6;
csk_depth = 1;
hole_d = 3.2;

// セグメントY位置(中心)
function seg_y(i) = -leaf_h/2 + seg_h/2 + i*seg_h;

// 皿穴付き貫通(板厚方向 z)
module screw_hole() {
    // 貫通穴
    translate([0,0,-0.1])
        cylinder(d=hole_d, h=leaf_t+0.2);
    // 皿テーパ(上面 z=leaf_t/2 から下に depth)
    translate([0,0,leaf_t/2 - csk_depth])
        cylinder(d1=hole_d, d2=csk_outer, h=csk_depth + 0.01);
}

// 左板(knuckle: セグメント 0, 2, 4)
module left_leaf() {
    color("silver")
    difference() {
        union() {
            // 板本体: x<0 側に伸びる
            // knuckle と接する側は X=0 から少し内側まで
            // 板の x=0 側端は knuckle 中心に届く
            translate([-leaf_w, -leaf_h/2, -leaf_t/2])
                cube([leaf_w, leaf_h, leaf_t]);
            
            // knuckle 3個 (i=0,2,4)
            for (i = [0, 2, 4]) {
                translate([0, seg_y(i) - seg_h/2, 0])
                    rotate([-90, 0, 0])
                        cylinder(d=knuckle_od, h=seg_h);
            }
        }
        
        // ピン穴
        translate([0, -leaf_h/2 - 1, 0])
            rotate([-90, 0, 0])
                cylinder(d=knuckle_id, h=leaf_h + 2);
        
        // ネジ穴3個(板の縦方向 8mm 間隔、knuckleから離れた側)
        // 横方向: knuckle側から離れた位置
        screw_x = -leaf_w + 8;
        for (i = [-1, 0, 1]) {
            translate([screw_x, i*8, 0])
                screw_hole();
        }
    }
}

// 右板(knuckle: セグメント 1, 3)
module right_leaf() {
    color("silver")
    difference() {
        union() {
            translate([0, -leaf_h/2, -leaf_t/2])
                cube([leaf_w, leaf_h, leaf_t]);
            
            for (i = [1, 3]) {
                translate([0, seg_y(i) - seg_h/2, 0])
                    rotate([-90, 0, 0])
                        cylinder(d=knuckle_od, h=seg_h);
            }
        }
        
        translate([0, -leaf_h/2 - 1, 0])
            rotate([-90, 0, 0])
                cylinder(d=knuckle_id, h=leaf_h + 2);
        
        screw_x = leaf_w - 8;
        for (i = [-1, 0, 1]) {
            translate([screw_x, i*8, 0])
                screw_hole();
        }
    }
}

// ピン軸
module pin() {
    color("gold")
    translate([0, -pin_len/2, 0])
        rotate([-90, 0, 0])
            cylinder(d=pin_d, h=pin_len);
}

// 配置
left_leaf();
right_leaf();
pin();

// 小型バット蝶番（家具用）
// 開いた状態（180°）

$fn = 64;

// パラメータ
leaf_length = 30;      // 板の縦（ピン軸方向）
leaf_width = 25;       // 板の横（開く方向）
leaf_thick = 2;        // 板厚
pin_dia = 4;           // ピン軸直径
pin_len = 32;          // ピン長さ
knuckle_od = 8;        // knuckle 外径
knuckle_id = pin_dia + 0.3;  // 4.6mm
knuckle_seg = leaf_length / 5;  // 6mm
clearance = 0.2;       // knuckle 同士のクリアランス（モデル上は 0 でも可）

// 皿穴パラメータ
csk_outer_dia = 6;
csk_depth = 1;
csk_through_dia = 3.2;
hole_pitch = 8;

// ===== knuckle（筒）モジュール =====
// Y方向に長さ seg_len の筒を、Y=y0 を始点として作る
module knuckle(y0, seg_len) {
    translate([0, y0, 0])
        rotate([-90, 0, 0])
            difference() {
                cylinder(d = knuckle_od, h = seg_len);
                translate([0, 0, -0.1])
                    cylinder(d = knuckle_id, h = seg_len + 0.2);
            }
}

