CNC Mill Operator

Mas-Precision-Parts; Vaughan; On-site; CAD 65,000 - 95,000; Full time

Job summary

MAS Precision Parts, a Woodbridge, Ontario-based job shop since 1989, specializes in tight-tolerance components across automotive, aerospace, and industrial markets. The position covers setup, first-article inspection, and running CNC milling jobs from prototypes to short production runs, with close collaboration to the owner-engineer and design team.

You will interpret drawings, perform tool setup, prove out new programs, document measurements, and maintain quality to drawing tolerances and

Qualifications

• 5+ years of experience setting up and operating CNC milling machines.
• Ability to set up a new job independently from workholding to offsets.
• Ability to interpret detailed drawings and GD&T.
• Solid understanding of speeds, feeds, and tooling selection.
• Experience machining aluminum, stainless steel, and tool steels.
• Familiarity with ISO tolerancing and inspection practices.

Responsibilities

• Review drawings and programs to plan the setup.
• Mount vises, fixtures, load and touch off tools; set offsets.
• Prove out each new program with dry-run and first piece inspection.
• Handle frequent changeovers between one-offs and short runs.
• Measure parts with calipers, micrometers, gauges; document results.
• Perform routine machine maintenance and troubleshoot issues.

Skills

CNC milling

First-article prove-out

GD&T interpretation

Drawing interpretation

Setup independence

Speeds and feeds

Tools

Calipers

Micrometers

Height gauges

Job description

You will set up our CNC milling machines and run them to produce precision components that meet tight tolerances and customer specifications. Each job comes to you with its drawing and program, and you take it through setup, first-article inspection, and finished parts.

Setup is the core of this role. Most of our jobs are one-offs and short runs, so the machines change over often and you will do that work yourself: mount the workholding, load and touch off the tools, set the offsets, and machine a first piece to prove out the program. You check that piece against the drawing and fine-tune the offsets before running the rest.

Our work is a steady mix of prototypes, one-offs, tooling, and short production runs in aluminum, stainless steel, and tool steels. You will work closely with the owner-engineer and the design team on workholding and setup, and you will be trusted to see each job through to finished parts.

What you will do

Setup and prove-out

• Review the drawing and program for each job and plan the setup before starting.
• Mount and indicate vises and fixtures, then load and touch off tools and set work offsets.
• Prove out every new program: dry-run it, machine a first piece, inspect it against the drawing, and adjust the offsets before running the rest of the job.
• Handle frequent changeovers between one-off, prototype, and short-run jobs, keeping setups efficient and repeatable.
• Raise program or drawing problems with the owner-engineer before running parts.

Machine operation

• Run production jobs while monitoring tool wear, chip load, and part quality.
• Adjust machine parameters and tool offsets as required.

Quality assurance

• Measure and inspect parts with calipers, micrometers, gauges, and height indicators.
• Make sure finished components conform to drawing tolerances and surface finish standards.
• Document measurements and maintain inspection records for traceability.

Maintenance and troubleshooting

• Perform routine maintenance on CNC milling machines.
• Troubleshoot issues such as tool breakage, chatter, and dimensional inconsistencies.
• Recommend process or tooling improvements that reduce setup time or improve output.
• Keep a clean and organized work area in line with shop standards.

Grinding, as needed

• Operate manual or surface grinders for precision finishing where required.
• Set up grinding tools and verify results against tolerances and visual standards.

What you bring

• 5+ years of experience setting up and operating CNC milling machines, including first-article prove-outs.
• Ability to set up a new job independently, from workholding and tool setting through offsets.
• Ability to interpret detailed engineering drawings and GD&T.
• Solid understanding of material behaviour and machining principles, including speeds and feeds and tool selection.
• Experience machining aluminum, stainless steel, and tool steels.
• Familiarity with ISO tolerancing and standard inspection practices.

Nice to have

• Surface grinding experience.
• Experience in a job shop, tool and die, or other high-mix, low-volume environment.
• Familiarity with ISO 9001 or AS9100 quality systems.
• Russian or Ukrainian language skills.

About MAS Precision Parts

MAS Precision Parts has machined custom, tight-tolerance parts in Woodbridge, Ontario since 1989. We are a small job shop serving automotive, aerospace, food processing, and construction customers, with work that runs from one-off prototypes and repairs through tooling and short production runs. The floor covers CNC milling and turning, manual machining, Wire EDM, and surface and jig grinding, so the work is varied and you see parts through from drawing to delivery.