CNC Programmer (Mazak)

About the role

Cummins is a global manufacturer of industrial diesel and natural-gas engines, and its Darlington plant is one of the company's primary UK engineering sites. The facility produces high-horsepower engines that power heavy trucks, construction equipment, marine vessels, power-generation sets and rail traction units across the UK, Europe and beyond. The machining team operates a fleet of Mazak Integrex multi-tasking centres — 5-axis turn-mill machines that complete complex engine components in a single setup. This role is programming-focused: writing, proving and optimising Mazatrol and ISO programs for components like cylinder heads, engine blocks and crankshafts, working closely with the shop-floor operators who run the parts. Engineering culture at Cummins is strong and progression paths are well-defined. Senior programmers typically move into NPI engineering, methods leadership or process technology over a career. Programmers work directly with toolroom, inspection and methods to optimise both cycle time and tooling spend across the engine families produced on site. Standard package: defined-contribution pension matched up to 7%, annual bonus tied to plant performance, life assurance, employee share purchase plan, and a strong CPD budget for advanced manufacturing courses and conferences.

Responsibilities

• Write, prove and optimise Mazatrol and ISO programs for Mazak Integrex multi-tasking centres
• Select tooling, fixtures and workholding for new and modified engine components
• Run first-off proving cycles on the shop floor with the operating team
• Optimise cycle times and tool life across high-volume runs without sacrificing component quality
• Liaise with methods, inspection and toolroom on engineering change introductions
• Maintain the CADCAM library (Edgecam, GibbsCAM or equivalent) with proper version control
• Support continuous improvement projects targeting machine OEE and tooling cost per part

Requirements

• 5+ years CNC programming experience on Mazak Integrex or equivalent multi-tasking platform
• Fluent in BOTH Mazatrol and ISO G-code programming
• GD&T literacy and confident reading complex engineering drawings
• CADCAM proficiency — Edgecam, GibbsCAM, Mastercam or NX-CAM
• Practical knowledge of cutting tools, inserts and modern strategies (high-feed, trochoidal, dynamic milling)
• Comfortable presenting cycle-time and process changes to engineering management