Sergio Martinez-Villegas
Tool Maker B
Schiller Park,IL
Summary
Detail-oriented and highly skilled manufacturing professional with 8 years of hands-on experience in a tool room environment. Proficient in a wide range of manual and CNC machinery, including manual mills, lathes, surface grinders, cylindrical grinders, universal tool and cutter grinders, 3-axis CNC mills, and 2-axis CNC lathes. Experienced in holding tight tolerances with total tolerances as small as 0.0001". Currently pursuing an Associate Degree in Manufacturing Technology at the College of DuPage, combining academic advancement with real-world expertise. Recognized for precision, efficiency, and a strong commitment to quality in fast-paced, high-standards production environments.
Overview
8
8
years of professional experience
3
3
Certifications
Work History
Tool Maker
Sloan Valve Company
Franklin Park, IL
06.2022 - Current
- Plan, construct, alter, and repair a wide variety of tools, jigs, prototypes, special parts, and fixtures, involving difficult and complex machine operations, utilizing a wide variety of manual and CNC machine tools.
- Work from prints, sketches, computer-aided manufacturing software, machine manuals, machinist manuals, and instructions.
- Planned and laid out job assignments, determined the sequence of machining operations, calculated shrinkage and expansion allowances, and programmed operations as necessary.
- Perform machine operations requiring unusual and difficult setups, and methods to maintain very close tolerances and fits, including heat treating, drawing, tempering, and bench work involving filing, scraping, grinding, lapping, fitting, indexing, timing, assembly, and adjusting to ensure satisfactory operation.
- Perform tool troubleshooting duties as assigned.
- Make tool tryouts, diagnose and correct problems, and make recommendations on tool modifications and methods required.
- Report design errors, mark up changes on drawings, and refer to the Engineering Department.
- Use a variety of manual and CNC machine tools, precision measuring tools and instruments, video microscopes, optical comparators, heat-treating furnaces, and hand tools.
- Inspected final products for quality and functionality.
- Follow safety rules, and keep the work area in a clean and orderly condition.
Tool Grinder
Sloan Valve Company
Franklin Park, Illinois
02.2018 - 06.2023
- Braze materials and tools in preparation for grinding operations.
- Set up equipment to perform internal, external, surface, drill pointing, and other similar grinding operations on steel and carbide tools, dies, jigs, fixtures, cutters, circular and multiple form tools, gauges, shafts, spindles, or special items.
- Mount grinding wheels, set grind, rotation, spindle speeds, feed rates, angle of wheel, length of cycle, and depth of cut.
- Measure the workpiece to determine the amount of material to be removed, and position it on the table, face plate, or magnetic chuck in the fixture or chuck jaws, between the cutters and wheels.
- Make adjustments in order to ensure proper operations.
- Perform secondary operations to obtain high finish requirements.
- Provide assistance, guidance, and support to other personnel.
- Assessed finished pieces for compliance with standards, and removed defective items.
- Manually set up machinery, lathes, and grinders.
- Adaptable and proficient in learning new concepts quickly and efficiently.
- Used critical thinking to break down problems, evaluate solutions, and make decisions.
- Assisted with day-to-day operations, working efficiently and productively with all team members.
- Kept equipment in good working order by calibrating settings, and performing minor maintenance.
Education
High School Diploma -
East Leyden High School
Franklin Park, IL 05.2001 -
Associate of Applied Science - Manufacturing Technology
College of DuPage
Glen Ellyn, IL 05.2001 -
Skills
Precision Grinding: OD/ID Grinding, Surface Grinding, Tool and Cutter Grinding
Manual Machining: Bridgeport Mills, Hardinge Lathes, Engine Lathes (American Pacemaker)
CNC Machining: Setup, programming, and operation of 3-axis CNC mills (EZ-TRAK, ProtoTRAK), 2-axis CNC lathes (EZ-PATH), and CNC grinding (Walter Grinder)
Metrology & Inspection: Proficient in micrometers (OD/ID/depth/pitch), calipers, dial and test indicators, surface plates, gauge blocks, gauge pins, and surface gauges
GD&T (Geometric Dimensioning & Tolerancing): Skilled in reading, inspecting, and machining to GD&T specifications; experienced with feature control frames, datums, and tolerance zones
Precision Machining: Skilled in machining parts to tight tolerances ranging from 00001" to 00005" total tolerance, ensuring exceptional accuracy and quality finishes
Software Skills
- Proficient in SolidWorks for 3D modeling and technical drawing interpretation
Certification
OSHA 10-Hour General Industry (Manufacturing) Course
Timeline
CNC Job Readiness Certificate
09-2025
Manufacturing Skills Standards Certificate
09-2025
OSHA 10-Hour General Industry (Manufacturing) Course
05-2025
Tool Maker
Sloan Valve Company
06.2022 - Current
Tool Grinder
Sloan Valve Company
02.2018 - 06.2023
High School Diploma -
East Leyden High School
05.2001 -
Associate of Applied Science - Manufacturing Technology
College of DuPage
05.2001 -
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