CNC CNC Quality Control and Inspection

Question 1

What instrument is used to measure the inside diameter of a precision bore in CNC quality inspection?

Accepted Answer

Telescoping gauge with outside micrometer

Answer

Outside micrometer

Answer

Vernier caliper

Answer

Depth micrometer

Question 2

In GD&T, what does the symbol for 'perpendicularity' look like?

Accepted Answer

An upside-down T (⊥)

Answer

A circle with crosshairs

Answer

Two parallel lines (//)

Answer

A circle with a target

Question 3

What does 'Cpk' measure in CNC manufacturing process capability?

Accepted Answer

How well a process is centered within specification limits

Answer

The cutting speed in meters per minute

Answer

The number of defects per million opportunities

Answer

The surface roughness average value

Question 4

When using a CMM (Coordinate Measuring Machine), what is a 'datum reference frame'?

Accepted Answer

The three mutually perpendicular planes that establish the coordinate system for measurement

Answer

The software version used to program the measurement routine

Answer

The stylus tip diameter used for the measurement

Answer

The ambient temperature at which measurements are taken

Question 5

What does Ra measure in surface finish inspection?

Accepted Answer

The arithmetic average roughness of the surface profile

Answer

The maximum peak-to-valley height

Answer

The root mean square of roughness values

Answer

The spacing between adjacent surface peaks

Question 6

What is the purpose of a go/no-go gauge in CNC production inspection?

Accepted Answer

To quickly verify that a feature is within its tolerance limits without measuring the actual dimension

Answer

To measure the exact diameter of a finished feature

Answer

To check surface finish on critical bores

Answer

To confirm a thread's pitch and lead angle