Question

Tricone roller bit is used with

• A. down-the-hole hammer.
• B. Jack hammer.
• C. rotary-percussive drill.
• D. rotary drill.

Hint:

Tricone bits always require continuous rotation and are never used in percussive drilling systems.

Answer 1

The Correct Option is D

Tricone roller bits are designed for crushing the formation using rotational motion.

Step 1: These bits have three rotating cones that grind the rock by rolling and crushing. They require continuous rotary motion.

Step 2: Percussive tools like DTH hammers and jack hammers use impact, not rotation, so they cannot use tricone bits. Rotary-percussive drills also rely partly on percussive energy.

Step 3: Only a pure rotary drill provides the required motion for efficient tricone bit operation.
Thus, tricone roller bits are used with a rotary drill.