Chapter 16: Problem 43
Search for information on wear damage to plastic worms and worm gears and list several articles dealing with this topic.
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Chapter 16: Problem 43
Search for information on wear damage to plastic worms and worm gears and list several articles dealing with this topic.
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Review the web site http://www.bisongear.com. From the products line, select a speed reducer for a \(\frac{1}{8}\) horsepower motor. (a) List the available speed reducer ratios for a \(\frac{1}{8}\) horsepower motor. (b) List the gearbox output torques for each gear ratio. (c) List the gearbox maximum torque for each ratio. (d) If an overload torque of three times the output torque is required, what would be the maximum gearbox ratio for a \(\frac{1}{8}\) hp motor at \(1725 \mathrm{rpm}\) ?
An automobile with a standard differential is stuck on an icy road, to the extent that the car does not move. The frustrated (and not very intelligent!) driver floors the accelerator and notes that the speedometer reads \(75 \mathrm{mph}\). To what normal car speed does the rotation of the spinning wheel correspond? (This illustrates the kind of "foreseeable abuse" that the engineer needs to take into consideration.)
An automobile with a standard differential turns sharply to the left. The left driving wheel turns on a 20-m radius. Distance between right and left wheels is \(1.5 \mathrm{~m}\). What are the rotating speeds of each driving wheel as fractions of the drive shaft speed?
Two meshing helical gears have parallel shafts. The gears were cut with a hob with a normal circular pitch of \(0.5236\) in. The gear center distance is 9 in., and the speed ratio is \(2: 1\). The pinion has 35 teeth. Determine the required helix angle.
An industrial machine utilizes a simple planetary train with 24 teeth in the sun and 120 in the ring. The teeth have a 4-mm module in the normal plane, and the helix angle is \(0.42\) rad. The manufacturer wishes to make available optional gearing using the same arm, a 27 -tooth sun and a 111 -tooth ring. If teeth of the same module are used, what is the helix angle?
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