Modern Machine Shop

SEP 2017

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32 MMS September 2017 mmsonline.com DECIDING FACTORS A Focus on Data-Driven Manufacturing builds on these prior advances. This concept uses add-on software in the CNC unit to monitor cutting conditions and make adjustments that compensate for or correct unwanted results. The ruling principle here is to rely purely on the software to achieve these improvements. Rather than requiring additional hardware sensors, this sof t wa re re ad s a nd a n a l y ze s digi ta l s ig n a ls primarily generated by the machine spindle. This spindle condition monitoring software, aptly named AVCM (Adaptive Vibration Control Monitoring), was created by Omative Systems, a solution partner of Siemens. Once installed on the CNC, the software monitors all digital signals from the spindle and literally "learns" the cutting condition. It then adapts the motor, drive, feed and spindle speed accordingly to compensate for a variety of conditions, including workpiece m a te r i a l va r i a n c e s, d i s t a n c e to wo r k p i e c e, CO NTR I BUTO R R A N DY PE A R S O N , S i e m e n s I n d u s t r y (s i e m e n s .c o m /c n c) CNC Software Is the Sensor Today's CNCs enable spindle-condition monitoring, adaptive control and part- production "learning" through software. Special sensors do not have to be installed. One of Omative's AVCM algorithms analyzes the machine's vibra- tion velocity spectrum and automatically activates the preferred process for chatter suppression, thus protecting the machine spindle, cutting tool and workpiece from damage during machining. O ver recent years, the evolution of such con- cepts as condition monitoring and adaptive control have been substantial. Condition moni- toring, as the name implies, watched the relation- ship between theoretical and actual speeds and feeds, making preprogrammed or set adjustments as needed. Adaptive control was the next itera- tion, as the CNC could detect subtle differences in tool and work piece conditions and adjust cutting "on the fly" as the cycle proceeded. The advance of highly complex, non-linear shapes, especially in the aerospace and medical markets, led to the transformation orientation concept. This took computation of the cutting path to a whole new level, basing it on the tooltip relation- ship to the workpiece combined with a look-ahead function. Additional sensing hardware and probes were required, and are still today. A recent, further development is available that

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