Turning forces: The thrust (feed) force generally increases with an increase in which parameter, all else being equal?

Introduction / Context:
In orthogonal and oblique cutting, the cutting force components (tangential, radial, and feed/thrust) depend on geometry and cutting conditions. Understanding how tool nose radius affects thrust helps balance surface finish against loading.

Given Data / Assumptions:

• Turning with a single-point tool at fixed speed, feed, and depth of cut.
• Only one geometry variable is changed at a time.
• Work and tool materials remain constant.

Concept / Approach:
Increasing nose radius increases the contact length between tool and work and enlarges the ploughing zone at small feeds. This raises the radial and thrust components even as it can improve surface finish and edge strength. In contrast, increasing positive rake generally reduces forces; changes to side/end cutting edge angles have subtler, directional effects.

Step-by-Step Solution:

Verification / Alternative check:
Force dynamometer data commonly show feed/thrust rising with nose radius at low to moderate feeds due to increased edge contact and burnishing.

Why Other Options Are Wrong:
Side/End cutting edge angles: influence chip flow direction and distribution but do not consistently raise thrust as nose radius does.Rake angle: a higher positive rake typically lowers all force components.

Common Pitfalls:
Using an excessively large nose radius at light feeds can cause chatter due to higher radial forces; always match radius to feed and rigidity.

Final Answer:

Tool nose radius