Certified Instrument Specialist (CIS) Practice Exam 2025 - Free CIS Practice Questions and Study Guide

The process that primarily focuses on removing excess material from an instrument is grinding and milling. These manufacturing processes involve the use of mechanical apparatus to achieve a desired shape or finish by systematically removing material.

Grinding typically uses an abrasive wheel to smooth or refine the surface of a workpiece, effectively eliminating any unwanted material and achieving precise dimensions. Milling involves the use of rotating cutters to remove material from a workpiece in a controlled manner, allowing for the creation of complex shapes and features. Both techniques are essential in instruments where accuracy and surface finish are critical, making them ideal for achieving specific tolerances required in precision applications.

In contrast, processes like polishing are aimed at enhancing surface finish and aesthetics rather than significantly removing material. Forging involves shaping material through deformation without removing it, and tempering is related to heat treatment processes to improve material properties rather than shaping. Understanding these distinctions helps clarify why grinding and milling are the most relevant processes for removing excess material.