ASME GDTP Senior Level case studies
ASME GDTP Senior Level · Put your knowledge to work in context.
The ASME GDTP Senior Level certification is a professional credential that recognizes advanced competence in Geometric Dimensioning and Tolerancing as defined by ASME Y14.5. It is intended for experienced designers, product definition engineers, manufacturing and quality engineers, inspectors, and GD&T trainers who must interpret and apply GD&T across complex drawings and inspection scenarios, and who are often the person others consult when a callout is ambiguous. The ASME GDTP Senior Level case studies are 5 cases and about 2,706 words.
1Position Callout on a Rotated Flange Pattern with Only Two Datums Referenced
A machinist produces a circular flange with six Ø8.0-8.4 holes equally spaced on a Ø120 bolt circle. The drawing shows a position callout: ⌖ Ø0.4(M) A B where A is the flange face and B is the Ø50 pilot bore.
470 words, about 2 min2Bonus Tolerance Interaction Between Position at MMC and a Datum Feature at MMC
A bracket has a Ø10.0-10.2 hole controlled by ⌖ Ø0.3(M) A B(M) , where B is a Ø30.0-30.2 boss that serves as the secondary datum feature. The produced hole measures Ø10.18 and the produced boss measures Ø30.06.
606 words, about 3 min3Profile of a Surface Controlling Both Location and Size of a Slot - and the Effect on a Position Callout
- specifically ⌖ 2.0 A B C applied to the slot surfaces, where the slot width is given as a basic dimension. In addition, a position callout ⌖ Ø0.2 A B C is applied to the slot's center plane.
521 words, about 3 min4Composite Position vs. Two Single-Segment Position for a Clearance Hole Pattern
A cover plate has four Ø6.6-6.8 clearance holes for M6 bolts, with a pattern located by ⌖ Ø0.8(M) A B C and a second segment ⌖ Ø0.3(M) A applied as a composite feature control frame (single frame, two segments). Datum A is the plate face; B and C locate the pattern.
552 words, about 3 min5Runout vs. Profile for a Thin-Wall Cylinder - and Whether Total Runout Detects Taper
total runout 0.05 A where A is the Ø80 bore. The part is machined in a single setup, then heat-treated, causing the bore to become slightly out-of-round (0.03 mm) and the OD to taper from Ø80.00 at one end to Ø79.94 at the other.
557 words, about 3 min