The function of a file and how to extend its lifespan

Here is a brief introduction to the functions of a file and how to extend its lifespan:

(1) Functions of a file:

The cross-section of a file shank used for polishing is polygonal. Multiple sides of the polygon have curved and straight edges. A groove is formed between two adjacent straight edges, and a groove is formed on the file body. An acute angle can be formed between two adjacent straight edges. This multi-purpose file is suitable for manicuring nails, sharpening fishhooks, repairing keys, polishing glass holes, polishing platinum in car ignition systems, etc. It is an indispensable item in daily life, a powerful tool for electricians and installers, and can even be used for carving handicrafts. Made of high-quality T12 carbon steel, it is durable and has sharp teeth! A 3-pack of woodworking files is packaged in a hanging bag and is made of high-quality T10 carbon steel, durable and with sharp teeth! A 6-pack of assorted files is made of heat-treated carbon steel, finely crafted and durable!

(2) How to extend the lifespan of a file:

As we all know, filing is an important basic operation for assemblers. There are many types of files, the most common being round files, flat files, shaping files, polishing files, and triangular files. Different products require different sized files, and choosing the right tool is crucial for extending the lifespan of a file. Filing is a machining method that uses a file to cut and shape a workpiece to achieve the desired dimensions, shape, position, and surface roughness. It can machine internal and external planes, internal and external curved surfaces, internal and external angles, grooves, and various complex shapes. Even in modern industrial production, some parts still require manual filing, such as the finishing and repair of individual parts during assembly, the machining of complex-shaped parts in small-batch production, and the machining of templates and molds. Therefore, proper file maintenance is also essential for extending its lifespan. Below, I will share some experience I have accumulated in teaching and work, for discussion.

First, before use, carefully inspect the file for damage and ensure that the file teeth are intact. Check the surface of the casting to be machined for a hardened layer. If present, grind it with a grinding wheel or remove it with the toothed surface of an old file before proceeding with normal filing.

Secondly, please note the following precautions during use:

1. When using a new file, use only one side initially. Only use the other side after it becomes dull. Never alternate between the two sides of the file during filing.

2. When coarse filing, make full use of the file's effective length. This improves filing efficiency and prevents localized wear on the file teeth. When fine filing with a fine-edged file, apply a layer of chalk evenly to the file teeth to achieve a smoother surface. This reduces the amount of material removed with each stroke and prevents file chips from becoming embedded in the file teeth. The final surface roughness can reach Ra 1.6 microns.

3. During use, promptly remove any file chips embedded in the file teeth with a wire brush. Clean along the grain of the file teeth to ensure thorough cleaning. Never blow away file chips, do not rub the file surface with your hands, and do not wash it with water.

4. During use, do not use the file as a pry bar or hammer, and avoid contact with lubricating oil or water.

Finally, thoroughly clean the file after use to prevent rust. When storing in a toolbox, do not stack it with other tools or workpieces, nor place it on top of other files, as this may damage the file teeth.

Of course, the force applied by your hand and the filing speed will also significantly affect the lifespan of the file. Only by following the correct operating procedures and proper maintenance can the lifespan of the file be extended.