// ===== 板の平板部分（knuckle 側を knuckle と接続するための形状）=====
// 板は厚さ leaf_thick、縦 leaf_length、横 leaf_width
// 板の knuckle 側端は knuckle 外径の半分（半径 4mm）に接する位置から伸びる
// X=0（ピン軸中心）から見て、板はピン軸の中心からオフセットした位置に配置
//
// 開いた状態で板の表面（皿穴側、外側）は Z = +leaf_thick/2 にしたい
// → 平らな面の中央 Z = 0、板の上面 Z = +1、下面 Z = -1
// knuckle 外径 8mm（半径 4mm）の中心は X=0, Y は leaf 中心、Z=0
// 板はピン中心線から横方向に伸び、knuckle の外周に接続する
// 左板: x < 0 側に伸びる。板の右端（knuckle 接続側）は X = 0 で knuckle と接する
//      → 板の右端は X = 0、左端は X = -leaf_width
//      knuckle と板の重なり部分: knuckle 半径 4mm、板厚 1mm 上下
//      板を knuckle の中心側まで伸ばして hull で接続するのが一般的
// 右板: x > 0 側に伸びる。板の左端（knuckle 接続側）は X = 0
//      → 板の左端は X = 0、右端は X = +leaf_width

// 左板の平板部
module left_leaf_plate() {
    // 板の右端が knuckle 中心 X=0 まで来るようにする
    // 板: X = [-leaf_width, 0], Y = [0, leaf_length], Z = [-leaf_thick/2, +leaf_thick/2]
    translate([-leaf_width, 0, -leaf_thick/2])
        cube([leaf_width, leaf_length, leaf_thick]);
}

module right_leaf_plate() {
    // 板: X = [0, leaf_width], Y = [0, leaf_length], Z = [-leaf_thick/2, +leaf_thick/2]
    translate([0, 0, -leaf_thick/2])
        cube([leaf_width, leaf_length, leaf_thick]);
}

// ===== 皿穴モジュール =====
// 板の表面（Z = +leaf_thick/2）から見て皿穴。Z軸方向に貫通
module countersunk_hole() {
    // 貫通穴
    translate([0, 0, -leaf_thick/2 - 0.1])
        cylinder(d = csk_through_dia, h = leaf_thick + 0.2);
    // 皿穴部（テーパ）: 表面で 6mm、深さ 1mm で 3.2mm に絞る
    translate([0, 0, leaf_thick/2 - csk_depth])
        cylinder(d1 = csk_through_dia, d2 = csk_outer_dia, h = csk_depth + 0.01);
}

// ===== 左板（皿穴付き、knuckle 3個付き）=====
module left_leaf() {
    difference() {
        union() {
            left_leaf_plate();
            // knuckle: 外側2個 + 中央1個
            // 5等分の区切り: Y = 0,6,12,18,24,30
            // 左板は区間 [0,6], [12,18], [24,30]
            knuckle(0, knuckle_seg);
            knuckle(2 * knuckle_seg, knuckle_seg);
            knuckle(4 * knuckle_seg, knuckle_seg);
        }
        // 皿穴 3個（板の knuckle から離れた側 = 左板では x が小さい側）
        // Y方向の位置: 中央 Y = leaf_length/2 = 15、ピッチ 8mm → Y = 7, 15, 23
        // X方向の位置: 板の中央付近、knuckle から離れた側
        // 板は X=[-25,0]、knuckle 側 = X=0 付近、離れた側 = X=-25 付近
        // 皿穴中心 X は板の中央寄り、knuckle から離れた側
        // ここでは X = -leaf_width/2 = -12.5 とする（板中央）
        // ただし「knuckle から離れた側」を強調するなら X = -leaf_width + 8 = -17 など
        // ここは板中央に配置
        for (i = [0:2]) {
            translate([-leaf_width/2 + 5, leaf_length/2 + (i-1) * hole_pitch, 0])
                countersunk_hole();
        }
        // ピン軸通し穴（knuckle 部分は既に内径あるが、念のため板部にも貫通させない）
    }
}

