Manufacturing Engineer - CNC Machining

Responsibilities

• Develop manufacturing processes including tooling and raw material selection, fixture design, and CNC programming in Fusion 360 and/or Hypermill across 2, 3, 4, and 5+ axis turning and milling machines.
• Write CNC programs including advanced techniques such as macro programming, Q variable programming, and in-process probing.
• Conduct post-program prove-out for error checking and run time reduction.
• Identify root causes of dimensional errors, rework, and inefficiency; lead and implement corrective actions.
• Design quality, safety, and dimensional integrity controls into new technical work.
• Produce and maintain setup documentation in ProShop ERP including tooling lists, work-holding instructions, program references, and run notes.
• Manage multiple concurrent components and projects to meet quality and lead-time requirements.
• Troubleshoot geometric errors in multi-axis machinery to resolve dimensional issues.
• Train machine operators on developed processes — covering machine operation, tooling use, and the reasoning behind each step.
• Mentor CNC programmers and operators; share best practices and support team development.
• Support process standardization and departmental improvement efforts.
• Support other projects and assignments as needed.

Requirements

• Spent meaningful time on the shop floor running and programming multi-axis CNC machines — not just observing, but owning setups, solving problems, and producing parts that meet tight tolerances.
• Ability to read and interpret technical drawings and GD&T callouts and translate them directly into a machining strategy.
• Experience building CNC programs from scratch in Fusion 360, Hypermill, or a comparable CAM platform — and knowledge of toolpath choices.
• Experience selecting tooling, setting speeds and feeds, and designing workholding approaches appropriate for part geometry and material.
• Experience proving out CNC programs, catching errors, and reducing run time without compromising quality.
• Experience troubleshooting dimensional issues, tracing them to root cause, and implementing fixes.
• Experience operating on Haas and/or Heidenhain controllers with confidence; familiarity with controller-level troubleshooting is a plus.
• Experience documenting setups clearly enough that an operator can run them without supervision.
• Experience managing multiple active jobs simultaneously while maintaining quality and meeting delivery commitments.

About Rennscot MFG

Rennscot MFG, founded in 2017, is a leading provider of advanced manufacturing services located in Woburn, MA. Founded as a motorsports-focused shop in the aftermarket automotive industry, Rennscot MFG now offers a comprehensive range of services, including reverse engineering, metal & polymer additive manufacturing, and precision machining to support various industries' needs. For more information, visit rennscotmfg.com.

ITAR Requirement

To conform to US Government export regulations, including the International Traffic in Arms Regulations (ITAR), you must be a US citizen, lawful permanent resident of the US, protected individual as defined by 8 U.S.C. 1324b(a)(3), or eligible to obtain the required authorizations from the US Department of State. Learn more about the ITAR here: https://www.pmddtc.state.gov/ddtc_public/ddtc_public?id=ddtc_public_portal_itar_landing.

EEO Statement

Rennscot MFG is an Equal Opportunity Employer; employment with Rennscot MFG is governed on the basis of merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status. It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.