Manufacturing And Production Technology
The main purpose of spheroidising treatment is to improve

Machinability of high carbon steels
Hardenability of low carbon steels
Machinability of low carbon steels
Hardenability of high carbon steels

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Manufacturing And Production Technology
In ultrasonic machining, the metal is removed by

Maintaining an electrolyte between the work and tool in a very small gap between the two
Erosion caused by rapidly recurring spark discharges between the tool and work
Direct contact of tool with the work
Using abrasive slurry between the tool and work

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Manufacturing And Production Technology
Jigs are used

For holding and guiding the tool in drilling, reaming or tapping operations
None of these
To check the accuracy of workpiece
For holding the work in milling, grinding, planing or turning operations

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