What does the recruitment m3 process mean?

a: what does the numerical control lathe program m3s5 mean?

M3 stands for the forward rotation of the spindle, and S5 stands for 5 revolutions, so the spindle rotates 5 revolutions.

m3 spindle rotates clockwise; S3 refers to the spindle speed of 3 revolutions per minute; F2 refers to the feed speed of 2mm/ min; G4 is a pause instruction. If G4X1. is input, it will be paused for 1 seconds. D is tool radius compensation, and D15 means calling the radius compensation of No.15 tool. The corresponding H is tool length compensation.