ABRASIVES
portant because the need to provide porosity for chip removal and coolant fl ow is just as important in dress- ing as it is in part grinding. At the same time, the CVD inserts hold the edge. In effect, the inserts true your wheel and knock the dull abrasives out, and the dia- mond grains come behind and tickle away the bond- ing, opening the wheel. “We fi nd that if you
Meister’s cDD Diamond Dresser is said to be the only dressing wheel in the world that combines radius form accuracy of 2 µm for precise truing with high porosity for excellent wheel sharpening.
compensate for dressing cycles based on those values. But how “precise” is “precise?” Some automotive and aerospace bearing races, high-precision gears, fuel injection armatures and needles, and other components, have form tolerances as tight as 2 µm. That’s why Meister has made major investments to bring
their micro-precision cDD Diamond Dressers to a certifi ed radius form accuracy of two microns, (±1 µm). Northrup says that’s an “order of magnitude improvement in the accuracy and precision for these unique dressers.”
“We fi nd that if you dress your diamond or CBN wheel with a porous dressing tool, you get a sharper wheel.”
Another advantage to Meister’s cDD dressers is that they excel both at truing and sharpening CBN wheels, thanks to a unique structure in which high-quality CVD diamond inserts are strategically embedded within Meister’s hDD porous metal-ceramic hybrid bond. Northrup says this combination gives the roll “the wear characteristics of a metal bond with the porosity of a vitrifi ed wheel. That’s im-
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AdvancedManufacturing.org | November 2016
dress your diamond or CBN wheel with a porous dressing tool, you get a sharper wheel. So not only are you truing the wheel, you’re leaving it in a much better condition to cut. That makes the wheel last
longer, you can improve your cycle time, a whole host of advantages. A typical CVD dresser has a steel or brass body and all that does is rub your wheel.” Furthermore, he says, “these are the only dressers in the world that offer both porosity and this level of accuracy.”
“Conventional” Wheels Still Have a Place
So called “conventional” AlO abrasives are still widely used, because they’re not only much less expensive than superabrasive wheels, they are more capable than they’ve
The CVD inserts in Meister’s cDD dresser reinforce the edge and true the wheel while the diamond grains sharpen the wheel.
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