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TGS’ dressing wheels are also on linear rails to enhance


precision, according to Giacalone. “Our machines are used to grind aerospace fasteners, which have tight tolerances on the radiuses. To create those radiuses, we dress them into the wheel,” he said. “If my dresser is not accurate, the radius may be incorrect since it goes right into the part. As a result, all our dressers are full CNC and have linear rails and pre- cision ball screws with zero backlash on both axes.” Glebar’s Gleason agreed that linear guideways are a major improvement. “With dovetail ways, when the ram is stationary and you command it to move with a ballscrew, there is always a bit of hesitation [stick/slip] due to the friction between the slides,” said Gleason. “Roller guideways minimize that friction. We also use 0.1 µm glass scales to close the loop on positioning.” CNC control is also enabling innova- tion in centerless grinding. For example, to create a straight-line passage for some parts through the grinding zone in a through-feed unit, or to come to a dead stop in plunge applications, an “hourglass” shape needs to be dressed into the regulating wheel, which is tilted during operation. “Using a manual dresser involves a lot of trial and error,” said Schürl. “Instead, with our CNC control we measure the angle of the reg wheel and the height of the workpiece above center. With these parameters, we calculate the path the dresser must use to create the perfect hourglass shape, which reduces setup time dramatically.”


Automation Nation


To reduce cycle time and need for skilled labor, more manufacturers are automating their centerless grinders with load and unload conveyors, robots and gantry loaders. With the speed at


which modern centerless grinders operate, automation is often a necessity, not an option. For through-feed operations, bowl feeders are used for small to medium-sized parts, and for long, heavy parts, step


Tiger·tec®


Gold


Go for better, go for Gold.


For those who won’t settle for anything but the best: Tiger·tec® Gold.


Gold


If you had to make a choice right now – between maximum tool life, uncompromising process reliability and optimum productivity – which one would you pick? Why not choose the freedom to never have to choose again. Stay true to your own high standards in every way. Choose Tiger·tec®


www.walter-tools.com/us


June 2017 | AdvancedManufacturing.org 55


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