Millers Falls No.2 Eggbeater
Drill Type Study
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Frame and Gear Changes from
Type
D to Type C
The frame of the double-pinion Type C at left is not that much different than that of the Type D at right, except for the obvious changes: A pinion was added to the Type C, so the LRRCW from the Type D was no longer needed. This was a retrograde step, because the second pinion generates more friction in the meshing of teeth than the LRRCW expends in spinning on its small axis; and the LRRCW much better supports the main gear of the Type D than the second pinion resists tipping of the main gear of the Type C. The second pinion of the Type C does not relieve the Type C's main gear of bending loads from the effects of the contact pressure between the pinion teeth and gear teeth.