Manufacturing Engineer - CNC Machining

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 .

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.