Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 730)

Program Interrupts and
Dressing Interrupts
Chapter 22
22-10
Use dressing interrupts to temporarily halt reciprocation or a grinding
cycle and execute a subprogram or paramacro call. This feature allows the
operator/programmer to interrupt a reciprocating grinding operation or
grinding cycle with a wheel dressing operation or some other function.
Three methods of requesting a dressing interrupt are available:
On operator request (through PAL interface usually a push button or
switch)
Auto-Dressing through programming of a grinding cycle (executed at
pre-determined passes in the reciprocating cycle as requested with a D
word in the cycle block)
Through programming a pre-dress operation before execution of the
grinding cycle with a G8n.1
Important: Reciprocation or any cylindrical or surface grinding cycle
(G8n) must be active before a dressing interrupt can be requested.
Dressing interrupts can not be performed when the control is in G80 mode.
The operator can request a dressing interrupt at any time through PAL
(provided a surface/cylindrical grinding cycle or reciprocation is currently
active). For details on how to perform this request, see your system
installer’s documentation. The program called by this dressing interrupt
must have previously been defined using a P word in either a reciprocation
block (G81) or any grinding cycle block (cylindrical or surface). Once you
program a P word, it remains the active P word until another P word is
programmed or an end of program code is executed (M02, M30, or M99).
During grinding cycles (for both cylindrical and surface grinders), the
number of dressing operations to be performed during the course of the
cycle’s execution is defined using a D word. Each of these dressing
operations actually calls a dressing interrupt. The program called for by
this interrupt is also defined in the cycle block with the P word. See
chapters 16 and 17 for details on grinding cycle block format.
The number of dressing interrupts programmed with the D word are evenly
distributed over the course of the cycle’s execution. The dressing interrupt
request is automatically made just after the plunge moves.
22.2
Dressing Interrupts
22.2.1
Operator Request for
Dressing Interrupt
22.2.2
Auto-Dressing Request
during Grinding Cycle (D
word)