Handle Attachment
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There are different ways to connect the handle to a blade:
Riveting
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One of the most traditional methods for attaching a handle to a knife is riveting.
In this method, two handle scales (the pieces that make up the handle) are attached to the knife's tang. Both the tang and the handle scales have three holes. The attachment is achieved by inserting metal rivets—consisting of male and female parts—into the holes. These parts are hammered into each other, creating a secure bond between the handle and the blade.
PROS
A cost-effective method of attaching the handle to the blade; Works well with a variety of handle materials.
CONS
Over time, the rivets may loosen. If rivets are made of aluminum, they can corrode.
If there are gaps between tang and handle, water can seep in, leading to rust forming underneath the handle.
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Injecting
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This method of handle attachment, popularized with the advancement of injection molding, involves inserting the tang into a mold and injecting molten plastic around it. The plastic then hardens, forming a seamless, secure connection between the handle and the blade.
PROS
Hygienic, inexpensive and gapless way of attaching handle.
CONS
Only possible with plastic handles. Sometimes light handle weight leads to imperfect balance.
High tooling cost for handles.
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Friction fitting/glueing
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This method is commonly used in the production of many traditional Japanese knives. In this process, a hole is drilled or sawed into the handle, which is then filled with epoxy glue. The tang is either friction-fitted (sometimes after being heated) into the handle. Once the glue dries, the tang is securely bonded to the handle.
PROS
Easy way to attach handle. Allows using different materials and material combinations with elaborate designs.
CONS
Handles may get loose if not properly glued.
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Screwing
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This method is a modern and cost-effective technique for attaching a contemporary Japanese handle with a metal end cap to a bolster knife. A round hole is drilled through the handle, and a screw is attached to the tang. The end capfeatures a nut, which is screwed onto the screw, securing the handle. The connection is further reinforced by glue to ensure a stable and durable attachment.
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PROS
Inexpensive way to attach handles for “modern” Japanese knives.
CONS
Handle is hollow and thus light.