Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 609)

Cylindrical Grinding Fixed Cycles
Chapter 17
17-35
I -- medium plunge distance
I defines the medium plunge distance. If I is programmed it also defines
the endpoint of the previous plunge motion (end point of rough plunge if R
is programmed or rapid if no rough plunge is programmed). If I is not
programmed the medium plunge phase of the cycle is not performed.
Always program I as an unsigned incremental value. Measure I along the
X axis from the final plunge depth programmed with the X word. I must
be smaller than the previously programmed plunge distance (typically R).
The wheel begins to plunge the medium plunge distance once the R plane
has been reached. The I plunge is performed at the feedrate E.
Q -- fine plunge distance
Q defines the fine plunge distance. If Q is programmed it also defines the
endpoint of the previous plunge motion. Always program Q as an
unsigned incremental value. Measure Q along the X axis from the final
plunge depth programmed with the X word. Q must be smaller than the
previously programmed plunge distance (typically I). The wheel begins to
plunge the fine plunge distance after the I plunge is completed. The Q
plunge is performed at the ,F feedrate.
K -- blend distance
K defines the distance of the blend move in the G89 cycle. Always
program K as an incremental value. K can be a signed value (+ or --).
Measure K in the signed direction along the Z axis from the shoulder end
point determined with the Z word. The blend is performed at the ,E
feedrate. The wheel performs the blend move after the X plunge depth has
been reached and any spark-out (L) has completed.
F -- coarse plunge feedrate
The feedrate entered here is for the coarse plunge phase R. F must be
within the range of legal F words defined for your system. If no F word is
programmed, then the last F word executed in the part program is used as
the coarse plunge feedrate. An F word must be programmed when or
before the G89 mode is entered. Single digit F words are valid for the
coarse plunge feedrate. Programming F0 selects the maximum cutting
feedrate configured in AMP.
This parameter is the system F word. Programming it here alters the
feedrate for any subsequent axis motion. This feedrate can be programmed
in IPM, IPR, or V/D feed modes.