Which one of the following cutting tools cannot be used on a turret lathe: (a) broach, (b) cutoff tool, (c) drill bit, (cl) single-point turning tool, or (e) threading tool?
The correct answer and explanation is:
The correct answer is (a) broach.
Explanation:
A turret lathe is a versatile machine tool used in metalworking to perform various operations such as turning, drilling, threading, and parting. It allows for multiple cutting tools to be mounted and used in sequence without manually changing tools, which enhances efficiency in production.
Why a Broach Cannot Be Used:
- Definition of Broaching: A broach is a cutting tool used to remove material through a linear motion. It is primarily used for machining keyways, splines, or specific shapes in holes or on surfaces. Broaching requires a specific machine—called a broaching machine—that is designed to handle the linear cutting force and feed required for this operation.
- Motion Incompatibility: The turret lathe operates based on rotary and axial motions, which are not suitable for the linear motion required by broaching. The structural design and functionality of turret lathes are not equipped to support the forces and mechanics involved in broaching.
- Tool Mounting: Turret lathes are designed to accommodate tools like cutoff tools, drill bits, single-point turning tools, and threading tools, which perform their respective operations within the machine’s rotary motion framework. Broaches, being long and requiring a specific guiding mechanism, cannot be effectively mounted or used on a turret lathe.
Tools That Are Compatible:
- Cutoff Tool: Used to separate finished parts from raw stock.
- Drill Bit: Commonly used for creating holes.
- Single-Point Turning Tool: For general turning operations.
- Threading Tool: For cutting threads on cylindrical parts.
In summary, while a turret lathe is highly adaptable, it cannot accommodate a broach due to the fundamental differences in motion and machine design. Specialized broaching machines are required for broaching operations.