Limiting wear offset amount

Submitted by Suhas L. More of Macro CNC Solutions


If an operator makes a mistake with an offset entry, the results can be disastrous. While it may not be possible to completely eliminate the potential for mistakes, you may be able to error-trap some pretty obvious error conditions. When making wear offset adjustments, for example, an operator should never need to have more than about plus or minus 0.3 inches in a wear offset (X or Z register). If they do, they’ve probably made an entry mistake – possibly typing 0.5 instead of 0.0005 – or 0.005, or even 0.05.


Error trapping this kind of mistake is easy with custom macro B. Consider this main program:

In the main program just before each turret index:

  • .

  • .

  • .

  • G65 P1000 T0101 U0.3 W0.3 (Test offset)

  • T0101 (Turret index)

  • .

  • .

  • .

Before every turret index, include a G65 command to call the testing macro the tool station number (we’ve duplicated the turret index word), the maximum wear offset X value (with U) and the maximum wear offset Z value (with W). With our example, if more than 0.3 or less than -0.3 is in an X or Z wear offset register, an alarm will be sounded.


Here is the custom macro that does the error-checking:

  • O1000 (Custom macro)

  • T#20

  • #5=FIX[#20/100]

  • #6=#20-[#5*100]

  • #1=#[2000+#6]

  • #2=#[2000+#6]

  • IF[#1 GT #21] GOTO 99

  • IF[#1 LT [0-#21]] GOTO 99

  • IF[#2 GT #23] GOTO 999

  • IF[#2 LT [0-#23]] GOTO 999

  • GOTO 100

  • N99

  • #3000=101(X OFFSET OUT OF RANGE)

  • N999

  • #3000=102(Z OFFSET OUT OF RANGE)

  • N100

  • M99


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