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The figure shows the incomplete schematic of a conventional lathe to be used for cutting threads with different pitches. The speed gear box Uv is shown and the feed gear box Us is to be placed. P, Q, R and S denote locations and have no other significance. Changes in Uv 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

The figure shows the incomplete schematic of a conventional lathe to be used for cutting threads with different pitches. The speed gear box Uv is shown and the feed gear box Us is to be placed. P, Q, R and S denote locations and have no other significance. Changes in Uv 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 Correct Answer S and E are connected. U<sub>s</sub> is placed between S and E.

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

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