Basic Machining Terminology (2)

Feed: per Revolution: The distance traveled by the cutting tool per revolution.

(mm/min) : Length of movement of cutting tool or workpiece per minute.

n (mind) : Spindle speed of workpiece (Turning)

Spindle speed of cutting tool (Milling. drilling)

Table Feed : The distance traveled by the workpiece and/or cutting tool per minute. (When milling)

fz(mmltooth) : Feed per tooth

z: Number of teeth

n (min-1) : Spindle speed

Feed Per Tooth : The distance traveled by a milling cutter divided by the number of teeth .(When milling)

Fz(mm/tooth) : Table feed

z : Number of teeth

n (min-1) : Spindle speed

Actual machining : Actual machining time represents the time spent on machining only. It does not include prep-time or the time needed for tool change .

Non-machining : Non-machining time refers to preparatory time and tool change time.

Continuous machining : Continuous machining is a condition in which the cutting edge remains in contacts a workpiece and continuously produces chips. (Mainly when turning and drilling, however due to workpiece geometry it may vary)

lnterrupted machining : Interrupted machining is n condition in which the cutting edge engages and disengages from the workpiece. thus there are areas where chips are not developed. (Mainly when rnilling.)

up cut milling (also known as conventional milling): A method of machining in which the cutting edge engages the work at a depth of Omm and then as rotating reaches the full depth of cut". When up cut milling is carried out the tool rotation is opposite to that of the direction of feed.

Down cut milling (also known as climb milling) : A method of machinine in which a cutting edge engages the workpiece at the full depth of cut and then aS rotating the depth of cut reaches 0mm. When down cut milling is carried out the tool rotation and the direction of feed is in the same direction.

Coolant : Coolant is a lubricant that is used to prevent tolerance deviations caused by the heat generated whilst rnachinins. Coolant also improves the chip disposal properties.

Dry machining : Dry machining is a method of machining that does not use any coolant.

Wet machining: machining is a method of machining that uses coolant.

High-pressure air blow : High-pressure air blow is used to dispel the chips generated when machining,so as to prevent the chips from coming into contact with the cutting edge.

Chilled air machining : Chilled air machining is a method of machining that employs a system that directs chilled air (-30 degree or below) directly towards the cutting edge. A special generator is required to provide the chilled air.

Mist machining: Mist machining is a method of machining that employs a system that directs a mixture of high-pressure air with coolant directly towards the cutting edge. A special generator is required to provide the mixture used .