SCIENCE AND TECHNOLOGY ENGLIAH FOR MECHANICAL ENGINEERING Trial cutting is characterized by its low production efficiency and is not suitable for large volume production However. using this method. the machine tool does not need to be preset in advance. Moreover, the effect of dimensional variation of the blanks(shape, sizes and hardness of the material, etc. can be reduced in machining operations. For these reasons, it has been widely used in traditional small batch production The machining accuracy of the trial cutting method depends mainly upon the minimum possible thickness of the chip removal in the last trial cutting pass and the skill level of the operator. That is the reason why it is easier to attain higher machining accuracy by using a grinding operation than a turning operationSCIENCE AND TECHNOLOGY ENGLISH FOR MECHANICAL ENGINEERING Trial cutting is characterized by its low production efficiency and is not suitable for large volume production. However, using this method, the machine tool does not need to be preset in advance. Moreover, the effect of dimensional variation of the blanks (shape, sizes and hardness of the material, etc.) can be reduced in machining operations. For these reasons, it has been widely used in traditional small￾batch production. The machining accuracy of the trial cutting method depends mainly upon the minimum possible thickness of the chip removal in the last trial cutting pass and the skill level of the operator. That is the reason why it is easier to attain higher machining accuracy by using a grinding operation than a turning operation