Q1: What are center drill bits used for? Can I drill deep holes directly with them?
A: Center drill bits are mainly applied to create pilot center indentations to prevent twist drills from wandering off during drilling. They cannot be used for deep-hole drilling directly. They are widely used for machining center holes on shaft workpieces in lathes and serve as pre-positioning tools for machining operations. Our standard center drill bits comply with national and ANSI standards. More specifications are available on our website www.cndrills.com.
Q2: My center drill bits wear out and burn easily when drilling stainless steel and 45# steel. How to fix this?
A: Stainless steel tends to cause work hardening during machining. We recommend reducing spindle speed, applying cutting fluid continuously and avoiding dry cutting. Maintain steady feed pressure instead of forcing the bit. Our center drill bits are made of premium high-speed steel. Coated customized versions are available for mass stainless steel processing to enhance wear resistance and heat resistance.
Q3: What is the difference between Type A and Type B center drill bits? How should I choose?
A: Type A center drill bits have no protective countersink, suitable for regular center hole machining. Type B comes with a protective countersink, creating chamfered center holes to avoid damage during collision. Choose Type B for shaft parts requiring heat treatment and long-term service. Select Type A for simple positioning work. A full range of sizes is in stock for inquiry.
