Grinding wheel grade selection The grade (hardness) of a grinding wheel should be chosen considering which of the following factors?

Introduction / Context:
Wheel grade indicates how strongly the bond holds abrasive grains. Selecting the correct grade controls self-sharpening behavior, heat generation, and surface quality. An inappropriate grade leads to glazing, burn, or rapid wheel wear.

Given Data / Assumptions:

• Conventional surface/cylindrical grinding with Al2O3 or SiC wheels.
• Work materials vary from soft to hard, ductile to brittle.
• Machine stiffness and speed conditions differ.

Concept / Approach:
Hard work materials usually call for a softer wheel grade to expose fresh sharp grains. Higher speeds or light cuts often pair with softer grades to avoid glazing. On flexible machines, a softer grade helps prevent chatter by limiting rubbing and heat buildup. Thus, multiple factors must be weighed together.

Step-by-Step Solution:

Verification / Alternative check:
Manufacturer selection charts correlate grade with work hardness, speed, feed, and machine power/rigidity.

Why Other Options Are Wrong:
Focusing on only one parameter ignores interactions; tool–work dynamics are multivariate.

Common Pitfalls:
Selecting a hard grade for hard steels causes glazing and burn; selecting too soft a grade for robust setups leads to rapid wear and loss of form.

Final Answer:

All of these