Abrasive Machining

Grinding process is mainly used to

• Finishing

• Shouldering

• Knurling

• Centering

 Smaller grain size in a grinding wheel tends to

• degrade surface finish

• have no effect on surface finish

• improve surface finish

• None of above

 Which of the following would tend to give higher material removal rates?

•  larger grain size

• smaller grain size

Hard grade wheels are recommended for

•  Hard materials

• Soft materials

• Either Hard materials or Soft materials

• None

 Which one of the following abrasive processes achieves the best surface finish?

• centerless grinding

• honing

• lapping

• superfinishing

  External cylindrical grinding is used for grinding______________.

•  External cylindrical surfaces

• Internal cylindrical surfaces

• Both External & Internal cylindrical

• None of above

 Surface grinding are used to produces_________.

• Profile surfaces 

• Curve surface 

• Flat surfaces 

• None

 The method of grinding used to produce internal cylindrical holes and tapers is

•  internal cylindrical grinding

• form grinding

• external cylindrical grinding

• surface grinding

 Honing is mostly used for finishing

• Internal cylindrical surfaces

• Outer cylinder surfaces

• Both (A) and (B)

• None of the above

Explain the difference of the process of external cylindrical grinding and internal cylindrical grinding with schematic diagram.

Answer explanation

External grinding

There are two types of feed motion possible

(a) traverse feed - grinding wheel is fed in a direction parallel to the axis of rotation of the workpart

(b)plunge-cut - the grinding wheel is fed radially into the work

The various grinding methods include straight cylindrical, taper, end face, and total shape grinding.

Internal Grinding

The workpiece is fixed and the inner surface of the workpiece is machined with the rotating axle wheel.

Grinding may sometimes be performed by rotating the workpiece.