Plastic Injection Mold Toolmaker

About the role

We are seeking a highly skilled Plastic Injection Mold Toolmaker to build, troubleshoot, repair, and maintain complex plastic injection molds within a precision manufacturing and moldmaking environment. The ideal candidate will bring strong hands-on toolroom experience, a deep understanding of mold construction and injection molding processes, and the ability to consistently produce work to exacting quality standards.

Responsibilities

• Disassemble, inspect, troubleshoot, repair, modify, and reassemble complex plastic injection molds, including multi-component molds, cavities, cores, slides, lifters, ejector systems, and other mold mechanisms.
• Diagnose molding and tooling issues, identify root causes of defects or mechanical failures, and recommend or implement appropriate repairs and improvements.
• Perform mold fitting, spotting, polishing, alignment, adjustment, and bench work to ensure proper operation, part quality, and repeatable production performance.
• Build, modify, and repair mold components according to blueprints, engineering drawings, work orders, samples, and established tooling standards.
• Operate manual toolroom equipment, including surface grinders, Bridgeport-style milling machines, drill presses, saws, polishing equipment, and other conventional machining equipment.
• Perform precision grinding, milling, fitting, and hand-finishing operations while maintaining tight tolerances, including tolerances as close as ±0.0002 inch.
• Read and interpret blueprints, engineering drawings, CAD-based documentation, GD&T, work orders, and mold-component specifications.
• Understand tolerance stack-up and evaluate how component dimensions, clearances, fits, and alignment affect mold performance and finished-part quality.
• Inspect mold components and completed work using dial indicators, micrometers, depth gauges, gauge blocks, calipers, height gauges, pin gauges, and optical comparators/shadowgraphs.
• Document repairs, maintenance activities, dimensional results, and tooling modifications in accordance with internal quality and maintenance procedures.
• Collaborate with engineering, molding, quality, machining, and production teams to resolve mold-performance issues and support process improvements.
• Maintain organized toolroom practices and follow all safety, quality, and preventative-maintenance procedures.

Qualifications

• Minimum of five years of hands-on experience as a moldmaker, toolmaker, mold repair technician, or similar professional in a plastic injection molding or precision tooling environment.
• Strong working knowledge of plastic injection mold design, construction, components, mechanisms, and molding-process fundamentals.
• Demonstrated ability to independently troubleshoot, repair, and rebuild complex plastic injection molds.
• Proficiency operating manual toolroom machinery, particularly manual surface grinders and Bridgeport-style vertical milling machines.
• Ability to consistently work to close tolerances, including ±0.0002 inch, with a thorough understanding of tolerance stack-up, fits, and clearances.
• Proficient in reading and interpreting complex blueprints, engineering drawings, work orders, and GD&T requirements.
• Experience using precision inspection tools, including indicators, micrometers, calipers, depth gauges, gauge blocks, and shadowgraphs/optical comparators.
• Experience with CNC milling, wire EDM, and/or sinker EDM is preferred.
• Strong mechanical aptitude, troubleshooting ability, attention to detail, and commitment to high-quality workmanship.
• Ability to work independently, prioritize repairs and build work effectively, and collaborate with cross-functional manufacturing teams.