ASME GDTP Technologist case studies
ASME GDTP Technologist · Put your knowledge to work in context.
The GDTP Professional Certification is an ASME personnel credential that recognizes demonstrated understanding of geometric dimensioning and tolerancing (GD&T) principles as defined in the Y14.5 standard. ASME describes the program as one of its personnel certifications, alongside the QRO program, and its site notes that GDTP-2018 certification exams are open for registration. The ASME GDTP Technologist case studies are 5 cases and about 4,145 words.
1Bonus Tolerance on an Out-of-Round Hole
A machined aluminum housing carries a Ø10.00 ±0.10 through hole located by position Ø0.30 Ⓜ to A B C. The hole is drilled and reamed in one pass.
745 words, about 4 min2Which Datum Should Be Primary, and How Much Shift Is Legal?
A cast aluminum cover is bolted to a gearbox with four M8 screws through a machined flange. The drawing locates the four clearance holes with position Ø0.4 Ⓜ to A B C, where A is the 180 × 120 mm machined flange face, B is a Ø10.00/10.05 dowel hole, and C is a second Ø10.00/10.05 dowel hole 120 mm from B.
918 words, about 5 min3Flatness, Parallelism, and a Rocking Plate
A 300 × 200 × 12 mm ground steel plate has its top face controlled by flatness 0.02 plus parallelism 0.05 to datum A, the bottom face. The grinder produces parts that pass at the CMM: flatness 0.018, parallelism 0.041.
788 words, about 4 min4Pressed Pin, Bonus, and Whether a Gauge Is Even Legal
A Ø12.00/11.96 steel dowel is pressed into a plate whose mounting face is datum A. The drawing requires perpendicularity Ø0.08 Ⓜ to A on the pin.
786 words, about 4 min5Composite Profile: Passing the Upper Segment and Failing the Lower
A die-cast gearbox cover has a curved sealing land that compresses a rubber gasket. The drawing uses a composite profile-of-a-surface frame: the upper segment is 0.8 to A B C and the lower segment is 0.3 to A.
908 words, about 5 min