Grinding wheel service measures In production grinding, the “tool life” of a grinding wheel is best defined as the time interval between which two recurring maintenance actions?

Introduction / Context:
Unlike single-point tools, grinding wheels consist of many abrasive grains that dull and dislodge. Wheel maintenance restores cutting ability. Understanding the correct measure of a wheel's useful period aids process control.

Given Data / Assumptions:

• Conventional vitrified or resin-bonded wheels.
• Normal shop practice: truing for geometry; dressing for sharpness/open structure.

Concept / Approach:
Dressing exposes fresh, sharp grains and opens clogged pores. The interval between dressings represents the period during which the wheel cuts effectively before glazing or loading reduces performance. Thus wheel “tool life” is commonly the time between dressings under stated conditions.

Step-by-Step Solution:
Identify maintenance types: truing (restore geometry) vs dressing (restore sharpness).Relate cutting ability to dressing frequency.Define wheel tool life as time between successive dressings.

Verification / Alternative check:
Process sheets specify dressing frequency to maintain surface finish and size control; production logs track time or pieces between dressings as a performance metric.

Why Other Options Are Wrong:

• Regrinding (A) and balancing (B) are not routine short-interval actions defining cutting ability.
• 1 mm wear (D) is not a standard universal criterion; wear rate depends on many factors.
• Truing alone (E) restores geometry but not necessarily cutting capacity without dressing.

Common Pitfalls:
Confusing truing with dressing; overdressing leading to excessive wheel consumption; underdressing causing burn and chatter.

Final Answer:
two successive wheel dressings