Deep-hole drilling practice In which drilling setup is the workpiece usually rotated while the drill is fed longitudinally into the work to maintain straightness and reduce wander?

Introduction / Context:
Drilling long, small-diameter holes is challenging due to tool deflection and chip evacuation. Deep-hole drilling (including gun drilling and BTA systems) uses special kinematics and coolant delivery to maintain straightness and prevent drift.

Given Data / Assumptions:

• Hole length to diameter ratio is high (deep hole).
• Straightness and drift control are critical.
• Coolant is delivered at high pressure through the tool or tooling system.

Concept / Approach:
In deep-hole drilling machines, it is common to rotate the workpiece (sometimes counter-rotate tool and work) while feeding the drill. This averaging effect reduces runout and directional error. Standard drilling machines usually rotate the tool while the work is stationary.

Step-by-Step Solution:
Identify process needing exceptional straightness: deep-hole drilling.Recognize the kinematic strategy: rotate work (and sometimes tool) to reduce lateral forces.Select the machine type built for this: deep hole drilling machine.

Verification / Alternative check:
Gun-drill catalogs and process notes specify work rotation to minimize hole curvature and improve roundness in long bores.

Why Other Options Are Wrong:
Sensitive, radial, and gang drills normally rotate the tool with stationary work. They are not optimized for very high L/D ratios.

Common Pitfalls:
Assuming conventional kinematics are sufficient for deep holes; neglecting chip evacuation and coolant-induced stability.

Final Answer:
Deep hole drilling machine