The operation of smoothing and squaring the surface around a hole is known as
A. Counter-sinking
B. Counter-boring
C. Trepanning
D. Spot facing
Answer: Option D
Solution(By Examveda Team)
The most common application of spot facing (spot facing) is facing the area around a bolt hole where the bolt's head will sit, which is often done by cutting a shallow counter bore, just deep enough "to clean up"—that is, only enough material is removed to get down past any irregularity and thus make the surface flat.This Question Belongs to Mechanical Engineering >> Manufacturing And Production Technology
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trepanning is the operation of produce large hole without drilling
counter boring is to make head of nut square type
counter sinking make head of nut cone type