// ===== 右板（皿穴付き、knuckle 2個付き）=====
module right_leaf() {
    difference() {
        union() {
            right_leaf_plate();
            // knuckle: 中間2個
            // 右板は区間 [6,12], [18,24]
            knuckle(knuckle_seg, knuckle_seg);
            knuckle(3 * knuckle_seg, knuckle_seg);
        }
        // 皿穴 3個
        for (i = [0:2]) {
            translate([leaf_width/2 - 5, leaf_length/2 + (i-1) * hole_pitch, 0])
                countersunk_hole();
        }
    }
}

// ===== ピン軸 =====
module pin() {
    // Y軸方向、Y = -1 から Y = leaf_length + 1 まで（長さ 32mm）
    translate([0, -1, 0])
        rotate([-90, 0, 0])
            cylinder(d = pin_dia, h = pin_len);
}

// ===== 組み立て（180° 開いた状態）=====
// 色分けして出力
color("Silver") left_leaf();
color("Gray") right_leaf();
color("DarkGray") pin();

// Small butt hinge - 180° open state
// Pin axis along Y, leaves on Z=0 plane
// Left leaf: x<0, knuckles at segments 0,2,4 (outer + middle)
// Right leaf: x>0, knuckles at segments 1,3 (between)

$fn = 64;

// Parameters
leaf_w = 25;       // leaf width (X direction from hinge axis)
leaf_h = 30;       // leaf height (along Y, hinge axis)
leaf_t = 2;        // leaf thickness
knuckle_od = 8;    // knuckle outer diameter
knuckle_id = 4.6;  // knuckle inner diameter (pin + 0.3 clearance per side overall 0.6? spec says +0.3)
pin_d = 4;         // pin diameter
pin_len = 32;      // pin length (1mm overhang each side)
seg = 6;           // each knuckle segment length (30/5)

// Screw hole parameters
screw_through_d = 3.2;
screw_csk_d = 6;
screw_csk_depth = 1;
screw_pitch = 8;

// ---------- Leaf with knuckles ----------
// The leaf's flat plate ends tangent to the knuckle (so the plate doesn't
// extend across the hinge axis). The knuckle is centered at x=0, and the
// plate's inner edge is at x = ±knuckle_od/2 (so that when opened 180°,
// both plates lie in the same Z plane and clear each other).
module leaf(side="left") {
    sign = (side=="left") ? -1 : 1;
    knuckle_segs = (side=="left") ? [0,2,4] : [1,3];
    
    // Plate inner edge is tangent to knuckle outer cylinder
    plate_inner = sign * knuckle_od/2;
    plate_outer = sign * leaf_w; // total leaf width measured from axis... 
    // Spec: leaf is 25mm wide. Interpreting "25mm" as plate width from
    // knuckle edge outward, but typical hinge "leaf width" includes the
    // knuckle. Here we keep flat plate part = leaf_w from axis tangent
    // (so the visible flat is 25 mm wide as seen in top view, excluding knuckle).
    
    difference() {
        union() {
            // Flat plate
            if (side=="left") {
                translate([-leaf_w - knuckle_od/2, 0, -leaf_t/2])
                    cube([leaf_w, leaf_h, leaf_t]);
            } else {
                translate([knuckle_od/2, 0, -leaf_t/2])
                    cube([leaf_w, leaf_h, leaf_t]);
            }
            
            // Knuckles
            for (i = knuckle_segs) {
                translate([0, i*seg, 0])
                    rotate([-90,0,0])
                        cylinder(d=knuckle_od, h=seg);
            }
            
            // Small fillet bridge from plate edge to knuckle (optional, small triangular block)
            // Connect plate flush to knuckle: thin bridge along Y for each knuckle of THIS leaf
            for (i = knuckle_segs) {
                translate([sign*knuckle_od/2 - (side=="left" ? 0 : 0), i*seg, -leaf_t/2])
                    if (side=="left")
                        translate([-0.01,0,0]) cube([0.02, seg, leaf_t]);
                    else
                        translate([-0.01,0,0]) cube([0.02, seg, leaf_t]);
            }
        }
        
        // Pin hole through knuckles
        translate([0, -1, 0])
            rotate([-90,0,0])
                cylinder(d=knuckle_id, h=leaf_h+2);
        
