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101.

A workpiece of 2000mm length and 300mm width was machined by a planning operation with the feed set at 0.3mm/stroke. If the machine tool executes 10 double strokes/min, the planning time for a single pass will be

Answer»

A workpiece of 2000mm length and 300mm width was machined by a planning operation with the feed set at 0.3mm/stroke. If the machine tool executes 10 double strokes/min, the planning time for a single pass will be
Discussion
102.

For tool A, Talor's tool life exponent (n) is 0.45 and constant (K) is 90. Similarly for tools B, n=0.3 and K=60. The cutting speed (in m/min) above which tool A will have a higher tool life than tool B is

Answer»

For tool A, Talor's tool life exponent (n) is 0.45 and constant (K) is 90. Similarly for tools B, n=0.3 and K=60. The cutting speed (in m/min) above which tool A will have a higher tool life than tool B is
Discussion
103.

During turning a carbon steel rod of 150 mm diameter by a carbide tool of geometry, 0, 0, 10, 9, 16, 75, 0 (mm) at speed of 400 rpm, feed of 0.32 mm/rev. Tangential component and feed force which is the component of the thrust force are 1200 N and 1000 N respectively, friction force acting at the chip tool interface is _______ N. 1035.27

Answer» During turning a carbon steel rod of 150 mm diameter by a carbide tool of geometry, 0, 0, 10, 9, 16, 75, 0 (mm) at speed of 400 rpm, feed of 0.32 mm/rev. Tangential component and feed force which is the component of the thrust force are 1200 N and 1000 N respectively, friction force acting at the chip tool interface is _______ N.


  1. 1035.27
Discussion
104.

If the Taylor's tool life exponent n is 0.4 and the tooling cost is ₹50 per replacement, machining cost is ₹7 per min. If number of replacement by operator is given by 2. The optimum tool life for minimum cost is ________min. 10

Answer» If the Taylor's tool life exponent n is 0.4 and the tooling cost is ₹50 per replacement, machining cost is ₹7 per min. If number of replacement by operator is given by 2. The optimum tool life for minimum cost is ________min.
  1. 10
Discussion
105.

In ASA system, the side cutting and end cutting edge angles of a sharp turning tool are 45o and 10o, respectively. The feed during cylindrical turining is 0.1mm/rev. The centre line average surface roughness (in mum, round off to one decimal place) of the generated surface is______.3.75

Answer» In ASA system, the side cutting and end cutting edge angles of a sharp turning tool are 45o and 10o, respectively. The feed during cylindrical turining is 0.1mm/rev. The centre line average surface roughness (in mum, round off to one decimal place) of the generated surface is______.
  1. 3.75
Discussion