Question 652General Subjects - Assistant Engineer70% to pass
Which material can be drilled at the highest speed?
AI Explanation
The correct answer is C) Aluminum.
Aluminum can be drilled at the highest speed compared to the other materials listed. This is because aluminum is a relatively soft metal that is easy to machine and drill. It has a lower melting point and lower hardness than the other materials, which allows it to be drilled at higher speeds without overheating or damaging the drill bit.
In contrast, copper, high carbon steel, and medium cast iron are all harder materials that require slower drilling speeds to avoid excessive wear on the drill bit and potential damage to the workpiece.
Related Questions
#650 When drilling holes larger than 1/2 inch, drilling a smaller hole first is a good practice. This is called a pilot hole, and the pilot drill should have a diameter _______________.#651 Which of the listed metals can usually be drilled without lubrication? #653 A tapered shank drill is removed from the drill press spindle with a _______________.#654 Before drilling a hole in a piece of metal, the location of the hole center should be _______________.#655 Failing to decrease the feed pressure on a drill as its point begins to break through the bottom of the work piece will cause the drill to _______________.