Consider the following statements
The set – up for internal centreless grinding consists of a regulating wheel a pressure roll and a
support roll between which the tubular work piece is supported with the grinding wheel within
the tube wherein
1. The grinding wheel work piece and regulating wheel centers must line on one line
2. The directions of rotation of work piece and grinding wheel are same
3. The directions of rotation of pressure roll support roll and regulating wheel are same
4. The directions of rotation of grinding wheel and regulating wheel are same
Which of these statements are correct?
(a) 1, 2 and 3 (b) 1, 3 and 4 (c) 2 and 3 (d) 3 and 4