Files and Rasps
From DT Online
Files are abrading tools used to remove small amounts of metal and plastics. The teeth of a file are known as the ‘cut’ and are created by a ‘single cut’ across the file blade or a ‘double cut’ which creates diamond shaped teeth. Common ‘cuts’ of files are graded as smooth, second cut and bastard cut.
Note: Draw Filing is done by holding a file with one hand each end across the edge of material and drawing it backwards and forwards to smooth out file marks. When filing convex curves the file should rolled around an imaginary opposite curve as shown.
A range of Files, Rasps and similar abrading tools are shown below (from left to right) :
| Engineers' Files | - The common cross-sections of files are hand, flat, round, half-round, triangular, square, and knife edge. A Flat File (aka Mill File) has a tapered blade whereas a Hand File is parallel and has a safe-edge to enable filing up against a shoulder - these are the most commonly used files. Triangular (aka Three Square) files are useful for working one side of a square shape whilst avoiding the others. They are also available as saw sharpening files. |
| Warding Files | - small tapered files for cutting fine slots as used by locksmiths when making Warded Locks. |
| Needle Files | - small files available in a variety of shapes for small intricate work in jewellery for example. |
| Dreadnought (curved teeth) and Millenicut (straight teeth) Files | - these are very coarse, deeply cut and sharp files used for rapid removal of soft materials such as aluminium, copper and some plastics. |
| File Card | - this is a brush with metal bristles used to remove waste metal particles from in between file teeth. This clogging of teeth is known as ‘pinning’ and may be reduced by first rubbing a file with chalk. |
| Rifflers | - these are medium or small size files in a variety of shapes and often curved at the end to enable them to work the bottom of recesses such as when die making. Also available with rasp-like coarser teeth for similar work in wood. |
| Surform | - used to shape wood. Surform blades are made from a perforated steel strip with the rim of each hole sharpened to form a cutting edge. |
| Rasps | - similar tools to files but are used to shape wood and tend to have coarser teeth |
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