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Miter Boxes


   
 

Working with Hands - James E. Price


 
  Examining Larger Countersinks 1 of 2  

Let's examine some more countersink bits. 

These are much larger than those used in general cabinetmaking and carpentry.

 

These are called deck doweling bits and were used almost exclusively in the shipbuilding trade. All that are marked were made in England and Scotland. I think these bits were not used here in America because all I have were acquired from English tool dealers and I have never found one in any of my travels in the USA.

These bits were primarily use in attaching deck boards to timbers in ship construction. Deck boards were often bolted in place with copper bolts, nuts, and washers.

The tools were used after another bit had bored a hole into which the bolt was to be inserted. Deck doweling bits were use to bore a deep hole as a countersink to hide the bolts. The blunt cylindrical end of a bit was inserted in a bolt hole, which served as a pilot hole, and then rotated to bore a countersink.

After the bolts were put in place and tightened, wooden dowels of the appropriate size were driven into the countersink hole and trimmed flush with the deck surface. As you can see in the photos, there are several variations to these bits. Some have lead screws to pull the bit into a bolt hole but this type is rather rare. One in this assemblage could be used on two sizes of holes through the use of a bushing cap on the pilot cylinder.

This photo shows three hand forged bits on the left.

These are all manufactured bits with smooth and threaded pilots.


 
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Breast Drills


Spofford Braces



   

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