PRODUCT APPLICATION:

• The ideal tool for sheet metal working in the following sectors of industries: electrical sanitary engineering and heating technics or automotive, mechanical engineering, aviation and switching systems up to 2mm sheet thickness.
• This tough tool is suitable for all standard industrial materials: nonferrous metal, special steel, thermoplastics and duroplastics as well as sheet metals up to 4mm thickness.
• This durable and versatile tool will center, spot-drill, bore and debur - all in one smooth, high performance working cycle.

PRODUCT INFORMATION:

The Flutes of step drills are CBN ground from the solid hardened form. Because CBN (Cubical Boron Nitride) is a much harder abrasive than even silicium carbide or corundum, a better and shaper cutting edge is achieved - without burrs. And, with higher dimensional precision the drills will last considerably longer while maintaining the precise process tolerances.

• CBN ground flutes enable very sharp and burr-free cutting edges compared to the ordinary milled flutes. Especially the chip flow is optimized, so even long, non-breaking chips will be removed easily. The optimized chip flow protects the cutting edges and reduces built-up edges and cold weld marks. Due to these special features, cutting performance and tool life are extended significantly.
  
• Each step has a radially adjusted relief produced by CBN grinding that relates directly to the diameter of the step. This means the cutting edge is always the highest point of the diameter.
  
• Each step is axially CBN relief ground. This means the cutting edge is always the highest point of the axial cutting axis.
  
• The cutting edge of each step has relief angle. This means the cutting edge is also the highest point in advance direction.
  
• The CBN ground bit ensures centering and spot-drilling even in thin-walled material.

THE DOWN SIDE

1) Step drills are very expensive to produce initially and unnecessarily complex.
2) Lead times are long, therefore usually requiring excessive "back-up" inventory.
3) When they are resharpened, all the diameters must be "pushed back" to maintain step relationships.
4) Resharpening can be very expensive because all diameters must be ground even if only one Dia. Is dull.
5) If one diameter is severely chipped or broken the whole drill is junk.
6) Performance and uniformity are always compromised (speeds and feeds), effecting job performance and cycle times.
7) Due to the nature of step drill configurations, every time it's reground a new set of problems must be addressed.
8) Chip evacuation is always an issue because the next step is usually in the way, as is the flute gash transition from one step to another.
9) Effective coolant thru all diameters is almost impossible, if possible at all.