A tool-setting blue light special

Thanks to a change in the laser technology employed by a new noncontact measuring system, shop personnel who set miniature tools will stop seeing red.

The NC4+ Blue on-machine tool-setting system is the first of its kind to feature a blue laser, according to West Dundee, Illinois-based Renishaw Inc. The patent pending blue laser technology produces a shorter wavelength than the red laser sources used by conventional noncontact tool setters, reducing diffraction and allowing better control of the laser beam geometry, said Dave Bozich, Renishaw’s machine tool business manager.

“When you don’t have good control of the geometry, you get divergence of the beam as it travels from the transmitter to the receiver,” he said.

Featuring blue laser technology, the NC4+ Blue on-machine tool-setting system accurately measures very small tools. Image courtesy of Renishaw

As a result, the beam increases in diameter and loses energy on the trip to the receiver. In contrast, the blue laser beam, which is 25% to 30% smaller in diameter, retains the diameter and energy that it had exiting the transmitter, he said. This makes NC4+ Blue especially well suited to measure very small tools. These delicate tools can be damaged by contact tool setters. However, he said red laser systems historically have had difficulty measuring the length of tools 0.004″ or less in diameter. That’s not the case with NC4+ Blue. It enables accurate measurement of tools half the size of those that can be accurately measured by conventional red laser systems, Renishaw reports.

In addition, the company states that its blue laser alternative minimizes tool-to-tool measurement errors when machining with a wide range of cutting tools. Consider a situation in which tools in a carousel range from 0.004″ to 0.125″ in diameter. To deal with this range of sizes, Bozich said CNC programmers add “experience values” to software. As the name suggests, these are experienced-based factors meant to increase the accuracy of results when measuring tools with particular diameters. With NC4+ Blue, though, these “fudge factors” aren’t needed, he said.