Job Description

Class A Mold Maker

Position Summary

The Class A Mold Maker is a top-tier, highly skilled tooling professional responsible for building, fitting, modifying, and repairing complex molds to the highest precision standards. This role requires expert-level machining capability, strong understanding of mold design, and the ability to work independently from concept through completion.

Key Responsibilities

• Build new molds from start to finish , including machining, fitting, assembly, polishing, and final qualification.
• Interpret highly detailed engineering drawings, 3D CAD models, and GD&T specifications with minimal supervision.
• Set up and operate advanced machining equipment , including CNC mills/lathes, surface grinders, EDM (sinker and wire), and high-precision manual equipment.
• Perform complex mold repairs and engineering changes , including troubleshooting parting line issues, venting, gating, runners, slides, lifters, and hot-runner systems.
• Diagnose root causes of mold defects (flash, galling, cooling issues, alignment failures, etc.) and implement corrective actions.
• Lead mold trials , ensuring tools run correctly and meet all dimensional, cosmetic, and functional requirements before release to production.
• Collaborate with design, engineering, and processing teams to optimize mold design for manufacturability, quality, and cycle time.
• Maintain detailed documentation and mold history , including preventive maintenance actions and repair logs.
• Ensure all work complies with tight tolerances , quality standards, and safety procedures.

Qualifications

• Journeyman toolmaker certification or equivalent high-level training required.
• 5-10+ years of mold-making experience , preferably with complex, high-precision molds.
• Expert understanding of:



• Mold design and mold construction
• Tool steels, heat treating, and material properties
• Hot runner systems, cooling layouts, gating strategies
• Tight-tolerance machining and finishing practices





• Ability to independently program, set up, and operate CNC equipment and EDM systems .
• High proficiency with precision measuring tools (micrometers, indicators, gauge blocks, optical comparators).
• Strong analytical and troubleshooting skills.
• Ability to lead projects, mentor junior mold makers, and coordinate work with engineering.

Preferred Skills

• Experience with medical injection molds .
• Familiarity with CAD/CAM software such as SolidWorks, Mastercam, or Siemens NX.
• Knowledge of lean manufacturing and continuous improvement practices.
• Experience supporting high-volume manufacturing environments

Work Environment

• Precision toolroom within a manufacturing facility.
• Requires standing, lifting up to 50 lbs, and working with machinery, oils, coolants, and fine-detail components.
• Overtime may be required based on production needs.

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