Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Instrukcja Użytkownika Pobierz pdf (Strona 559)

100

101

Surface Grinding Fixed Cycles

Chapter 16

16-9

I - 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 X 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 t he coordinate of the X axis

prior to execution of the surface grinding cycle. If the X axis is already

reciprocating when the surface grinding cycle block is executed, then the

start point (when incremental mode is active) is the secondary reversal

point. This was explained on page 16-4.

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

programmed only once in a part program. Any subsequent surface

grinding blocks (G82 -- G86) use a previously programmed value if a new

value is not programmed. Programming an I word in any

program block

while reciprocation is active changes the coordinate of the secondary

reversal point.

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.

Important: It is the programmer’s responsibility to make sure that the

crossover and reci procating moves extend beyond the part sufficiently such

that the plunge move can be completed before the wheel comes back in

contact with the part. Crossover and plunge moves begin as the

reciprocation axis decelerates. Therefore, feedrate, acceleration and

deceleration should be considered for all axes involved.

Z - crossover position.

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 crossover motion. If in absolute mode (G90 active) then the

value entered here is the Z coordinate of the end point of the crossover

move.

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

programmed only once in a part program. Any subsequent surface

grinding blocks (G82 -- G86) use a previously programmed value if a new

value is not programmed.

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