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课程名称：GDT Quiz Sec 2 一般公差及相关原则 Y14 概述：GDTP（几何尺寸和公差专业认证）是由美国机械工程师协会（ASME）提供的认证项目，旨在验证个人在理解和运用几何尺寸与公差（GD & T）原则方面的能力。GD & T 是制造中用于明确沟通的重要语言，确保设计按预期制造。ASME的Y14.5标准是GD & T的权威指南，GDTP认证基于1994年或2009年版本的此标准，包括附录及其原则与实践的应用。该认证项目提供两种认证级别：技术专家和高级专家。本部分内容基于ASME标准第2章，涵盖了一般公差及相关原则和以往实践，包括（a）公差的应用（b）公差表达（c）极限的解释（d）镀层和涂层零件（e）单极限（f）公差积累（g）尺寸的极限（h）特征之间的关系（i） RFS、MMC、LMC 的适用性（j）虚拟/结果条件（k）几何公差在齿轮和花键中的应用（l）螺纹（m）虚拟条件下的基准特征（n）角面（o）锥形锥度（p）平面锥度（q）半径（r）统计公差识别（s）以往实践（ASME Y14.5M-1994, 附录D）。
GDTP stands for Geometric Dimensioning and Tolerancing Professional. It is a certification program offered by the American Society of Mechanical Engineers (ASME) that verifies an individual's competence in understanding and applying the principles of Geometric Dimensioning and Tolerancing (GD & T). GD & T is an essential language used for clear communication in manufacturing, ensuring that designs are manufactured as intended. ASME's Y14.5 Standard serves as the authoritative guideline for GD & T, and GDTP certification is based on either the 1994 or 2009 revisions of this standard, including its appendices and the application of its principles and practices. The certification program offers two levels of certification: Technologist and Senior. This section is based on Chapter 2 of ASME STD. In this section, topics covered GENERAL TOLERANCING AND RELATED PRINCIPLES, AND FORMER PRACTICES including(a) application of tolerances (b) tolerance expression (c) interpretation of limits (d) plated and coated parts (e) single limits (f) tolerance accumulation (g) limits of size (h) relationship between features (i) applicability of RFS, MMC, LMC (j) virtual/resultant condition (k) geometric tolerance application to gears and splines (l) screw threads (m) datum features at virtual condition (n) angular surfaces (o) conical tapers,(p) flat tapers (q) radii (r) statistical tolerancing identification (s) former practices (ASME Y14.5M-1994, Appendix D)
