CNC Prototype Machinist

Insight Manufacturing S; Murphys (CA); On-site; USD 70,000 - 90,000; Full time

Job summary

Insight Manufacturing S in Murphys, CA is seeking an experienced CNC Prototype Machinist to join our machine shop team. Under general supervision, you will develop, write, and edit CNC programs to shape precision metal parts and prototype components.

You will set up and operate CNC and manual machines, read blueprints and CAD data, and work with engineers to refine designs for manufacturability and accuracy in prototype and low-volume production.

Qualifications

• 5-7 years of combined CNC programming and machining experience.
• Associate’s degree or technical certificate in manufacturing technology.
• Proficient in reading blueprints and GD&T.
• Experience in prototype or low-volume environments.
• NIMS or equivalent credentials desirable.

Responsibilities

• Analyze orders and CAD data to determine operations and dimensions.
• Write, test, and revise CNC programs.
• Set up tooling, fixtures, and cutting parameters.
• Operate CNC and manual machines to fabricate prototype and production components.
• Review blueprints and CAD models to ensure dimensional accuracy.
• Calculate dimensions and tolerances with precision instruments.
• Inspect finished parts for quality using precision tools.
• Prepare setup sheets and process notes for repeatability.
• Collaborate with engineers and machinists to optimize manufacturability.
• Maintain knowledge of CNC controls and tooling.
• Train machinists and operators as needed.

Skills

CNC programming

CAD/CAM software

Machining setup

Precision measurement

Blueprint reading

GD&T interpretation

Team collaboration

Problem solving

Independent work

Communication skills

Education

Associate’s degree or technical certificate in manufacturing technology

NIMS credentials desirable

Tools

Fanuc controls

Haas controls

Fusion 360

CMM

Job description

CNC Prototype Machinist

Insight Manufacturing S Murphys, California, United States

About this position

We are seeking an experienced CNC Prototype Machinist to join our machine shop team. Under general supervision, develops, writes, and edits programs that direct automated machine tools to cut and shape precision metal parts, tools, and products. Additionally, sets up and operates CNC and manual machining equipment to product prototype components and precision parts. Uses blueprints, CAD data, and engineering sketches to ensure all specifications, dimensions, and tolerances are met. Works closely with engineers and production staff to refine designs for manufacturability, accuracy, and efficiency in prototype and limited-run production environments.

Key Responsibilities

• Analyze job orders, blueprints, CAD data, and engineering documentation to determine machining operations, sequences, and dimensions.
• Write, test, and revise CNC programs to control machining or processing of metal or plastic parts.
• Select and set up appropriate tooling, fixtures, and machining parameters such as cutting speeds, feed rates, and depths of cut.
• Operate CNC and manual machine tools (vertical mills, horizontals, lathes, grinders, etc.) to fabricate prototype and production components.
• Review and interpret blueprints, CAD models, and specifications to ensure compliance with dimensional and tolerance requirements.
• Calculate dimensions and tolerances using precision instruments such as micrometers, calipers, and height gauges.
• Inspect finished products to verify accuracy and quality using precision measuring tools and visual inspection techniques.
• Perform setups, adjustments, and minor maintenance on machinery as needed to maintain accuracy and efficiency.
• Simulate or test programs to ensure that machinery functions properly and meets engineering requirements.
• Prepare setup sheets, documentation, and process notes for repeatability and training.
• Collaborate closely with engineers, machinists, and production staff to optimize prototype manufacturability and machining processes.
• Maintain knowledge of evolving CNC control systems, programming languages, and machining technology.
• Train or provide technical guidance to machinist and operators as needed.

Qualifications

• CNC programming (Proficiency with Fanuc/Haas controls)
• CAD/CAM software proficiency (Proficiency in Fusion 360, or similar software)
• Setup and operation of CNC and manual machine tools
• Precision measurement and quality inspection
• Blueprint reading, mechanical drafting, and GD&T interpretation
• Knowledge of machining materials and processes (metals, plastics, composites) Must have basic understanding of office administration.
• Strong organizational and time management skills
• Critical thinking and problem-solving ability
• Works independently with minimal supervision
• Effective written and oral communication
• Adaptable and able to multitask under changing priorities
• Team-oriented, collaborative approach with engineers and peers
• Continuous learning mindset with focus on innovation and accuracy
• Associate’s degree or technical certificate in manufacturing technology, machine tool technology, or related field.
• 5-7 years of combines CNC programming and machining experience, ideally in prototype or low-volume environments.
• NIMS or equivalent credentials are desirable.
  • Industries: Aerospace, automotive, metal fabrication, precision tooling and prototyping sectors.

Physical & Environmental Conditions

• Most functions are performed indoors.
• Temperature variation reasonably controlled by heaters and fans.
• Occasional exposure to moving mechanical parts.
• Occasional risk of electrical shock and vibration.
• Noise level is usually loud.
• Safety glasses are provided and required when working in restricted areas.

Equipment

• CNC mills, horizontals, lathes, and multi-axis machining centers
• Manual mills, lathes, and grinders
• CAD/CAM software and simulation tools (Fusion 360)
• Precision measuring instruments (micrometers, calipers, gauges, CMM)
• Hand tools, fixtures, vises, and inspection equipment
• Computers and CNC control interfaces.