mechanics-dat/CAD-dat/assembly-dat/assembly-dat.md
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-
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-# assembly-dat
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-
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-fastened
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-revolute
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-slider mate
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-
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-planar mate
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-
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-Allow translation along the X and Y axes, and rotation about the Z axis.
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-
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-The lst selection serves as the movement point, and the 2nd as the stationary point.
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-
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-
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-Cylindrical mate
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-Pin slot mate
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-Ball mate
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-Parallel mate
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-
mechanics-dat/mechanical-parts-dat/screw-dat/screw-Self-tapping-dat/screw-Self-tapping-dat.md
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+# screw-Self-tapping-dat
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+
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+- easy for two layer assembly
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+
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+- works for [[plastic-dat]] [[wood-dat]]
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+
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+3. 工程语境中的常用表达
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+Pre-drilled hole: 预钻孔（自攻螺钉通常需要一个比螺纹略小的引导孔）。
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+
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+Pilot hole: 引导孔。
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+
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+Thread pitch: 螺距。
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+
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+Course thread: 粗牙螺纹（塑料件常用）。
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product-dat/assembly-dat/2026-02-13-19-13-26.png
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product-dat/assembly-dat/asm-plastic-Snap-fit-dat/asm-plastic-Snap-fit-dat.md
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+# asm-plastic-Snap-fit-dat
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+
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+2. 三种最常见的卡扣类型 (Common Types of Snap-fits)
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+
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+在编写设计文档或与工程师沟通时，通常会具体到某种结构：
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+Cantilever Snap-fit: 悬臂式卡扣（最常见，形如长条，末端带钩）。
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+
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+Annular Snap-fit: 环形卡扣（常见于笔盖、瓶盖，圆形周向扣合）。
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+Torsion Snap-fit: 扭力式卡扣（通过扭转力臂实现扣合，较少见）。
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product-dat/assembly-dat/assembly-dat.md
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+# assembly-dat
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+
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+
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+
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+## assembly-real
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+
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+
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+- [[plastic-dat]]
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+
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+- [[asm-plastic-Snap-fit-dat]] - [[plastic-dat]]
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+
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+- [[screw-Self-tapping-dat]] - [[plastic-dat]] - [[screw-dat]]
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+
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+
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+long through thread
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+
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+![](2026-02-13-19-13-26.png)
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+
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+
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+
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+
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+## assembly-CAD
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+
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+fastened
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+revolute
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+slider mate
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+
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+planar mate
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+
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+Allow translation along the X and Y axes, and rotation about the Z axis.
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+
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+The lst selection serves as the movement point, and the 2nd as the stationary point.
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+
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+
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+Cylindrical mate
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+Pin slot mate
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+Ball mate
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+Parallel mate
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+
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+## ref
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+
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+- [[product-dat]]
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product-dat/product-dat.md
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+
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+# product-dat
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+
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+
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+- [[PCB-dat]]
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+
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+- [[mechanics-dat]]
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+
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+
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+- [[assembly-dat]]
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+
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+
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+- [[cad-dat]]
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+
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+
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+
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+
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+## ref
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+
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+