        // Screw holes - 3 holes along Y, centered, on the leaf
        hole_x = sign * (knuckle_od/2 + leaf_w - 5);  // 5mm from outer edge
        y_center = leaf_h/2;
        for (i = [-1,0,1]) {
            y = y_center + i*screw_pitch;
            // Through hole
            translate([hole_x, y, -leaf_t/2 - 0.1])
                cylinder(d=screw_through_d, h=leaf_t + 0.2);
            // Countersink (taper) on top surface (+Z side)
            translate([hole_x, y, leaf_t/2 - screw_csk_depth])
                cylinder(d1=screw_through_d, d2=screw_csk_d, h=screw_csk_depth + 0.01);
        }
    }
}

// ---------- Pin ----------
// Pin length 32mm, knuckle stack length 30mm, so 1mm overhang each side
module pin() {
    translate([0, -1, 0])
        rotate([-90,0,0])
            cylinder(d=pin_d, h=pin_len);
}

// ---------- Assembly (180° open) ----------
leaf(side="left");
leaf(side="right");
color("gold") pin();

// Small butt hinge - 180° open state
// Pin axis along Y, leaves on Z=0 plane (180° open)
// Left leaf: x<0, knuckles at segments 0,2,4 (outer + middle)
// Right leaf: x>0, knuckles at segments 1,3 (between)

$fn = 64;

// ---- Parameters ----
leaf_w_total = 25;   // total leaf width including knuckle radius
leaf_h       = 30;   // leaf height (along Y, hinge axis)
leaf_t       = 2;    // leaf thickness
knuckle_od   = 8;    // knuckle outer diameter
knuckle_id   = 4.6;  // knuckle inner diameter (pin 4 + 0.6 clearance)
pin_d        = 4;    // pin diameter
pin_len      = 32;   // pin length (1mm overhang each end)
seg          = 6;    // segment length (30 / 5)

// Flat plate width (excluding the part occupied by knuckle radius)
plate_w = leaf_w_total - knuckle_od/2;

// Screw hole parameters
screw_through_d = 3.2;
screw_csk_d     = 6;
screw_csk_depth = 1;
screw_pitch     = 8;

// ---------- Leaf with knuckles ----------
module leaf(side="left") {
    sign = (side=="left") ? -1 : 1;
    knuckle_segs = (side=="left") ? [0,2,4] : [1,3];

    difference() {
        union() {
            // Flat plate: inner edge tangent to knuckle outer cylinder
            if (side=="left") {
                translate([-knuckle_od/2 - plate_w, 0, -leaf_t/2])
                    cube([plate_w, leaf_h, leaf_t]);
            } else {
                translate([knuckle_od/2, 0, -leaf_t/2])
                    cube([plate_w, leaf_h, leaf_t]);
            }

            // Knuckles (cylinders) for this leaf
            for (i = knuckle_segs) {
                translate([0, i*seg, 0])
                    rotate([-90, 0, 0])
                        cylinder(d=knuckle_od, h=seg);
            }

            // Web connecting plate to knuckle (so plate flush-merges with knuckle wall)
            for (i = knuckle_segs) {
                if (side=="left")
                    translate([-knuckle_od/2, i*seg, -leaf_t/2])
                        cube([knuckle_od/2, seg, leaf_t]);
                else
                    translate([0, i*seg, -leaf_t/2])
                        cube([knuckle_od/2, seg, leaf_t]);
            }
        }

        // Pin hole through knuckles
        translate([0, -1, 0])
            rotate([-90, 0, 0])
                cylinder(d=knuckle_id, h=leaf_h + 2);

        // Screw holes (3 along Y), centered on the flat plate
        hole_x = sign * (knuckle_od/2 + plate_w/2);
        y_center = leaf_h/2;
        for (i = [-1, 0, 1]) {
            y = y_center + i*screw_pitch;
            // Through hole
            translate([hole_x, y, -leaf_t/2 - 0.1])
                cylinder(d=screw_through_d, h=leaf_t + 0.2);
            // Countersink on +Z (visible) face
            translate([hole_x, y, leaf_t/2 - screw_csk_depth])
                cylinder(d1=screw_through_d, d2=screw_csk_d,
                         h=screw_csk_depth + 0.01);
        }
    }
}

