G85 - Bore: Feed In, Feed Out

Bore Cycle with feed in and feed out.

The G85 bore cycle initiates boring operation at defined XY position at defined height and for defined depth. G85 cycle can be repeated at any given XY position until cycle is cancelled with G80 or with any other motion command(G01/G00).

Single boring operation can be divided into following phases:

Phase 1: Spindle

If spindle is OFF prior cycle execution and cycle code does not use optional parameter S, software will return error.

If spindle is OFF prior cycle execution and cycle code uses parameter S, spindle will turn ON and speed will be set with parameter S.

If spindle is ON and cycle code does not use parameter S, spindle speed remains as set with pre-existing S value.

If spindle is ON and cycle code uses parameter S, new spindle speed is set with parameter S value.

Phase 2: XY position
The boring XY position is determined by the active distance mode and optional XY parameters.

When the cycle code does not include optional XY parameters, the boring process will occur at the current machine position. This applies regardless of whether the active distance mode is G90 or G91.

If G90 is active and the cycle code includes XY parameters, the boring process will take place at the position specified by the XY parameters.

If G91 is active and the cycle code includes XY parameters, the boring process will take place at the position defined by the XY parameters, taking into account the G91 distance mode.

Phase 3: R level
R level is Z height where boring starts. R level is set with parameter R. Machine Z axis travels to R plane at traverse speed.

Phase 4: Plunge to bottom Z
From R plane machine descends to bottom Z level, defined with parameter Z. If cycle uses F parameter, machine travels to bottom Z level at set F speed. If cycle does not use F parameter value, machine travels to bottom Z level at F speed set prior of cycle execution.

Phase 5: Bottom Z, dwell and retract
Once machine reaches bottom Z level position, and if P parameter is used, it dwells for a set period of time and retracts at feed speed to pre-defined retract height. If P value is not used, machine retracts as soon as bottom height is reached.

Retract height is defined with G98/G99, which can be either R plane or init height value.

If G98 is active, retract height is init height.

If G99 is active, retract height is R plane.

Phase 6: Spindle
If S parameter is used, spindle is turned off at retract height and pre-existing S value is restored.

If S parameter is not used and spindle is turned ON prior cycle execution, spindle state remains unchanged.

G85 <X> <Y> R Z <F> <P> <S>

G00 X0 Y0 Z10
G98 G85 X0 Y0 R0 Z-15 P0.5 F500 S750
X10
X20
X30

G86, G87, G88, G89