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People and Devices One of the most important trends is the question of who,


exactly, are using these devices—and what they need to know to use them correctly. “If we go by sheer numbers, more profilometers are used in production than in quality labs because of the need to measure at the point of production,” stated Nugent, a trend that has been growing for all aspects of metrology. Can machine tool operators and


production workers measure surfaces accurately? “The issue is that he or she is probably an expert CNC machine operator and one day they are told to use a surface finish gage. Now they have to be an expert at surface finish,” he said. This is trickier than it sounds, since measuring surfaces can be fairly involved to ensure engineered surfaces meet precise specifications. There is more than one way of measuring surface roughness. Arith-


metic average, or Ra, is the most common, but there are others such as


root-mean-square, or Rq, or maximum valley depth, Rv, or peak height, Rp. Rz is the average maximum peak to valley


of five consecutive sampling lengths within the measuring length. “The vast majority of our customers are measur-


ing Ra, and most of them do not know there is more than one measurement; they talk about THE surface finish, as if it was one thing,” he said. Simply vary- ing parameters and filters on the device itself may fool the operator into thinking the surface meets specifications if they do not understand the basics. In response, Mahr has focused its


efforts on delivering units that are as automated as possible. One example is the new PS 10, a hand-held unit with a display that resembles a smartphone. It was first introduced in September 2016. “You can plug the PS 10 into a PC via a USB port, and download data


June 2017 | AdvancedManufacturing.org 69


or create PDF reports—we want this device to be used by someone who is not lab-trained,” he said. That is done via an integrated, removable roughness standard as well as an automatic cut-off selection.


FORM


FORM MEASUREMENEASUREMENT Now With Unprecedented Speed & Accuracy


Checking surface form accuracy of fi nished parts while still in the machine, no longer requires multiple-touch, long cycle time routines using a touch probe. Working in conjunction with the machine to scan the part’s profi le in one continuous motion, the new Marposs G25 gauge accu- rately measures surface form to within 0,4 µm repeatability at speeds up to 1500 mm/min.


The compact, shop-fl oor hardened G25 gauge enables you to rapidly verify part surface form accuracy on a variety of ground or turned parts with a minimum of downtime. Plus, you can use the same device to perform touch functions for determining part location and alignment.


Learn more at 1-888-MARPOSS or marposs.com


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