A non standard thread of pitch 3.175 mm is to be cut on a lathe having lead screw of pitch 6 mm. A change gear set provided 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 x c/d) for machining the given thread are (assuming that the transmission ratio of the rest of the kinematic train between the lathe spindle and lead screw is equal to 1),

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

1.	A non standard thread of pitch 3.175 mm is to be cut on a lathe having lead screw of pitch 6 mm. A change gear set provided 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 x c/d) for machining the given thread are (assuming that the transmission ratio of the rest of the kinematic train between the lathe spindle and lead screw is equal to 1),
A.	<table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>127</center></td><td rowspan="2"> </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>20</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;">30</td><td style="text-align: center;">80</td></tr></table>
B.	<table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>127</center></td><td rowspan="2"> </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>20</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;">40</td><td style="text-align: center;">120</td></tr></table>
C.	<table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>127</center></td><td rowspan="2"> </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>30</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;">20</td><td style="text-align: center;">120</td></tr></table>
D.
E.	<table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>127</center></td><td rowspan="2"> </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>30</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;">50</td><td style="text-align: center;">80</td></tr></table>
Answer» C. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>127</center></td><td rowspan="2"> </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>30</center></td><td rowspan="2"></td></tr><tr><td style="text-align: center;">20</td><td style="text-align: center;">120</td></tr></table>

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