Penetration of a cutting tool measures A (Engagement) -- it is the distance between two plane, this two plane are perpendicular the measurement at place make choice of direction, make through on action cutting blade two the distance between afore-mentioned two plane is the biggest drop respectively. Back penetration of a cutting tool measures Ap -- point to to the serious straight space between the surface and work surface already was machined on workpiece commonly. (cutting deepness) (Back Engagement) side penetration of a cutting tool measures Ae -- in parallel at working plane perpendicular the volume of penetration of a cutting tool that measures on the feed movement way at cutting blade base point. (Working Engagement) feed penetration of a cutting tool measures Af -- the penetration of a cutting tool that measures on the feed movement way in cutting blade base point is measured (Feed Engagement) cutting speed Vc -- it is the some on blade of cutting tool cutting the dot is in what move direction actively to go up at work surface relatively. (Cutting Speed) feed F -- cutting tool is opposite on feed movement way measure at the displacement of workpiece (Feed) every tine feed Fz -- many tine cutting tool every turn or every age in every journey move in feed at workpiece relatively move CNC Milling
CNC Machining