The easiest way to pick a combination is to determine how fast you want to remove material and what you want the surface finish to be. The interlaced teeth create a diamond-like pattern which allows the file to cut twice as fast as a single-cut file. Medium Speed/Good Surface (Hard Material): Use a single-cut medium or double-cut fine. 'All Intensive Purposes' or 'All Intents and Purposes'? After the teeth are made the bar is heat-treated making it harder than most other materials it is likely to come across. But the name obviously intrigued me. This is both inefficient and potentially damaging to the file. Learn a new word every day. Slow/Good Surface (Soft Material): Use a medium file. Your email address will not be published. However, this roughing down leaves small ridges that will have to be smoothed by finishing with a Single Cut Mill file. Simply grab one and saw away. Draw filing is a modified technique that should only be used with single and double-cut files. So years ago I went to the local hardware store, asked for a bastard file, payed for it, and have been using it ever since. The character gives special properties to the file such as making a file cut faster or slower independently of its coarseness. Please tell us where you read or heard it (including the quote, if possible). The reason sawing back and forth is acceptable in this case has to do with the diagonal teeth of the single and double-cut files. in Engineering Design and a M.S. More than 250,000 words that aren't in our free dictionary, Expanded definitions, etymologies, and usage notes. This gives the user the most amount of control. Sean has a B.S. 'Nip it in the butt' or 'Nip it in the bud'? Double Cut — Surface has two sets of diagonal teeth and is often used with heavier pressure than single cut for rapid material removal.. Filing back and forth is wrong for two reasons. By lifting the file after a cut it allows for the cut material to fall out from between the teeth and make room for the next pass. The second-cut files, 12 inches and longer, are double cut. Normally, a standard Mill Bastard file is used for drawfiling, but where a considerable amount of stock has to be removed, a Flat or Hand file (Double Cut) will work faster. Pillar files are used to file in slots and keyways. Slow/Good Surface (Hard Material): Use a fine file with a single cut. They are separate, disconnected, and typically stand much taller than other cuts. With practice your thumb can vary the pressure to precisely control the amount of material that is removed. He has over 7 years of product development experience in a variety of industries ranging from medical, automotive, furniture, consumer products, and defense. They are used for very large removal of soft materials such as wood or plastic. Sean enjoys hiking, mountaineering, skiing, movies, and is pursuing a Ph.D in his free time. Without removing that material the next pass will be less effective. To clean a file use compressed air, rags, or a file card brush (see Figure 7) to prevent material build up. The correct technique is to push the file forward to make a cut then lift the file off of the work piece when the file is drawn back. Don't know the detailed history, but suspect "bastard file" shares a root with "bastard sword", being intermediate between a short and a long blade. Let’s go over the basics. The effectiveness of a file is based on picking the best combination of cut and coarseness for your specific application. See more. Your palm is used to help press down while your dominant hand is used to guide and control the direction of the file. Curved-cut files have teeth cut in a curved contour across the working surface of the file. Files do not include a handle but do have a tang that fits into a handle. When a file is pushed forward the cut material collects between the teeth of the file. With the double-cut variety of file both strokes of the file are cutting into the material reducing the chance of dulling.
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