CNC Programmer​/Operator​/Machinist

Penta Cast Inc Business Location

Strathroy, Ontario

In Person

October 15, 2026 at 12:00am

The CNC Programmer / Operator / Machinist is responsible for programming, setting up, operating, and troubleshooting CNC machining equipment used to produce precision-machined components. The position works from engineering drawings, specifications, CAD/CAM data and production requirements to ensure parts meet dimensional, quality and production standards.

• Program, set up and operate CNC mills, lathes and other CNC machining equipment.
• Develop, test and optimize CNC programs for new and existing cast components.
• Read and interpret engineering drawings, blueprints, GD&T and machining specifications.
• Determine appropriate tooling, work-holding, cutting tools, speeds, feeds and machining processes.
• Set machine offsets, tool lengths, work coordinates and cutting parameters.
• Perform machine setups, including fixtures, tooling, work-holding and first-piece production.
• Prove out new CNC programs and adjust to ensure safe and accurate operation.
• Modify existing programs to accommodate casting variations, engineering changes, tooling changes and production improvements.
• Troubleshoot machine problems including dimensional variation, tool wear, chatter, surface finish and machine/program issues.
• Perform in-process and final inspection using calipers, micrometers, gauges, indicators, bore gauges and other precision measuring equipment.
• Verify first-off parts and ensure production remains within specified tolerances.
• Identify quality issues and make appropriate machine/program adjustments.
• Deburr, clean and finish machined components as required.
• Maintain accurate production, inspection and quality records.
• Work closely with Quality, Engineering, Maintenance and Production to resolve manufacturing issues.
• Assist with initiatives focused on productivity, scrap reduction, cycle-time improvements and machining efficiency.
• Perform routine machine maintenance and tooling changes.

• Create CNC programs from engineering drawings and models.
• Utilize CAD/CAM software to generate and optimize tool paths.
• Edit G-code and machine-control programs as required.
• Select appropriate machining strategies based on material, casting geometry, tolerances and production volume.
• Optimize programs for cycle time, tool life, quality and repeatability.
• Transfer and maintain CNC programs for multiple machines.
• Document program revisions and maintain appropriate program-control procedures.

• Conduct first-piece, in-process and final inspections.
• Use precision measurement equipment including:
  • Calipers
  • Micrometers
  • Height gauges
  • Dial indicators
  • Bore gauges
  • Pin gauges
  • Thread gauges
  • Other specialized inspection equipment
• Interpret dimensional requirements and tolerances.
• Identify and report non-conforming material.
• Work with the Quality Department to investigate root causes and implement corrective actions.
• Support SPC and other quality-control activities where required.

Post Secondary Education

Experience Required

• Completion of a CNC Machining, General Machinist or equivalent technical program
• CNC machining experience in a manufacturing environment.
• Strong CNC programming and machine setup experience.
• Experience with CNC mills and/or lathes.
• Strong ability to read and interpret engineering drawings.
• Knowledge of GD&T, machining tolerances, cutting tools, speeds and feeds.
• Experience with CAD/CAM programming is an asset.
• Experience with CNC controls such as Fanuc, Haas or similar is an asset.
• Strong knowledge of precision measurement and inspection techniques.
• Experience machining aluminum, zinc or other cast components
• Strong mechanical aptitude and troubleshooting ability.
• Ability to work independently with minimal supervision.
• Strong attention to detail and commitment to quality.
• Good communication and teamwork skills.

• Work in an environment with exposure to noise, metalworking equipment and industrial conditions
• Stand for extended periods
• Lift and handle tooling, fixtures and components
• Be comfortable working around CNC machinery and other industrial equipment
• Must comply with Utilize required PPE and workplace safety procedures.