Revolving Centres are Frictionless. Used for supporting heavy jobs and jobs revolving with high speeds. A high-speed steel inserted centre is supported by two bearings housed in a body. It is also called the revolving dead centre.
3) Which one of the following centres is suitable when workpiece held between centres is to be turned at high speed ?
Answer is:
Revolving centre
Explanation:
Related Lathe Accessories MCQ - Turner (Set-1) with Answers
Answer is:
60 Degree
Explanation:
The centre, which is accommodated in the main spindle sleeve, is known as a ‘live centre’ and the centre fixed in the tailstock spindle is known as a dead centre. In construction, both centres are identical, made as one unit that consists of a conical point of 60° included angle, a body provided with a Morse taper shank and a tang.
Answer is:
To face the workpiece up to the end of the centre hole
Explanation:
Though it is termed as half centre, little less than half is relieved at the tip portion. Used while facing the job without disturbing the setting.
Answer is:
More friction
Explanation:
The dead centre is made out of high carbon steel, hardened and ground whereas the live centre need not have its conical tip hardened as it revolves with the work. A good lubricant should be used for the dead centre.
Answer is:
The diameter of the body of the chuck
Explanation:
The size of three-jaw chuck is specified by the diameter of the body of the chuck
