will one mill file cut another mill file?

If both are hardened,No - but it will ruin both.
If one has been annealed to make a knife,the the hard one will cut the soft one.
Stacy
 
Heat whichever one you intend to make a blade out of to red hot temp,or non magnetic and let cool at room temp.you'll be able to file that bastard like theres no tomorrow.
 
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