Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Manual de usuario descargar pdf (Pagina 599)

100

101

Cylindrical Grinding Fixed Cycles

Chapter 17

17-25

The third and most significant difference between the G85 and the G83

cycles is that the G85 incorporates a Z axis shift, made after the

completion of each plunge. The length of this shift (distance between

plunges) is defined by the Q parameter.

The following describes each of the cycle’s parameters.

Z -- last plunge point. If in incremental mode (G91 active) then the value

entered here i s a signed incremental value indicating the distance from the

start point to the point where the last plunge motion (defined by the X

parameter) is to be executed. The start point is the coordinate of the Z axis

prior to execution of the grinding cycle.

If in absolute mode (G90 active) then the value entered here is the Z

coordinate of the last plunge point.

If no value is entered for X, then the plunge move is made from the start

point only. Any Q parameter value programmed is ignored.

K -- dither amount. The value entered here is a signed incremental value

used to indicate the total

distance that the Z axis is to dither about the start

point. The dither axis oscillates half the incremental distance entered here

on both sides of its plunge point. If no value or a value of zero is entered

for this, then the plunge motion is executed without any Z axis dither.

Important: In grinding fixed cycle blocks where changes are made from

absolute to incremental or incremental to absolute modes within the block,

the integrands I, J and K are always in the last mode

programmed in the

block, regardless of their position in the block.

X -- p lunge depth. If in incremental mode (G91 active) then the value

entered here i s a signed incremental value used to indicate the distance

from the start point to the end of the plunge motion. If in absolute mode

(G90 active) then the value entered here is the X coordinate of the end

point of the plunge move.

The plunge move with the G85 cycle is made with one continuous motion

until the plunge depth is reached. At that point, any programmed spark-out

passes are made (as defined by the L parameter). After the spark-out

passes are completed, the plunge axis retracts to the start point at its rapid

feedrate.

This parameter is “program modal,” meaning that it needs to be

programmed only once in a part program. Any subsequent cylindrical

grinding blocks (G82 -- G88) use a previously programmed value if a new

value is not programmed.

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Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Manual de usuario Pagina 599

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