Choose the correct grinding wheel grain size for soft materials Fill in the blank: A __________ grinding wheel is generally preferred for grinding soft materials to minimize loading and improve cutting action.

Difficulty: Easy

Correct Answer: Coarse grained

Explanation:


Introduction / Context:
Wheel grit size determines chip accommodation and the aggressiveness of cutting points. For soft, ductile work materials, the tendency to smear and clog the wheel must be countered by appropriate grit selection.



Given Data / Assumptions:

  • Soft material (e.g., mild steel, aluminum alloys).
  • Conventional vitrified or resinoid bonds.


Concept / Approach:
Coarse grains create larger chip spaces, reduce wheel loading, and promote a free-cutting action. This is often paired with a softer grade and more open structure to enhance self-sharpening.



Step-by-Step Solution:

Assess work material behavior → ductile, tends to load wheels.Select larger grit size → more chip clearance.Therefore, choose a coarse grained wheel.


Verification / Alternative check:
Shop practice and grinding handbooks recommend coarse grit/open structure for soft metals to avoid glazing.



Why Other Options Are Wrong:
Fine and dense wheels quickly load on soft materials; medium grit may still be inadequate. Extra-hard grades exacerbate glazing rather than prevent it.



Common Pitfalls:
Attempting to improve finish on soft metals with excessively fine grit; finish often worsens due to wheel loading and heat marks.



Final Answer:

Coarse grained

More Questions from Production Engineering

Discussion & Comments

No comments yet. Be the first to comment!
Join Discussion