D - number of auto-dress executions – Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set User Manual
Page 563
Surface Grinding Fixed Cycles
Chapter 16
16-13
D - number of auto-dress executions.
The number entered here (any integer from 0 to 999) indicates how many
times the dress program (P) is executed over the duration of the grinding
cycle. The way these dress operations are distributed throughout the cycle
varies, depending on the particular cycle. In general, the dress operations
occur immediately after a plunge move at reciprocation reversal points.
This parameter is not “program modal.” If a value for the number of dress
executions is not programmed, then the dress program P is not executed
for that cycle. This does not affect pre-dress requests or operator requested
dressing as described in chapter 21.
The format for the G81 reciprocation mode is as follows:
G81Z__K__E__P__;
G81Y__J__E__P__;
G81X__I__E__P__;
Table 16.A summarizes the G81 mode parameters. For a detailed
description of these parameters, see the text below and page 16-8.
Table 16.A
G81 Mode Parameters
Parameter:
Definition:
Default Value:
Possible Value:
Programmed axis
2
reciprocation primary reversal point
from last cycle programmed
abs. or inc.
Reciprocation axis integrand
3
reciprocation secondary reversal point
from last cycle programmed
abs. or inc.
E
2
reciprocation feedrate
from last cycle or last F
valid F word
P
3 for G81 2 for G81.1
dress program number
from last cycle programmed
valid program number
1
must be programmed
2
must have been programmed in some previous block if omitted
3
optional
Programming a G81 or G81.1 causes the control to execute a grinding
reciprocation without a coordinated pick or plunge motion. The G81.1
begins with a pre-dress operation prior to the reciprocation move.
Reciprocation motion is described on page 16-4 of this chapter.
This reciprocation move is executed on whichever axis is programmed in
the G81 block, regardless of the active plane. The value entered with the
axis programmed defines the primary reversal point for the reciprocating
axis. It is entered as either a distance from the start point (G91) or as an
absolute position (G90). The integrand for the axis programmed defines
the secondary reversal point, either as a distance from the start point (G91)
or as an absolute position (G90).
16.3
G81 or G81.1 Reciprocation
Without Cross Pick or
Plunge