Multiple choice

The figure shows an incomplete schematic of a conventional lathe to be used for cutting threads with, different pitches. The speed gear box Ur is shown and the feed gear box Us is to be placed P, Q, R and S denote locations and have no other significance. Change in Ur should NOT affect the pitch of the thread being cut and changes in Us should NOT affect the cutting speed.

The correct connections and the correct placement of Us are given by

  1. Q and E are connected, Us is placed between P and Q

  2. S and E are connected, Us is placed between R and S

  3. Q and E are connected, Us is placed between Q and E

  4. S and E are connected, Us is placed between S and E
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The feed drive serves to transmit power from the spindle to the second operative unit of the lathe, that is, the carriage.It, thereby converts the rotary motion of the spindle into linear motion of the carriage. So, Q and E are connected & $U_s$ is placed Q and E.

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