CNC Precision Measurement & Quality Control

Question 1

What tool is commonly used to measure external dimensions with high accuracy?

Accepted Answer

Micrometer

Answer

A micrometer is a precision measuring instrument commonly used to measure external dimensions with very high accuracy, typically to thousandths of an inch or hundredths of a millimeter. Its fine-pitch screw mechanism allows for extremely precise adjustments and readings. This makes it more accurate than a caliper for many critical dimension measurements.

Question 2

What does SPC stand for in quality control?

Accepted Answer

Statistical Process Control

Answer

SPC stands for Statistical Process Control, which is a method used in quality control to monitor and control a process using statistical techniques. By collecting and analyzing data from a process, SPC helps identify variations, predict future performance, and ensure that the process remains within acceptable limits. This leads to consistent product quality and reduced defects.

Question 3

Which instrument measures internal dimensions precisely?

Accepted Answer

Inside micrometer

Answer

An inside micrometer is a precision measuring instrument specifically designed to measure internal dimensions, such as the diameter of a bore or the width of a slot. Unlike an outside micrometer, which measures external features, the inside micrometer has measuring faces that expand outwards to contact the internal surfaces. This allows for precise measurement of internal features.

Question 4

What is the function of a dial indicator?

Accepted Answer

Measures displacement or alignment

Answer

A dial indicator is a precision measuring tool used to measure small linear displacements or variations in surface flatness, concentricity, or alignment. It converts linear movement of a plunger into rotational movement of a needle on a dial, providing a visual reading of deviations from a reference point. It's essential for checking runout, parallelism, and other geometric tolerances.

Question 5

Which measurement tool can provide readings in both metric and imperial units?

Accepted Answer

Digital caliper

Answer

A digital caliper is a versatile measuring instrument that can measure external, internal, depth, and step dimensions. Its digital display allows for easy reading and often provides the option to switch between metric (millimeters) and imperial (inches) units with the press of a button. This dual-unit capability makes it a highly convenient and widely used tool in various industries.

(CNC) Computer Numerical Control Machinist Technical Practice Test

(CNC) Computer Numerical Control Machinist Technical Practice Test

CNC Precision Measurement & Quality Control