Millers Falls No.2 Eggbeater Drill Type Study
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Two Type M's and a Type P

Both Type M's: H on left, K on right
Match marked 3
These three drills were all hand-fitted in batches. The two cast-iron-framed ones at far left were stamped with letters H & K, respectively, and the bronze-framed drill to their right was stamped with the numeral 3, suggesting that the cast iron examples were made in a batch larger than ten, and the bronze example in a batch of less than ten. The markings are located on the spindle & frame of the "H" drill; on the spindle, frame and chuck of drill "K"; and on the spindle, frame, and even the pinion gear of drill "3". The K-marked chuck fits both H & K drills.
Match marked H
All three K's
Match marked 3
I have a Pratt & Whitney metal planer that is also match marked (with the numeral 8); it was made about 1876. The Type O drill that Sandy Moss found is fitted with an 1877-dated two-jaw chuck made by Millers Falls.

Those observations suggest that these three drills were made at or about the time of the 1877 chuck invention, right after the wraparound frames of the cast iron drills were redsigned to be slender enough to become chilled in the casting mold and therefore convertible to malleable iron by a later heat treatment, which made them ductile and also soft enough to be easily machined.

Speculating even further, the bronze-framed Type P drill would have been made in a small batch as practice to perfect the machining setups to be followed in production of larger batches of the malleable-iron framed drills.
The "K" match marked drill's crank has a skillfully executed braze repair (image at far left, above).
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Drill Type M, match marked HDrill Type M, match makred K Thrust arrangement of drill H
Match marked K thrust
Frame of Type P
The frame designs of the two Type M malleable-iron framed drills (at far left, match marked "H" and "K" respectively) do not exactly match the design of the bronze-framed drill, but they do closely resemble the frames of the nearly contemporaneous wraparound framed drills,  Type L0, and Type Pre-L, both of which have the nearly flat, unlined main gears of these two Type M drills.  The method of handling & adjusting end play and gear mesh is different here than in the later iron drills, again suggesting a pattern of product development. The "H" and "K" drills both have screw adjusters, somewhast obscured here by accumulated grease & chips, but H's screw (top) is secured by a square nut, and the K screw (bottom) has a pair of wrenching flats on its screw. Type P's tooth counts: 68 & 21, vs. 78 & 16 for Type M.