A non standard thread of pitch 3.175mm is to be cut on a lathe having lead screw of pitch 6mm. A change gear set provdied with the lathe has one gear each with the following number of teeth: 20,30,40,50,60,70,80,90,100,110,120,127. The correct pairs of change gears (a/b×c/d) for machining the given thread are (assuming that transmission ratio of the rest of the kinematic train between the late spindle and lead screw is equal to 1)

A non standard thread of pitch 3.175mm is to be cut on a lathe having

1.	A non standard thread of pitch 3.175mm is to be cut on a lathe having lead screw of pitch 6mm. A change gear set provdied with the lathe has one gear each with the following number of teeth: 20,30,40,50,60,70,80,90,100,110,120,127. The correct pairs of change gears (a/b×c/d) for machining the given thread are (assuming that transmission ratio of the rest of the kinematic train between the late spindle and lead screw is equal to 1)
Answer» A non standard thread of pitch $3.175 m m$ is to be cut on a lathe having lead screw of pitch $6 m m$ . A change gear set provdied with the lathe has one gear each with the following number of teeth: $20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 127.$ The correct pairs of change gears $(a / b \times c / d)$ for machining the given thread are (assuming that transmission ratio of the rest of the kinematic train between the late spindle and lead screw is equal to 1)

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