A machinist is required to finish a hole in a hard alloy component. Which reamer material should be selected?
Carbide
Finishing a hole in a hard alloy component demands a reamer that stays sharp and holds its diameter while cutting a very hard material. The governing rule for tooling is that the tool must be substantially harder and more wear-resistant than the work.
Carbide keeps its hardness and cutting edge even at the elevated temperatures generated in the cut, and resists abrasive wear far better than ordinary metals, so a carbide reamer can size a hard alloy hole accurately and repeatably.
Copper is a soft, ductile metal used for electrical and heat-conducting parts; as a reamer it would deform and blunt instantly against a hard alloy.
Mild steel is low-carbon and soft, unable to hold a cutting edge on hard material, so it would wear away rather than cut.
Brass is a soft copper-zinc alloy chosen for machinability and corrosion resistance, not hardness, so it too cannot ream a hard component.
Since only carbide is harder than the workpiece and retains its edge, it is the correct reamer material for a hard alloy.
Hence, the answer is Carbide.
Similar Questions
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Important Questions from Drilling and Reaming
What is the point angle of the drill used to drill copper?
The clearance angle of a drill is between ______.
What is range of drills provided on a Morse taper?
Which of the following formulas is used to calculate rpm where cutting speed and diameter are known?
The Morse standard taper is available in _______ numbers.
