We want to operate a lathe to cut a 4-in.-diameter piece of mild steel (BHN of 1

Question

We want to operate a lathe to cut a 4-in.-diameter piece of mild steel (BHN of 120) at 200 rpm. The depth of cut will be 0.05 in. and the feed rate will be 60 threads per inch. What horsepower will be needed at the tool? We want to cut a piece of pipe to be welded to a steel plate. List three methods by which the pipe could be cut. Which would be the best method? Why? What cutting tool material would be best suited for mass production of aluminum parts? Why? At what rpm should a drill press be set to drill a 0.25-in. hole in a piece of stainless steel? Work from Table 4-2. Would a carbide-tipped cutting tool be a wise choice for cutting a piece of copper? Defend your .answer. You have available a power hacksaw, a vertical milling machine, and a grinder to remove 0.25 in. of material. Under what conditions would each be a good choice of tool?

Explanation / Answer

10.

For removing .25 inches of material from the flat surface,when it is in form of a irregularity on the flat surface,a grinder with a small disc is a good choice.

A power hacksaw has large blades and thereby has a greater Material Removal Rate and results in poor surface finish and so it is used when the .25 inches of material needs to cut from a large section as it cuts through the metal.

A Vertical Milling Machine is used for making gears and also for slotting operations. It may be used when a .25 inch slot needs to be cut.

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