Difficulty: Easy
Correct Answer: 1500 to 2000
Explanation:
Introduction / Context:
Grinding wheel surface speed is critical for cutting action, wheel wear, and safety. Manufacturers specify safe and effective ranges depending on bond type and wheel composition.
Given Data / Assumptions:
Concept / Approach:
Shop-standard practice often targets roughly 30–35 m/s (about 1800–2100 m/min). Many wheels operate reliably around 1500–2000 m/min. Higher speeds demand special bonds/machines; lower speeds reduce grinding efficiency.
Step-by-Step Solution:
Convert common practice: 30 m/s ≈ 1800 m/min.Select the option spanning the typical zone: 1500–2000 m/min.
Verification / Alternative check:
Machine nameplates and wheel blotter limits confirm safe maximum speed; job cards often specify ~1800 m/min for standard wheels.
Why Other Options Are Wrong:
500–1500 m/min is generally low for efficient stock removal; 2000–2500 m/min and above may exceed limits for many vitrified wheels and require special setups.
Common Pitfalls:
Ignoring wheel blotter maximum RPM and bursting risk; not recalculating surface speed after changing wheel diameter.
Final Answer:
1500 to 2000
Discussion & Comments