Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
equipment:metalshop:howto:how_to_use_files [2026/10/23 21:20] – removed - external edit (Unknown date) 127.0.0.1equipment:metalshop:howto:how_to_use_files [2026/10/23 21:20] (current) – ↷ Page moved from equipment:metalshop:how_to_use_files to equipment:metalshop:howto:how_to_use_files ralawrence
Line 1: Line 1:
 +====== How to use a file ====== 
 +
 +**Eye Protection**
 +
 +  Always wear safety glasses or goggles – metal swarf (filings) can fly into your eyes, especially when filing harder metals.
 +  Choose the Right File
 +  Cut (coarseness): Use a bastard or second-cut file for fast removal of material. Use a smooth or dead-smooth file for finishing and fine work. Shape: Use a flat file for general surfaces, a half-    round for curves and concave surfaces, and a triangular or square file for corners and slots. Size: A longer file (e.g., 250–300 mm) is better for large, flat surfaces; a shorter file (e.g., 150–200  mm) gives more control on small workpieces.
 +
 +**Fit a Handle (Essential)**
 +
 +  Always fit a sturdy wooden or plastic handle onto the file’s tang (the pointed end).
 +  Never use a file without a handle – the tang can puncture your palm or wrist if the file jams.
 +  
 +**Secure the Workpiece**
 +
 +  Clamp your workpiece firmly in a vice with the jaws just above the vice surface.
 +  Protect finished surfaces by using soft jaws (copper, aluminium, or leather) over the vice jaws.
 +  Keep the work at elbow height so your forearm is roughly horizontal when filing.
 +
 +**Correct Grip**
 +
 +  Hold the handle with your dominant hand, with your palm over the end of the handle and your thumb along the top.
 +  Place your other hand on the front (toe) end of the file, with your fingers curled over the top edge and your thumb resting on the underside or side – this hand applies downward pressure and guides   the file.
 +
 +**The Filing Stroke (Forward Cut Only)**
 +
 +  Files cut on the forward (push) stroke only.
 +  Forward stroke: Apply firm, even downward pressure with both hands. Push the file smoothly and steadily forwards at a slight angle (about 10–15°) across the work to produce a shearing action.
 +  Backward stroke: Lift the file slightly off the work on the return stroke – or at least release all downward pressure – to avoid blunting the teeth.
 +  Use the full length of the file where possible, not just the middle.
 +
 +**Body Position and Motion**
 +
 +  Stand with your feet shoulder-width apart, facing the vice.
 +  Move your whole upper body from the shoulders, not just your arms – this gives a straighter, more controlled stroke.
 +  Keep the file level throughout the stroke to avoid rounding the edges of your work.
 +
 +**Checking Your Progress**
 +
 +  Pause frequently and clean the file teeth with a file card or a stiff wire brush (brass is best to avoid damaging the teeth).
 +  Check your work with a straight edge or square to see where high spots remain.
 +  Mark high spots with a marker pen or engineer’s blue, then file again until the surface is flat.
 +  Draw-Filing for a Smooth Finish
 +  For a finer finish, use draw-filing:
 +  Hold the file in both hands, one at each end, perpendicular to the work.
 +  Pull the file sideways (across the work) with light, even pressure, using the length of the file like a sanderThis removes scratches and leaves a smooth, polished surface.
 +
 +**Safe Use and Storage**
 +
 +  Never strike a file with a hammer – they are hardened and brittle; they will shatter.
 +  Never use a file as a pry bar or lever.
 +  Clean your file after use with a file card, brushing in the direction of the teeth (from heel to toe) to remove swarf.
 +  Store files separately so their teeth do not knock against each other – use a rack, a cloth roll, or wrap each in oily rag.
 +  Lightly oil your files after cleaning to prevent rust.
 +
 +**Pro tip:** 
 +
 +  For soft metals like aluminium or brass, use a file with a coarser cut and clean it more frequently, as these metals clog teeth quickly. For hardened steel, you will need a new, sharp file – a blunt file will just skid and burnish.