A standard countersink (without unequal spacing) will often lead to uneven running during countersinking. The tool begins to chatter, leading to uneven load on the cutting edges. The torsion moment increases considerably, resulting in substantial load peaks at the cutting edges. The result, apart from corrugated surfaces or lack of concentricity when countersinking, is a significant reduction in tool life.
The new GARANT high-precision countersink (countersink set No. 15 0305 - available from 1st August 2015) solves this problem. The extremely uneven spacing excludes the possibility of tool chatter. This results in equal and greatly reduced loads on each cutting edge. Tool life is increased significantly and perfect surfaces are achieved.