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It is required to cut screw threads of 2 mm pitch on a lathe. The lead screw has a pitch of 6 mm. If the spindle speed is 60 r.p.m., then the speed of lead screw will be

A. 10 r.p.m.

B. 20 r.p.m.

C. 120 r.p.m.

D. 180 r.p.m.

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  5. Cutting fluids are used to
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  8. An open structure of a grinding wheel is used for
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  13. The snag grinding is done
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  18. Side rake angle of a single point cutting tool is the angle
  19. The cutting speed is minimum while machining _________ with a high speed steel tool.
  20. A feed gear box for a screw cutting lathe is designed on the basis of
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  26. The trade name of a nonferrous cast alloy composed of cobalt, chromium and tungsten is called
  27. The vector sum of cutting velocity and chip velocity is __________ shear velocity.
  28. An important geometrical quantity in the cutting of metals which can be used as a criterion for machinability…
  29. A type of welding flows, which is the result of a perfect proportion and mixture of acetylene and oxygen…
  30. The operation of machining several surfaces of a workpiece simultaneously is called