Overview

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 TOLERANCING SYMBOLOGY including(a) geometric characteristic symbols(1) straightness(2) flatness(3) circularity(4) cylindricity(5) profile of line(6) profile of surface(7) angularity(8) perpendicularity(9) parallelism(10) position(11) concentricity(12) symmetry(13) circular runout(14) total runout(b) datum feature symbol(1) datum identifying letters(2) method of relating symbol frame to datumfeature(c) datum target symbol(1) indicating size of target area(2) indicating targets on hidden side of view(d) basic dimension symbols(e) material condition symbols(1) maximum material condition(2) least material condition(3) restrictions on use of symbols(f) projected tolerance zone symbol: use andrestrictions(g) diameter and radius(h) reference symbol(i) arc length symbol(j) statistical tolerance symbol(k) between symbol(l) counterbore or spotface symbol(m) countersink symbol(n) depth symbol(o) square symbol(p) dimension origin symbol(q) taper and slope symbol(r) all-around symbol(s) free state symbol(t) tangent plane symbol(u) geometric tolerance symbols(1) feature control frame(2) feature control frame incorporating one datumreference(3) composite feature control frame(4) two single-segment feature control frames(5) combined feature control frame and datumfeature symbol(6) feature control frame with a projected tolerancezone(v) tolerance zone identification

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