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List pairs of gears that
can be combined to give
the required gear ratio
This shows a list of compound gears that can be used to produce any gear ratio. You can enter the gear ratio as a decimal number or a fraction with / .
Enter the gear ratio you require in the box below.
The default is 1.27 for converting between imperial and metric. This is used because 1.27 * 2 = 2.54 which is the conversion factor. The ratio 1.27 is used to convert imperial to metric. The inverse ratios are used to convert metric to imperial and this can be achieved simply by flipping the compound gear over e.g. 100/127. Other ratios can be used for the conversion, as explained in the help file. The ideal conversion gear for converting an imperial lathe to metric is a compound gear with 127/100 teeth, but actually you can use any gear combined with the 127 tooth gear to give conversions without any error.
eg 127/80, 127/100, 127/120, 127/130, 127/135 etc.
For metric to imperial you could use any ratio with 127 on the bottom line:
eg 80/127, 100/127, 120/127, 130/127, 135/127 etc.
However, you need to compensate for these deviations from the 100 gear. eg if you use 127/80 instead of 127/100 you can compensate with stud and leadscrew gear(LSG): eg stud=100, LSG=80 or stud=50 and LSG=40 or using gearbox settings. RideTheGearTrain will do this for you, as long as you have appropriate gears.
The program allows you to enter the ratio e.g. 1.27 or any fraction containing a "/" as in 127/120. The display tells you other gear combinations that give approximately the same ratio is you selected, and shows the percentage error with these combinations. Any gear combination you choose can be tested in the geartrain program (see Help). A close approximation is 80/63 and 63 can be used in place of 127. If you enter 80/63 ie 1.2698, it has -0.01574% error, the program calculates errors relative to 1.2698, not 1.27 so we have to add % errors together. They could cancel if one is positive and the other negative.
Other uses for compound gears include the ratio Pi=3.14159 for modulus and diametric pitch.
This function does not use any of the lathe data you entered above for gear train calculations!