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Vocabulary Term Definition

Canned Cycle         A sequence of machine operations initiated by a single G code. Canned cycles act as shortcuts that simplify the program.

Clearance Plane      A common term for the distance specified by the R level.

Conversational Programming            A programming method that allows an operator to machine a part by responding to a series of questions and prompts. Conversational programming does not reveal the actual program codes.

Counter boring          A hole-making operation that enlarges one end of a previously drilled hole to a certain depth. The enlarged end contains a flat interior.

Depth Of Thread       The distance between the top and bottom of the thread.

Dwell        An intentional time delay during which the rotating tool remains in contact with the work piece. A dwell can be used to improve the finish of a hole.

Initial Level     The imaginary plane parallel to the X- and Y-axes that indicates the tool position as the canned cycle is initiated. The initial level is typically located above the R level.

Lead     The linear distance that the tool advances with one rotation of the spindle.

Left-Hand Tap    A tap that rotates counterclockwise as it enters the hole to cut a thread.

Live Tooling     Power-driven cutting tools such as end mills and drills that are held in the turret of a lathe. Live tools can perform machining operations off the part centerline while the work piece is held in the spindle.

Mode    A programmed function that stays in effect until it is either canceled or substituted with another function.

Multiple Repetitive Cycle A canned cycle for the lathe that uses a single block of code to automatically execute a series of tool passes.

Peck Drilling     A drilling operation that periodically retracts the tool to clear chips or flood the hole with coolant. Peck drilling is often used for holes that are three or four times deeper than the drill diameter.

R Level    The imaginary plane parallel to the X- and Y-axes indicating the safe distance for rapid tool movement from one operation to the next. A typical R level is 0.1 inches away from the part surface.

Right-Hand Tap    A tap that rotates clockwise as it enters the hole to cut a thread.

Spot Drilling     The use of a shorter, sturdier drill to locate a hole for drilling. Spot drilling often uses a drill size slightly larger than the hole diameter to leave a chamfer after the hole is drilled.