Taylor tool life concept: As cutting speed increases (with other variables fixed), tool life typically __________.

Introduction / Context:
Tool life behavior with speed is central to process planning. The classic Taylor tool life equation captures the inverse relationship between cutting speed and tool life for a given tool-work combination and set of cutting parameters.

Given Data / Assumptions:

• All else constant: feed, depth of cut, tool geometry, coolant usage.
• Defined tool life criterion (e.g., flank wear land width).
• Steady turning or similar machining process.

Concept / Approach:
Taylor relationship: V * T^n = C, where V is cutting speed, T is tool life, n and C are empirical constants. Holding C and n fixed, an increase in V must be offset by a decrease in T, i.e., tool life falls as cutting speed rises.

Step-by-Step Solution:

Verification / Alternative check:
Plotting log V vs. log T gives a straight line with negative slope (−n), confirming the inverse relationship across tested conditions.

Why Other Options Are Wrong:
Increases/Remains constant: contradicts Taylor’s well-established empirical law.First increases then decreases: not typical for fixed conditions; anomalies usually stem from changing wear mechanisms or cooling.

Common Pitfalls:
Ignoring that feed and depth also affect life; assuming the same constants apply when changing tool materials or coatings.

Final Answer:

decreases