Metal Cutting Part 2

 Which of the following are characteristics of the orthogonal cutting model (three best answers):

• a circular cutting edge is used

• he cutting edge is perpendicular to the direction of cutting speed

• the two elements of tool geometry are rake and relief angle

• only two dimensions play an active role in the analysis

• the cutting edge is parallel to the direction of cutting speed

Given that tc = chip thickness after the cut, to = chip thickness before the cut, f = feed, d = depth, and w = width of cut,  the chip thickness ratio is which one of the following?

• tc/to

• to/tc

• f/d

• to/w

 Which one of the four types of chip would be expected in a turning operation conducted at low cutting speed on a brittle work material:

• continuous

• continuous with built-up edge

• discontinuous

• serrated

 Of the following cutting conditions, which one has the greatest effect on tool wear?

• cutting speed

• depth of cut

• feed

• None of above

In how many groups, metal removal process can be classified?

• 2

• 3

• 4

• 5

Answer explanation

Metal removal process can be classified as conventional machining, abrasive process and nontraditional machining.

 In which type of metal removal process, grinding is included?

• conventional machining

• abrasive process

• nontraditional machining

• none of the mentioned

Answer explanation

As per the classification of metal removal process, it is included in abrasive process. When we remove metal with the help of single or multiple abrasive particle, the process is called abrasive process.

 Which of the following is the type of nontraditional machining?

• turning

• drilling

• milling

• none of the mentioned

Answer explanation

Turning, drilling and milling are the types of nontraditional machining. Drilling means make a hole by using drilling machine and milling machine is a machine tool that removes metal as the work is fed against multipoint cutter. Turning is basic operation generally carried out on lathe machine.

 In which process, various energy forms other than sharp cutting tool is used to remove materials?

• conventional machining

• abrasive process

• nontraditional machining

• none

Answer explanation

It can be understood from the definition of nontraditional machining. Non-traditional machining is an operation which do not use shear as their primary sources of energy.

Are coolant and lubricant same?

 

• Yes

• No

• Not sure

Answer explanation

Cutting fluid serves two purposes- one is cooling and another is lubricating. When the cutting fluid is used to take away the heat generated in the workzone during the machining operation, it is termed as coolant. When the cutting fluid is used to reduce the co efficient of friction between the cutter surface and chip, it is termed as lubricant.

 Cutting fluids are used to:

• cool the tool

• improve surface finish

• cool the workpiece

• all of the mentioned

Answer explanation

Functions of cutting fluids are
a) to cool the cutting tool and the workpiece
b) to lubricate the chip, tool and workpiece
c) to help carry away the chips
d) to lubricate some of the moving parts of the machine tool
e) to improve the surface finish
f) to prevent the formation of built up ridge
g) to protect the work against rusting