Cast iron does not require any coolant during reaming because, graphite in the cast iron acts as a lubricant.
12) Which one of the following metals does not require any coolant during reaming ?
Related Cutting Tools MCQ - Machinist(Set-1) with Answers
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.
For tapping copper or aluminium Kerosene is used as coolant.