Holes
in parts which have been hardened by heat treatment can be finished to accurate
size only by:
Drilling
Boring
Internal grinding
Reaming
Internal grinding
●Internal
grinding is used to grind the internal surface of a work-piece.
●Drilling
is done for making holes in work-piece.
●Bore
is done to enlarge the drilled holes.
●Reaming
surface finishing process inside a hole.
Hence,
the correct option is (C)
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