In many such situations the best approach is to com- bine laser scanning with another technique. Steve Kers- en, VP of sales and marketing for NVision (Southlake, TX) said, “Laser is often used to scan an entire part because it’s quick and gives engineers a fast way to make a 3D model. One of our bigger units scans with a 9" [228.6- mm] stripe. You can capture many parts very, very quick- ly. We may then go back and touch-probe certain por- tions that need to be accurate within tenths, and adjust the model accordingly.”


“Laser is often used to scan an entire part because it’s quick and gives engineers a fast way to make a 3D model.”


Strand echoes this, explaining that, “A surface profi le


typically doesn’t have the same tolerance as a datum or a feature, so we’d typically use a laser to create a point


cloud of the entire object and then use another method to measure specifi c areas like a hole, a bore, a planer face, or a turbine blade’s root form.”


Accurate to Within a Tenth...or Maybe Not... That’s not to say that laser scanning isn’t accurate. Kersen said, “A good laser in a bridge-type CMM will be accurate into the tenths. A portable system in which the laser is mounted to an articulating arm in a movable CMM can be accurate to plus or minus a thou. So the quality of the laser and the method for orienting the laser are both critical factors.”


Kersen cautioned that, “There are some cheap $10,000 lasers coming out of Russia now that aren’t very accurate. Price tends to determine the accuracy. These systems are not very accurate while some of the better laser systems we and others sell cost over $100,000.” There are also systems that use laser-tracking tech- nology to accurately locate a hand-held probe in space,


Machining of perfect cutting edges, cylindrical margins and chip breakers in ultra hard materials such as PCD, CBN, CVD, MCD and natural diamond. Precise and reliable LaserSmart 500.


The smart choice.


www.rollomaticusa.com solutions@rollomaticusa.com www.rollomaticusa.com solutions@rollomaticusa.com See us at EASTEC Booth #1706 AdvancedManufacturing.org LF21


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