Grinding.

1

1823.  In the spring of the year, the abrasive effect of the floating ice and trees upon the banks [of the Ohio] is very great.—Geo. W. Ogden, ‘Letters from the West,’ p. 13. (New Bedford).

2

1875.  Ure (‘Dict. of Arts’) speaks of “the abrasive tool or grinder.” (N.E.D.)

3