Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 592)

Cylindrical Grinding Fixed Cycles
Chapter 17
17-18
5. The reciprocation and plunge pick moves continue until the plunge
depth (X) is reached.
6. After the plunge depth (X) is reached, reciprocation continues and
the programmed number of spark-out passes are executed.
The following describes each of the cycle’s parameters.
Z -- reciprocating axis distance, primary reversal point. If in
incremental mode (G91 active) then the value entered here is a signed
incremental value indicating the distance from the start point to the end of
the primary reciprocating motion (the primary reversal point).
The start point for the reciprocating axis is the coordinate of the Z axis
prior to execution of the grinding cycle. If the Z axis is already
reciprocating when the grinding cycle block is executed, then the start
point (when incremental mode is active) is the secondary reversal point.
This was explained on page 17-5 in the section describing reciprocation.
If in absolute mode (G90 active) then the value entered here is the Z
coordinate of the primary reversal point.
This parameter is ”program modal,” meaning that it needs to be
programmed only once in a part program. Any subsequent grinding blocks
that use a reciprocating axis (G81 -- G83) use a previously programmed
value if a new value is not programmed. Programming a Z word in any
program block while reciprocation is active changes the coordinate of the
primary reversal point.
K -- reciprocating axis distance, secondary reversal point. If in
incremental mode (G91 active) then the value entered here is a signed
incremental value used to indicate the distance from the start point to the
end of the secondary reciprocating motion. If in absolute mode (G90
active) then the value entered here is the Z coordinate of the end point of
the secondary reciprocating motion. If no value is entered for this, then the
start point is used as the end point of the secondary reciprocating motion.
The start point for the reciprocating axis is the coordinate of the Z axis
prior to execution of the grinding cycle. If the Z axis is already
reciprocating when the grinding cycle block is executed, then the start
point (when incremental mode is active) is the secondary reversal point.
This was explained on page 17-5 in the section describing reciprocation.
This parameter is ”program modal,” meaning that it needs to be
programmed only once in a part program. Any subsequent grinding blocks
that use a reciprocating axis (G81 -- G83) use a previously programmed
value if a new value is not programmed. Programming a K word in any
program block while reciprocation is active changes the coordinate of the
secondary reversal point.