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

A telescoping gauge expands to fit the bore diameter, then the set distance is measured with an outside micrometer to get an accurate inside diameter reading.

Question 2

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

Accepted Answer

An upside-down T (⊥)

Answer

Perpendicularity in GD&T is represented by an upside-down T symbol (⊥), indicating that a surface or axis must be 90° to the referenced datum.

Question 3

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

Accepted Answer

How well a process is centered within specification limits

Answer

Cpk measures process capability while accounting for how well the process mean is centered between the upper and lower specification limits.

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

A datum reference frame consists of three mutually perpendicular datum planes (A, B, C) that establish the origin and orientation for all CMM measurements.

Question 5

What does Ra measure in surface finish inspection?

Accepted Answer

The arithmetic average roughness of the surface profile

Answer

Ra is the arithmetic mean of the absolute values of the profile deviations from the mean line, providing an average roughness value for the surface.

CNC - Cutting Practice Test

CNC - Cutting Practice Test

CNC CNC Quality Control and Inspection