Birgus latro · 可動標本結構設計Posable specimen design

椰子蟹可動標本設計圖Posable Coconut Crab Specimen

以真殼為模具，在每一節內部做補強內襯與配重芯，節與節之間用預埋金屬關節串接。殼本身不鑽孔，所有結構都從天然關節膜的開口進出。Each real shell segment serves as its own mould: a reinforcing liner and a weighted core are built inside it, and segments are linked by embedded metal joints. The shell is never drilled; everything goes in and out through the natural joint-membrane openings.

個體Specimen 成體雄蟹約 1.5 kgadult male, ~1.5 kg 頭胸甲Carapace 長 128 × 寬 129 mm128 × 129 mm 左螯掌節＋指Major chela 94 mm 站姿腳尖距Standing foot span 約 35 cm~35 cm 格線Grid 5 cm
載入 3D 模型中…Loading 3D model…
拖曳旋轉 · 雙指縮放 · 點部件看做法Drag to rotate · pinch to zoom · tap a part
點選任一部件，查看內部做法Tap any part to see how it is built inside

檢視模式View

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剖面圖・隨點選的部件變更Section · follows the selected part

    部件清單Parts schedule

    沿天然關節分件。越靠近身體的部件配重越重、關節越大；末端只做內襯，避免腳尖過重擺不住。Parts split at the natural joints. The closer to the body, the heavier the fill and the larger the joint; leg tips get a liner only, so they never become too heavy to hold a pose.

    組件Assembly數量Qty每支節數Segments填充Fill關節Joints
    身體核心（頭胸甲＋腹面胸甲）Body core (carapace + sternum)1—玻纖布＋加重補土內襯＋環氧鋼珠灌實，最重Fibreglass, weighted putty liner, epoxy + steel shot; heaviest partL各腳安裝座leg sockets
    大螯（左大右小）Chelipeds (left larger)26全部配重Fully weightedL×4 M×1 （可動指）(movable finger)
    步足（第 2–4 對）Walking legs (pairs 2–4)66基部兩節重、中段中、末端兩節只做內襯Heavy at the base, medium mid-leg, liner only on the last twoL×2 M×2 S×1
    第五對步足Fifth legs2—人造替換件ReplicaMAG
    腹部Abdomen1—軟腹翻模，樹脂複製品Soft abdomen moulded, cast in resinM可收折folds
    觸角、眼柄、口器Antennae, eyestalks, mouthparts6—人造替換件，原件另外保存Replicas; originals archivedMAG

    L M3–M4 肩螺絲＋碟形墊片；M Ø1.5–2 mm 黃銅軸或 M1.6–M2 螺絲＋矽膠墊片；S Ø0.8–1 mm 黃銅線緊配合；MAG 小型釹磁鐵卡榫，方便拆換。L M3–M4 shoulder screw + disc springs; M Ø1.5–2 mm brass pin or M1.6–M2 screw + silicone washer; S Ø0.8–1 mm brass wire, interference fit; MAG small neodymium magnet mount for easy swapping.

    製作順序Build order

    1. 拍照編號後分件Photograph, label, separate每節標左右與順序（如 L2-3），沿關節膜切開，殼不動。Tag every segment by side and order (e.g. L2-3); cut only through joint membranes.
    2. 清潔與徹底乾燥Clean and dry fully灌實後無法回頭，殘留組織會發臭發霉。Once filled there is no going back; leftover tissue will rot or mould.
    3. 做內襯Build the liner頭胸甲先貼玻纖布；各節壓貼混鐵粉的 AB 補土。Fibreglass inside the carapace; iron-filled epoxy putty pressed into each segment.
    4. 試裝關節件Dry-fit joint hardware先定位、測活動範圍，確認轉軸對準天然支點。Position it, test the range of motion, align pivots with the natural pivot points.
    5. 灌注配重芯Pour the weighted core慢乾型灌注樹脂分層灌，包死關節件根部。Slow-cure casting epoxy in layers, locking in the hardware.
    6. 組成次組件Sub-assemblies每支腳、每支螯各自串好，調整摩擦力。Join each leg and claw on its own and tune joint friction.
    7. 總組裝Final assembly身體 → 步足 → 大螯 → 腹部 → 替換件。Body → legs → claws → abdomen → replicas.
    8. 假關節膜與補色Membranes and paint矽膠覆蓋螺絲，壓克力補色，上保護漆。Silicone over the screws, acrylic touch-up, protective varnish.

    比例依據Where the proportions come from

    3D 模型的尺寸以 1.5 kg 雄蟹推算，不是憑印象畫的。實體量測後應以你那隻的數字為準。Model dimensions are derived for a 1.5 kg male from published measurements, not drawn by eye. Once the real specimen is measured, its numbers take priority.

    項目Item數值Value依據Basis
    胸甲長 TLThoracic length (TL)57 mm雄蟹體重回歸式 W = 0.022·TL2.749 代入 1,500 gMale regression W = 0.022·TL2.749 at 1,500 g
    頭胸甲長／頭甲長／胸甲寬Carapace / cephalic shield length, thoracic width128 / 71 / 129 mm同族群平均值依 TL 等比例縮放Population means scaled by TL
    螯：掌節＋指、掌寬、可動指、長節Chela: propodus, palm width, dactyl, merus左 94／55／54／62 mm
    右 71／42／43／60 mm    L 94 / 55 / 54 / 62 mm
    R 71 / 42 / 43 / 60 mm    		雄蟹螯部異速生長式Male cheliped allometry equations
    第 2–4 對足各節Legs 2–4, each segment見點選資訊see part details雄蟹各節平均長度比例，以螯長節換算Male segment-length ratios, scaled via cheliped merus
    基節、底坐節、第五對足、腹部Coxa, basis-ischium, leg 5, abdomen估計值estimated文獻未量測，依形態描述估算Not measured in the papers; estimated from descriptions

    資料來源：Sources: Anagnostou & Schubart 2014, Raffles Bulletin of Zoology · AACL Bioflux 11(5), 2018 · Coenobita Species: Birgus latro