Question

_______ is the cutting action of thousands of sharp abrasive grains.
1. Grinding
2. Milling
3. Broaching
4. Drilling

Answer 1

Correct Answer - Option 1 : Grinding

Concept:

Grinding:

• Grinding is an abrasive machining process that uses a grinding wheel as the cutting tool.
• The cutting tool having thousands of abrasive grain particles of negative rake angle.
• Grinding is used to finish workpieces that must show high surface quality and high accuracy of shape and dimension.
• The accuracy in dimensions in grinding is of the order of 0.000025 mm.
• According to the accuracy of the work to be done on a grinding machine, they are classified as Rough grinding machines and precision grinding machines.
• For grinding a job, the right grinding wheel is to be selected. The selection of a grinding wheel will depend on the following factor:
  • Material to be ground
  • Amount of stock to be removed
  • Area of contact
  • Finish required
  • Wheel speed
  • Work speed

Milling 

• Milling is a process of producing flat and complex shapes with the use of a multi-point (or multi-tooth) cutting tool.
• The axis of rotation of the cutting tool is perpendicular to the direction of feed, either parallel or perpendicular to the machined surface.

Broaching:

• Broaching is a machining process for the removal of a layer of material of desired width and depth usually in one stroke by a slender rod or bar type cutter having a series of cutting edges with gradually increased protrusion.

Drilling

• Drilling is a cutting process that uses a drill bit to cut or enlarge a hole of circular cross-section in solid materials.
• The drill bit is a rotary cutting tool.