Regulating wheel inclination in centreless grinding In through-feed centreless grinding, the regulating (control) wheel axis is set at a small inclination to the workpiece axis to impart feed. What is the typical angle range used?

Difficulty: Easy

Correct Answer: 0° to 8°

Explanation:


Introduction / Context:
Centreless grinding achieves high production rates by supporting the work between a grinding wheel and a regulating (control) wheel without centers. The regulating wheel speed and inclination govern the through-feed rate and work stability.



Given Data / Assumptions:

  • Process is through-feed centreless grinding.
  • Work is supported on a work-rest blade between the two wheels.
  • Small axial feed is produced by tilting the regulating wheel axis.


Concept / Approach:
Tilting the regulating wheel by a small angle α relative to the grinding wheel axis creates a component of the regulating wheel surface velocity along the work axis. This component feeds the work through the machine. Typical α is a few degrees; excessive angles can destabilize the work and degrade roundness or surface finish.



Step-by-Step Solution:
Define α as the inclination of the regulating wheel axis to the work axis.Recognize standard practice: α kept small to control feed smoothly.Typical range used industrially: about 2° to 8°, hence the best matching choice is 0° to 8°.



Verification / Alternative check:
Setup manuals specify low single-digit degrees for the regulating wheel angle to balance feed with roundness control.



Why Other Options Are Wrong:
Higher ranges (9°–15° or more) are atypical and can cause instability, poor finish, or loss of control. Very large angles are not used for through-feed centreless grinding.



Common Pitfalls:
Confusing the regulating wheel tilt with work-rest blade angle or height; both affect roundness but serve different purposes.



Final Answer:
0° to 8°


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