Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Manual de usuario descargar pdf (Pagina 591)

100

101

Cylindrical Grinding Fixed Cycles

Chapter 17

17-17

Figure 17.4

G83 Incremental Plunge Grinding Motions

Part

Reciprocation

START

Spark --outpasses

12054-I

Programming a G83 causes the control to execute a plunge grinding cycle.

This cycle is typically used to grind the diameter of a part. Axis 1, the Z

axis in our case, is the reciprocation axis and axis 2, the X axis, i s the

plunge axis. The G83.1 cycle is identical but begins with a pre-dress

operation prior to the grind.

For example, if t he G18 (ZX) plane is active and configured such that the

Z axis is axis one and the X axis is axis two, then the X axis would be the

plunge axis and the Z axis would be the reciprocating axis. The cycle

executes as follows:

1. The Z axis moves to the primary reversal point (Z) at feedrate E.

2. The plunge pick move (I) begins at feedrate F as the Z axis

decelerates to the primary reversal point.

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

reci procation moves extend beyond the part sufficiently such that the

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

with the part. Plunge moves begin as the reciprocation axis decelerates.

Therefore, feedrate, acceleration and deceleration should be considered for

all axes involved.

3. The Z axis moves to the secondary reversal point (K).

4. The plunge pick move (Q) begins as the Z axis decelerates to the

secondary reversal point.

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