Manufacturing Engineer - CNC Machining

About this role

SUMMARY

The Manufacturing Engineer is a key role within our Engineering department, responsible for the full lifecycle of CNC programming and process development across 2, 3, 4, and 5+ axis turning and milling machines. This role owns its work — from tooling selection and fixture design through prove-out, operator training, and continuous improvement — and is expected to deliver production-ready results with a high degree of accuracy and accountability.

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.

EXPERIENCE & SKILLS

You should be able to come in and:

- Read and interpret technical drawings and GD&T callouts and translate them directly into a machining strategy.

- Build a CNC program from scratch in Fusion 360, Hypermill, or a comparable CAM platform — and know why you made the toolpath choices you did.

- Select tooling, set speeds and feeds, and design a workholding approach appropriate for the part geometry and material.

- Prove out your own programs, catch your own errors, and reduce run time without sacrificing quality.

- Troubleshoot a dimensional miss — trace it back to root cause and fix it, not just compensate for it.

- Use calipers, micrometers, indicators, and other metrology tools accurately and routinely.

- Operate on Haas and/or Heidenhain controllers with confidence; familiarity with controller-level troubleshooting is a plus.

- Document a setup clearly enough that an operator can run it without you in the room.

- Manage several active jobs at once without losing track of quality or delivery commitments.

PHYSICAL REQUIREMENTS

- On-site, machine shop environment. Overtime and occasional non-standard hours may be required.

- Regular standing, walking, bending, stooping, and kneeling throughout the facility.

- Occasional lifting up to 50 lbs; team lifts required for heavier loads.

- PPE required on the shop floor at all times (safety glasses, hearing protection, steel-toed footwear).

- Manual dexterity and visual acuity required to read technical drawings, GD&T callouts, and operate precision measurement tools.

ABOUT RENNSCOT MFG

Rennscot MFG, founded in 2017, started as a motorsports-focused shop in the aftermarket automotive industry. Now, they are a leading provider of advanced manufacturing services located in Woburn, MA. Rennscot MFG strives to be more than just a machine shop; they solve problems in innovative ways, using a suite of integrated services to fuel a passion for ideation. With a focus on diversifying into commercial and critical technology sectors, Rennscot MFG delivers cutting-edge technologies and unwavering commitment to quality. They offer 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 http://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.