Great Expectations Antiques

Circa: early 1900's
Condition: Good++
This is a very nice keyless 1/2" diameter maximum capacity 3-jaw drill chuck for holding straight shank drill bits.  Also included is a 3 degree included taper adapter so you can use this chuck on other machines such as a lathe or drill press.  The chuck is marked "MILLERS FALLS  MILLERS FALLS MASS. PAT. OCT.23.1900" in a smooth area between the knurled areas.  The chuck and the adapter have been tested, they run true/concentric to center.  The jaws and jaw spring are in good working order.  We note minor wear and storage type dings on the exterior, none effecting precision or operation.  No rust, no damage, clean!  The adapter is a very rare find!  The taper is about 2.2" long and measures from .390 to .494 over a 2" span on the taper, or a 3 degree included angle.  

Although most breast drills don't have the 3 degree included taper, this chuck is designed to be used on the Millers Falls breast drills and has the .560"-24 threads per inch which is the standard on many Millers Falls and some Goodell-Pratt breast drill models.  This is a very well engineered chuck, and will snug up a round shank drill bit nice and tight and is reliable if you give it a few drops of oil every now and then.

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