Coated abrasive disc and methods of making and using the same

A method of making a coated abrasive disc, the method comprising:

• disposing a curable make layer precursor on a major surface of a disc backing;
• embedding abrasive elements into the curable make layer precursor,
• wherein the abrasive elements are disposed adjacent to contiguous intersections of a horizontal and vertical lines of a rectangular grid pattern, wherein at least 70 percent of the intersections have one of the abrasive elements disposed thereat,
• wherein each of the abrasive elements has two triangular abrasive platelets, wherein each of the triangular abrasive platelets has respective top and bottom surfaces connected to each other, and separated by, three sidewalls, wherein, on a respective basis, one sidewall of at least 90 percent of the triangular abrasive platelets is disposed facing and proximate to the disc backing,
• wherein a first portion of the abrasive elements is arranged in alternating first rows wherein the triangular abrasive platelets in the first row are disposed lengthwise aligned within 10 degrees of the vertical lines, wherein a second portion of the abrasive elements is arranged in alternating second rows wherein the triangular abrasive platelets in the second row are disposed lengthwise aligned within 10 degrees of the horizontal lines, and
• wherein the first and second rows repeatedly alternate along the vertical lines,
• at least partially curing the curable make layer precursor to provide a make layer;
• disposing a curable size layer precursor over the at least partially cured make layer precursor and triangular abrasive platelets;
• and
• at least partially curing the curable size layer precursor to provide a size layer.