Millers Falls No.2 Eggbeater Drill Type Study
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Type Pre-L

From Roger K. Smith, author of PTAMPIA I & II.  The main handle came from a chisel.  Both this drill and the one at right are distinguished by having the early flat-faced main gear and the riveted crank knob fastening.
From Sandy Moss: Came from a Rhode Island cabinetmaker's estate auction; it was in the Bisson family for 2 generations. Has unlined main handle.
Type Pre-L mug shot
This type can be seen to follow Type L0 with its lined main handle, but to predate Type L because it has the earlier smooth-faced pattern of the main gear of the Type M but seventeen teeth on the pinion gear like the Type L and Type L0. Types M and L both have 78 teeth on the main gear like most of the LRRCW types. The Type Pre-L at left above has a different thrust bearing arrangement than any of the earlier or later types, but this wasn't much of an improvement, because the thrust bearing on this example is worn and has no provision for adjustment. The hemispherical end of the spindle of the drill on the right bears directly on a socket in the malleable iron frame with no provision for adjustment there, either.  The chucks are the same as the Type L patented in 1877, but only the example on the right can be read.  These drills both retain the set screw used to "lock" the main gear on its shaft; this is a rare condition indeed, as most other examples I have seen have some sort of cross-drilled pin locking repair.

Both examples here have the crank knob running on a two-piece shaft.  The arrangement uses a wire shaft pressed into the crank; then the rosewood knob; then a flat washer; and finally, the end of the wire is peened to capture the washer and the knob.  Later, Millers Falls introduced a one-piece fastening method for the knob that made use of a machined pin.