CMfgE case studies
CMfgE · Put your knowledge to work in context.
The Certified Manufacturing Engineer (CMfgE) is one of the professional credentials listed by SME under its Technical Certification track, alongside the Certified Manufacturing Associate (CMfgA) and Certified Manufacturing Technologist (CMfgT). SME describes its professional certifications as a way to validate knowledge against industry standards, boost career opportunities, and set yourself apart from peers. The CMfgE case studies are 5 cases and about 5,206 words.
1Turning 316L Valve Stems: Drift, Taper, and the Offset Trap
A 60-piece lot of 316L stainless valve stems is turned on a two-axis CNC lathe to Ø25.000/24.979 mm over a 210 mm gauge length. The process was qualified at Cpk 1.45.
1,063 words, about 5 min2Bracket Cell at 108% of Capacity: Choosing Between SMED, Batch Size, and Capital
A job shop machines a family of 6061 aluminum brackets through three steps: saw, CNC mill on two identical vertical machining centers, and manual deburr. Monthly demand just rose 25% to 9,400 good pieces and is expected to hold at that level.
1,017 words, about 5 min3LPBF Ti-6Al-4V Bracket: Lack-of-Fusion at the Downskin and an Overdue HIP Decision
An LPBF Ti-6Al-4V bracket weighs 320 g and is built two per plate at 40 µm layer thickness, 250 W laser power, 800 mm/s scan speed, 60 µm hatch, 90° stripe rotation, on the eighth powder reuse cycle. Build time is 28 hours.
1,092 words, about 5 min4Predictive Maintenance Pilot: 27% Precision and a Clock That Drifts Eight Minutes a Day
A plant installed condition monitoring on 3 of its 12 injection molding machines: 3-axis vibration at 25.6 kHz, hydraulic pressure as a proxy for screw torque at 1 Hz, and barrel heater current. Over six months those machines had 15 unplanned failures.
982 words, about 5 min5Die Casting Porosity After Refurbishment: Vacuum Seal, Thermal Balance, or Both?
A 1,250-ton high-pressure die casting cell runs a 2.1 kg AlSi9Cu3 transmission housing on a 62-second cycle. After a die refurbishment - new cavity inserts to the same drawing - X-ray rejection for internal porosity rose from 1.8% to 6.4%.
1,052 words, about 5 min