Lee Valley Tools Woodworking Newsletter
Vol. 2, Issue 1
September 2007
 
From the Collection
 

Bayley's Core Box Plane

 
Bayley's core box plane.


Pattern making using the traditional sand-casting method requires that patterns of the final shape be created. These patterns are often constructed using wood, allowing for the shrinkage of the metal from the liquid-poured state to the cooled-solid state. A pattern can be composed of the final shape pattern and potentially numerous cores, conducive to passageways, cavities, or even full-hollow sections as found in pipe. The pattern becomes the positive, and the core becomes the negative, restricting the flow of liquid into a specific area. To construct a cylindrical core, a core box must be created. It becomes the mold used to construct the core.

There are two accepted methods for using a plane-type device to construct a channel of semicircular cross section, creating a form for making a round core. The first uses a V-shaped base to ride on the sides of a roughed-out base that replicates one-half of a cylinder. This type of plane is worked through the arc after the final width of the semicylinder is calculated. The rough waste is removed beforehand, using numerous controlled saws or a combination of chisel cuts and small rounding planes. The plane then rides on the two edges of the cut slot and is rotated through the arc, cutting the semicylinder. This was an early method of cutting a large semicylinder.

The second method using a plane is done by restricting the sides and creating a swinging-blade holder that allows a fixed-sized semicylinder to be cut. The wastage is roughed out as described above. The length of the cutter blade exposed from its holder controls the size of the radius. The ratcheting movement of the handle advances the cutter through the arc by using a gear and a pawl. This mechanical method was used as early as 1866.

 

   Go to Page:   1   2   Next Page

 
Other Articles from this Issue
 
 
What's New in Woodworking
 
Squirrel-Tail Palm Planes

Squirrel-Tail
Palm Planes
Painter's Pyramid™

Painter's
Pyramid™
Weather-Resistant Tool Bags

Weather-Resistant
Tool Bags
Wood Magnet™

Wood
Magnet™
 
What's New in Hardware
 
Trash Bag Holder

Trash Bag
Holder
Beaded Hardware

Beaded
Hardware
Pewter Hardware

Pewter
Hardware
    News & Events  
 
 
  Recent Catalog Mailings

Upcoming Trade Shows

Lee Valley Seminars
 
 
    Features
  From the Collection
Featured Patents
From the Archive
Customer Letters
What Is It?
 
    Subscriber Services
 
 
  Subscribe

Privacy Policy

Newsletter Archive