Lapping (Lap) Machine Operator

CMI Group Aerospace & Defense•Phoenix, AZ

3d•Onsite

About The Position

A Lapping (Lap) Machine Operator in aerospace manufacturing is a precision machinist responsible for finishing metal, ceramic, or composite aircraft components to micro-inch tolerances. Lapping is a surface-finishing process that uses an abrasive slurry to achieve extreme flatness, smoothness, and exact geometric dimensions.

Requirements

High school diploma or equivalent.
Typically 1–5+ years of experience in close-tolerance manual machining or grinding, specifically within an aerospace manufacturing environment.
Solid understanding of Geometric Dimensioning and Tolerancing (GD&T) principles.
Must meet ITAR (International Traffic in Arms Regulations) requirements as a "U.S. Person" (citizen, green card holder, or permanent resident) due to defense and controlled military data restrictions.
Able to work 40+ hours per week.
Sufficient verbal and written communication skills.
Good problem solving skills.

Responsibilities

Set up and operate manual, power-stroked, or automated lapping, polishing, and honing machines.
Mix and apply correct abrasive compounds and polishing media (e.g., diamond or silicon carbide slurries) based on the blueprint specifications.
Use highly calibrated measuring tools like micrometers, bore gauges, digital height stands, and air gauges to verify dimensions.
Read and interpret complex engineering drawings, CAD models, and process routers to determine exact product sequences.
Compute clearances, tapers, and material removal rates to maintain close tolerances.
Clean, deburr, and package finished aerospace parts to protect their surfaces.
Partner daily with quality assurance, manufacturing engineering, and production teams to optimize cycle times and improve efficiency.