Acu-Rite CNC 3500i user manual Chip Break Cycle

7.2 Canned Cycles

Chip Break Cycle

This is the chip-breaker peck-drilling cycle, generally used to peck-drill medium to deep holes. The cycle feeds from the R-plane to the first peck depth in Z, rapid retracts the chip-break increment (W), feeds to the next calculated peck depth (initial peck less J), and continues this sequence until it reaches a U depth, or until final hole depth is reached. The peck distance is never more than I or less than K.

This cycle enables optimum drilling conditions for holes. For maximum efficiency in deep hole drilling, set parameters to accommodate the material and tool types used. Generally, the deeper the hole, the smaller the peck distance (J). This prevents the binding of chips, tool, and workpiece. Set U to retract the drill completely at set depth intervals.

Field	Code	Description
ZDepth	Z	Absolute hole depth. (Required)
MinPeck	K	Minimum peck distance (positive
		dimension). Required.
StartHgt	R	Initial Z start point, in rapid. (Required)
PeckDecr	J	Amount to subtract from previous peck
		(positive dimension). Required.
FirstPeck	I	First peck distance (positive dimension).
		Required.
ReturnHgt	P	Z return point after hole depth, in rapid.
Retract	U	Incremental depth between full retracts
Dep		(positive dimension).
ChipBrkInc	W	Chip break increment (positive dimension).
Feed	F	Feedrate

G-code format: G87

152 7 Programming: Canned Cycles, sub-programs