Reply To: Stationary hand drill press – how does it work?
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David,
Here are my guesses.
The vertical rod (blue arrow) passes through the frame bits just as it appears (including the center axis of the crank wheel).
The vertical rod is in two segments that can rotate freely from one another – while maintaining their vertical alignment. This allows the upper portion (pointed to by the gold arrow) to turn with the height adjusting screw, and the lower to turn with the crank wheel and chuck.
Meanwhile, the crank wheel turns on a stub axle off the side of the frame, which we can’t see from this view. It does not pass through the frame, despite appearances. Power is transmitted from the crank wheel to the two cogs. Some complexity behind the bronze/brass fitting selects which cog engages splines on the lower section of the rod to offer two speed ratios for the chuck.
Ratio selection is related to the part going from the hole in the side of the fitting through a branch of the frame, and out to the bronze/brass cap. It’s not clear from the pictures, whether this bit is threaded, or surrounded by a spring but it appears to be capable of some sort of in/out motion.
The square-headed plug threading into the apparent (but fake) crank axle housing probably serves as a lubrication port but may exist to service the connection between the upper and lower sections of the rod.
I’m not familiar with these hand drill presses, and find it interesting that it works with a key-less chuck.
It will be interesting to learn what you find out from further analysis.
Best,
Rick G.