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You most certainly will not be ruining a file with chalk, either being either gypsum or talc. It may work as a dissecant to keep the files safer from air moisture, but the thing you’ll really notice is the effect it has as a lubricant. It makes the initial passes a lot easier, and it does smooth the action of the file, which could to a certain extent give a better finish – steadier, straighter and easier to control strokes, less vibration, less screeching hair-erecting high pitched noises. We absolutely underestimate how making something less unpleasant to do effects positively in the results. We dont rush as much to finish it, so we do it better, for as longer if necessary, we dont avoid doing it when needed, and the “good enough” mark goes up quite a bit.
On a note, thats why I hate turning on machines. Need to setup dust collection, push stuff around, wear safety equip. I just want to finish the process im on as quickly as possible so I can claim my shop floorspace back. Then, I get bad results from the resawing, or thicknessing I was on. Which makes me dread the next time when ill need to it again.
Could be the acidic component, yes. But really, plain water works, demineralized (distilled, either for car batteries, sterillizing ovens or medical grade) is better (no scaling, no other trace substances to add for possible factor shoukd anything awry happen), water + dish soap better still. I do just like someone reported earlier in the thread, a rougly 50/50 distilled water + alcohol (either isopropyl or ethanol, anhydrous) and some dish soap. Recently Ive been adding some automotive glass cleaner, which had no vinegar, and add a little (5-10ml in 500ml of the solution) for the pretty blue color and extra bubbles. No adverse effects so far, but no perceived benefit other than the pretty blue tint. Don sweat about it!
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