CNC Machinist & Operator

About The Opportunity

We build complex, precision components — and we do it right. That means the people running our machines aren't button-pushers. They're skilled machinists who take ownership of their work, hold themselves to a high standard, and care about what comes off the floor. We're looking for an experienced CNC Machinist who is ready to contribute across our full platform — vertical mills, 5-axis mills, turning centers, and mill-turn machines.

What You'll Do

• Setup and Machine Operation
• Set up, run, and break down CNC machining jobs across multiple platforms — loading fixturing, establishing datums, setting work offsets, building and qualifying tooling, and verifying readiness through first-piece validation before production begins.
• Operate using pre-proven programs on well-documented work and take increasing ownership of more complex setups as your experience and confidence grow.
• In-Process Quality and Inspection
• Monitor machine performance, tool wear, and part quality throughout production using hand metrology — calipers, micrometers, height gauges, and related instruments.
• Identify out-of-tolerance conditions, work through them with a structured mindset, and escalate when needed to keep quality intact.
• Troubleshooting and Process Improvement
• Work through issues related to tooling, workholding, machine performance, and material behavior — collecting data, collaborating with senior team members, and contributing your own observations to drive resolution.
• Apply a deeper understanding of machining principles to recommend improvements in tooling, fixturing, and workflow efficiency.
• Documentation and ERP
• Accurately complete all required production documentation and time tracking in ProShop ERP — including job time, status updates, and production notes — ensuring traceability and supporting downstream planning and quality functions.
• Training and Team Contribution
• Engage in structured training to build understanding of not just execution steps but the reasoning behind tooling, fixturing, and sequencing decisions.
• Share what you learn, reinforce best practices with teammates, and contribute to a culture where everyone is getting better.
• Shop Standards
• Deburr and clean components, maintain an organized workspace, uphold 5S standards, perform routine machine maintenance, and report equipment issues promptly.

Physical Requirements

• Stand, walk, and move throughout the facility for extended periods during machine operation, part handling, and shop support.
• Bend, stoop, kneel, and reach to load workpieces, access fixturing, and handle parts at machine level.
• Regularly lift and carry raw materials, finished parts, tooling, and fixturing; occasionally up to 50 lbs; team lifts required for heavier loads.
• Wear required PPE at all times on the shop floor — safety glasses, hearing protection, and steel-toed footwear.
• Use hand metrology instruments and precision tooling with manual dexterity; may perform repetitive hand and wrist motions.
• Read work instructions, setup documentation, and inspect machined surfaces with required visual acuity.
• Hold a valid driver's license for occasional logistics tasks.
• Overtime may be available and is occasionally required.
• Some non-standard hours, including early mornings or evenings on weekdays and weekends, may be needed.

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.

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.