A reamer is a multi-point cutting tool used for enlarging by finishing previously drilled holes to accurate sizes.
11) A cutting tool used to finish and enlarge a hole is known as
Related Cutting Tools MCQ - Machinist(Set-1) with Answers
Cast iron does not require any coolant during reaming because, graphite in the cast iron acts as a lubricant.
Threading dies are used to cut external threads on cylindrical work-pieces.
The die nut is used for chasing or reconditioning the damaged threads.
Die nuts are not to be used for cutting new threads. The die nuts are available for different standards and sizes of threads. The die nut is turned with a spanner.
Tap extractor can be used for removing a broken tap.