Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 595)

Cylindrical Grinding Fixed Cycles
Chapter 17
17-21
Figure 17.5
G84 Multi-pass Face Grinding Motions
Retract I L
X
Z
Q
START
Part
12055-I
Programming a G84 causes the control to execute a multi-pass face
grinding cycle. This cycle is typically used to grind the face of a part in a
situation where a shifting of the grinding wheel position is necessary to
cover several different surfaces to be ground on the face. Axis 2, the X
axis in our case, is the dither axis and axis 1, the Z axis, is the plunge axis.
The G84.1 cycle is identical but begins with a pre-dress operation prior to
the grind.
The G84 cycle differs from the G82 cycle in several ways. First, the X
axis dither differs from reciprocation in that it is made up motions that are
centered about the X axis coordinate and are made only during the plunge
move. Second, the plunge motion is a continuous move to the plunge
depth (Z) instead of a series of plunge pick moves as used with the G82
cycle.
The third and most significant difference between the G84 and the G82
cycles is that the G84 incorporates an X axis shift, made after the
completion of each plunge. The length of this plunge shift (distance
between plunges) is defined by the Q parameter.