DannyEssex":35hk8r33 said:
What would be the best process for restoring a file? I have quite a few that could do with a good clean.
There are a few ways to do it but basically you degrease as you like, clean as much of the gunk from the file as you can (or as long as your patience holds out), then de-rust. The optional extra step is to sharpen.
Degreasing can be done using any suitable solvent, a commercial degreaser, caustic soda or just giving them a scrub in hot soapy water does wonders.
Cleaning proper takes many forms, there's usually some brushing with a wire brush of some kind but it's often required to use a piece of wood or brass along the teeth to sort of plough out the gunk and swarf. But metal clogging, called pinning, can be very firmly embedded (especially aluminium!) and some flick them out one bit at a time using a needle :shock:
If you want to sharpen the file you either soak in an acid after all this or if your rust remover is an acid already you just soak it for longer. Some files can be brought to better-than-new condition by an acid soak, sharper and more 'bitey' than many a file made today. Even weak acids like vinegar and citric acid will do the trick.
stoopiduk":35hk8r33 said:
Probably a daft question, but how can you tell the manufacturer of so many of the files? Are they stamped?
Yes, if they're branded files are generally stamped on the clear area between the tang and the start of the toothing.
Here are a few of the stamps from these files I happened to capture in the before photos:
Sometimes files are stamped on both sides, in which case on the side opposite the branding you could see practical information, e.g. descriptions of coarseness like Smooth or Dead Smooth.
You might need your reading glasses on to be able to make out a stamp even on a clean file! And if there's even a little rust on the surface it can be very hard to spot that there is even a stamp there.