Machinists aren’t likely surprised by the fact that the tool used in the long-reach application depicted in the video above features button-style inserts (courtesy of Ingersoll Cutting Tools, the video showcases the Form master R). Look a bit closer, however, and you’ll notice that those double-sided inserts aren’t perfectly round. Rather, the cutting edges are serrated. Employed correctly, a toothed edge can add to the strength and stability that have made button inserts so popular for heavy roughing. This January-issue article provides more information.