a Machining ductile material results in a good surface finish c. Mater d. Good t

Question

a Machining ductile material results in a good surface finish c. Mater d. Good therma Material with high fracture toughness tends to generate long chips that are hard to break rials that react chemically with tool at high temperature could accelerate tool wear I conductivity will not affect the temperature on the tool surface 8) Which ones of these are NOT correct when evaluating material machinability? machinability? Which ones of these are NOT correct to describe material a. Machinability is the relative susceptibility of a material to the machining process b. The chemical makeup and metallurgical qualities of a material do NOT affect machinability C Amaterial with good machinability by one criterion must have good machinability by another 9) d. NOT all materials are equally machinable. 10) Ceramic tools offer two advantages over carbides and High Speed Steel tools:--and a. faster materials removal rate b. high tip accuracy c longer tool life d. high thermal shock resistance M. Fill Blanks and Connection (5x4 20) Moune. keyhoard CAD databae Display Fig. 1. CAD architecture. 1) Please fill blanks in Fig. 1 2) Pleas ill blanks in the following table to denote different geometric tolerance symbols. Profile line Perpendicularity Angularity Cylindricity Runout Total runout

Explanation / Answer

8) Ans:- “Good thermal conductivity will not affect the temperature on the tool surface” is NOT correct. BECAUSE GOOD THERMAL CONDUCTIVITY OF THE TOOL MATERIAL HELPS IS DISSIPATING THE HEAT FROM THE TOOL SURFACE AND INCREASE TOOL LIFE.

9) Ans:-“A material with good machinability by one criterion must have good machinability with another” is NOT correct. BECAUSE WHEN THE MATERIAL REMOVAL OPERATION CHANGES ALL CONDITIONS ALSO CHANGE FOR E.G. CUTTING FORCES IN MAGNITUDE AND DIRECTION.

10) Ans:- a) Higher machining rate(because higher cutting speeds are possible)

b) Longer tool life(3 to 10 times longer than plain carbide tool)

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