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Machining with high-speed drills

Carbide drills have largely replaced high-speed steel (HSS) drills in the industry. Before 2000, the market share of cemented carbide and high-speed steel drills was about 50-50. The market share of HSS is slowly shrinking, and today it accounts for about 10% to 15% of all drill bit purchases. However, HSS drills are still making millions of holes.
HSS drills are more ductile and less hard than carbide drills Carbide options have the potential to break in some cases, especially when operators using hand drills start to fatigue, while HSS Options will withstand this flex better. The ability to bend has been a great advantage in unstable conditions, older machines with bad spindle runouts, loose slides or fixtures, and many other situations.
When HSS bits first hit the market, they usually had a chisel point. Instead of turning very fast, the center of the drill bit pushes and squeezes the material until the edge can cut through it. Typically, HSS bits have a 118-degree angle at the point, although many manufacturers have introduced bits with 135- and 140-degree angles in recent years.
The 135-degree bit is flatter than the 118-degree option, allowing the cutting lip to make contact with the material more quickly and start the all-metal cutting action quickly. However, the 118-degree option remains standard. These characteristics contribute to longer tool life as HSS drills tend to spend less time in cut due to the soft material.
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