Trepanning is performed for
A. Finishing a drilled hole
B. Producing a large hole without drilling
C. Truing a hole for alignment
D. Enlarging a drilled hole
Answer:A
Trepanning is performed for
A. Finishing a drilled hole B. Producing a large hole without drilling C. Truing a hole for alignment D. Enlarging a drilled hole
Explanation: In trepanning, the cutting tool produces a hole by removing a disk-shaped piece (core), usually from flat plates. A hole is produced without reducing all the material removed to chips, as is the case in drilling. Such drills are used in deep-hole drilling machines for making large hollow shafts, long machine tool spindles etc.