Acu-Rite CNC 3500i user manual Thread Mill Cycle

7.2 Canned Cycles

Thread Mill Cycle

The first move in this cycle is a rapid move to the center of the thread before moving the Z axis. Make sure the tool is properly located before calling up this cycle.

Use the thread milling for cutting inside or outside threads. It cuts either Inch or MM, left or right hand, and Z movement up or down. A single tooth or multi-toothed tool may be used. Start can be at the top or bottom of the hole or boss. The tools are set, as you would normally set TLO.

Field	Code	Description
ZFinish	Z	Absolute Z position where the thread cut
		will finish. This can be above or below the
		start position depending on the direction of
		the thread cut: up or down. (Required)
ZStart	H	Absolute Z position where the thread cut
		starts. This can be above or below the finish
		position depending on the direction of the
		thread cut, up or down. If not set, cycle
		uses the current Z tool position. (Required)
ZSafePosn	P	An Absolute safe Z position above the part
		for rapid moves in X and/or Y. (Required)
		WARNING: P must be above the part to
		avoid a crash while positioning.
MajorDia	D	Major thread Diameter. If this is a tapered
		thread, it is the major diameter at the Z start
		position. Hence, if you have a tapered hole
		and you start at the top and cut down, you
		would have a different major diameter than
		if you started at the bottom and cut up. A
		plus (+) value cuts in the CW direction and
		a minus (-) value cuts in the CCW direction.
		(Required)
ThdDepth	C	Depth of thread. The incremental depth of
		thread on one side. A plus (+) value is inside
		thread, a minus (-) value is outside thread.
		(Required)

162 7 Programming: Canned Cycles, sub-programs