The "Raster" method is not new. As other people in this thread have responded it involves using your computerized engraving system with a special cutter and a Braille font to drill holes in the sign substrate. Accent Signage offers the package, including the "Raster balls" in various colors and materials.
The Engravers Journal published an article on the topic in May '02, which showed both the manual and automatic method of applying the beads. More importantly, our March issue which is being mailed now, contains an updated article on the ADA, including discussion about the raised letters, Braille, and the new ADA regulations. The ADA regulations changed in 2004 and a number of people are not aware of the new ANSI standard.
As a matter of possible interest we published an article in October 04 discussing doing Braille signs using a laser engraving system. This is similar in concept to the "Raster" method, except you are using the laser to vector cut the Braille dot holes in a 1/32" substrate, then inserting the beads.
Enjoy!
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