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Percival Crowther-Mensah

CNC Machinist
Rockford, IL, United States

Professional Summary

Precision CNC Machinist with 7+ years programming and operating multi-axis mills and lathes for aerospace and heavy-equipment OEMs in northern Illinois. Skilled in Mastercam, Fanuc/Siemens controls, tight-tolerance setups (±0.0005"), and first-article inspection. Known for cutting scrap, shortening cycle times, and mentoring apprentices on shop-floor best practices.

Employment History

Senior CNC Machinist
PrecisionForge Manufacturing · Rockford, IL
Mar, 2021 · Present
Program and run 3- and 5-axis CNC mills (Haas VF-4, DMG MORI) for aerospace aluminum and stainless assemblies with GD&T callouts to ±0.0005". Cut average cycle time 18% on a high-volume hydraulic-manifold family by optimizing toolpaths and workholding in Mastercam. Own first-article and in-process inspection with Mitutoyo CMM and optical comparator; hold scrap under 0.8% on assigned cells for 4 consecutive quarters. Train 3 apprentices on setup sheets, probe routines, and lockout/tagout; two promoted to full machinist within 14 months.
CNC Machinist
Rock River Machine Works · Rockford, IL
Jun, 2017 · Feb, 2021
Operated Fanuc-controlled lathes and vertical mills for agricultural and construction OEM parts in steel, cast iron, and UHMW. Built and documented 40+ setup sheets that reduced changeover from ~55 to ~30 minutes on repeat jobs. Partnered with quality to resolve recurring dimensional drift on a shaft line; root cause was thermal growth—added warm-up and probe cycles. Maintained tooling inventory and recommended insert grades that extended tool life ~25% on interrupted cuts.
CNC Operator / Apprentice
Midwest Tool & Die · Belvidere, IL
Aug, 2014 · May, 2017
Loaded programs, set offsets, and ran production lots under journeyman supervision on Haas and Okuma equipment. Performed daily preventive maintenance and coolant checks; logged downtime so maintenance could prioritize spindle issues. Earned NIMS Level I Machining credentials while completing apprenticeship coursework at Rock Valley College.

Education

Associate of Applied Science, Precision Machining Technology
Rock Valley College · Rockford, IL
Aug, 2014 · May, 2016
NIMS Machining Level I credentials: Measurement, Materials & Safety; Job Planning, Benchwork & Layout; CNC Milling Operations. Completed alongside apprenticeship at Midwest Tool & Die.

Skills

Courses

NIMS Machining Level I
National Institute for Metalworking Skills
Measurement, Materials & Safety; Job Planning, Benchwork & Layout; CNC Milling Operations.
OSHA 10-Hour General Industry
OSHA Outreach Training Program
General industry hazard recognition, machine guarding, and lockout/tagout.
Forklift Operator Certification (current)
Employer-sponsored OSHA 1910.178 training
Powered industrial truck operation and daily inspection.