// ---------- Pin ----------
module pin() {
    translate([0, -1, 0])
        rotate([-90, 0, 0])
            cylinder(d=pin_d, h=pin_len);
}

// ---------- Assembly (180° open) ----------
color("steelblue")  leaf(side="left");
color("slategray")  leaf(side="right");
color("gold")       pin();

// Small butt hinge - 180° open state
// Pin axis along Y, leaves on Z=0 plane (180° open)
// Left leaf: x<0, knuckles at segments 0,2,4 (outer + middle)
// Right leaf: x>0, knuckles at segments 1,3 (between)

$fn = 64;

// ---- Parameters ----
leaf_w_total = 25;   // total leaf width including knuckle radius
leaf_h       = 30;   // leaf height (along Y, hinge axis)
leaf_t       = 2;    // leaf thickness
knuckle_od   = 8;    // knuckle outer diameter
knuckle_id   = 4.6;  // knuckle inner diameter (pin 4 + 0.6 clearance)
pin_d        = 4;    // pin diameter
pin_len      = 32;   // pin length (1mm overhang each end)
seg          = 6;    // segment length (30 / 5)

// Flat plate width (excluding the part occupied by knuckle radius)
plate_w = leaf_w_total - knuckle_od/2;

// Screw hole parameters
screw_through_d = 3.2;
screw_csk_d     = 6;
screw_csk_depth = 1;
screw_pitch     = 8;

// Pin overhang positioning: pin length 32mm, knuckles span 30mm => 1mm extra each side
pin_y_start = -1;

// ---------- Leaf with knuckles ----------
module leaf(side="left") {
    sign = (side=="left") ? -1 : 1;
    knuckle_segs = (side=="left") ? [0,2,4] : [1,3];

    difference() {
        union() {
            // Flat plate: inner edge tangent to knuckle outer cylinder
            if (side=="left") {
                translate([-knuckle_od/2 - plate_w, 0, -leaf_t/2])
                    cube([plate_w, leaf_h, leaf_t]);
            } else {
                translate([knuckle_od/2, 0, -leaf_t/2])
                    cube([plate_w, leaf_h, leaf_t]);
            }

            // Knuckles (cylinders) for this leaf
            for (i = knuckle_segs) {
                translate([0, i*seg, 0])
                    rotate([-90, 0, 0])
                        cylinder(d=knuckle_od, h=seg);
            }

            // Web connecting plate to knuckle (so plate flush-merges with knuckle wall)
            for (i = knuckle_segs) {
                if (side=="left")
                    translate([-knuckle_od/2, i*seg, -leaf_t/2])
                        cube([knuckle_od/2, seg, leaf_t]);
                else
                    translate([0, i*seg, -leaf_t/2])
                        cube([knuckle_od/2, seg, leaf_t]);
            }
        }

        // Pin hole through knuckles
        translate([0, -1, 0])
            rotate([-90, 0, 0])
                cylinder(d=knuckle_id, h=leaf_h + 2);

        // Screw holes (3 along Y), centered on the flat plate
        hole_x = sign * (knuckle_od/2 + plate_w/2);
        y_center = leaf_h/2;
        for (i = [-1, 0, 1]) {
            y = y_center + i*screw_pitch;
            // Through hole
            translate([hole_x, y, -leaf_t/2 - 0.1])
                cylinder(d=screw_through_d, h=leaf_t + 0.2);
            // Countersink on +Z (visible) face
            translate([hole_x, y, leaf_t/2 - screw_csk_depth])
                cylinder(d1=screw_through_d, d2=screw_csk_d,
                         h=screw_csk_depth + 0.01);
        }
    }
}

// ---------- Pin ----------
module pin() {
    translate([0, pin_y_start, 0])
        rotate([-90, 0, 0])
            cylinder(d=pin_d, h=pin_len);
}

// ---------- Assembly (180° open) ----------
color("steelblue")  leaf(side="left");
color("slategray")  leaf(side="right");
color("gold")       pin();