CNC Quality Control and Inspection Flashcards
6 cards from real CNC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CNC Quality Control and Inspection flashcards as text
What instrument is used to measure the inside diameter of a precision bore in CNC quality inspection?
Answer: Telescoping gauge with outside micrometer
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.
In GD&T, what does the symbol for 'perpendicularity' look like?
Answer: An upside-down T (⊥)
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.
What does 'Cpk' measure in CNC manufacturing process capability?
Answer: How well a process is centered within specification limits
Cpk measures process capability while accounting for how well the process mean is centered between the upper and lower specification limits.
When using a CMM (Coordinate Measuring Machine), what is a 'datum reference frame'?
Answer: The three mutually perpendicular planes that establish the coordinate system for measurement
A datum reference frame consists of three mutually perpendicular datum planes (A, B, C) that establish the origin and orientation for all CMM measurements.
What does Ra measure in surface finish inspection?
Answer: The arithmetic average roughness of the surface profile
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.
What is the purpose of a go/no-go gauge in CNC production inspection?
Answer: To quickly verify that a feature is within its tolerance limits without measuring the actual dimension
A go/no-go gauge has two ends: the 'go' end must fit, confirming the feature is not undersize; the 'no-go' end must not fit, confirming it is not oversize.