Rockwell-automation 8520-GUM 9/Series CNC Grinder Operation and Progra Uživatelský manuál stáhnout pdf (Strana 217)

100

101

Running a Program

Chapter 7

7-29

In Figure 7.6, notice that t he control only recognized 6 jog moves upon

returning instead of the actual 1 1 moves that were made to retract the

wheel. This is because the jog retract feature records consecutive jog

moves on the same axis as one move.

ATTENTION: If the number of jog retract moves performed

exceeds the maximum allowed number set in AMP, the control

moves the grinding wheel directly from the final point of jog

retract to the last remembered jog retract point along a straight

line when you press

<CYCLE START>. Then t he wheel is

returned in the normal jog retract fashion.

Figure 7.7

Jog Retract Moves that Exceed the Maximum Allowed in AMP

Returnpath

12011-I

Figure 7.7 emphasizes the possible problems that can result from

exceeding the maximum allowed jog retract moves. In this example, the

number of allowed moves set in AMP is 4.

When you press the cycle start button at the end of the 7th j og move, t he

control ignores moves 5, 6, and 7 and takes the shortest path to the

endpoint of exit move 4. This is because the maximum number of jog

retract moves set in AMP has been exceeded. After reaching the endpoint

of move 4, the control continues the jog retract return operation as normal.

If the jogging moves of 5, 6, and 7 were intended to avoid a protrusion

during the jog retract, a collision could result when returning the wheel.

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