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Note
that the Type D's frame at left now has a connection between the rear
spindle
bearing housing and the housing of the main gear's shaft, compared to
the
unconnected spindle bearing of the older Type E at right. There was
also
a change in the shape of the side handle between these two drills, from
the "doorhandle" shape of the Type E to the smaller knob, shaped
much like the Type D's crank handle. Not only that, but the number of
teeth
in the main gear went down from 76 in the Type E's main gear to 73 in
the
Type D's gear; and the pinion lost some teeth as well, from 17 to
16. These changes came before
the move from Millers Falls MA, to Greenfield, MA.
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Ted Sodt pointed out
another change: The shaft on which the main gear
turns is integral with the cast iron frame in Types K1 through E, but
from D onwards the shaft is a steel insert, press fit into a fatter
frame boss. |
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