ANN	Artificial Neural Networks
BPNN	Backpropagation Neural Network
BUE	Built-Up Edge
CNC	Computer Numerical Control
CNN	Convolutional Neural Network
FN	False Negative
FP	False Positive
GRNN	General Regression Neural Network
IR	Infrared
P	Precision
PMMA	Polymethyl methacrylate
R	Recall
r1	Actual workpiece radius
r2	Expected workpiece radius
TN	True negative
TP	True positive
VB	Flank wear
ΔD	Diameter deviation