title_body: Which is better for grinding coffee: Food processor or blender?
upvoted_answer: I guess both food processors and blenders would act like big blade grinders. Blade grinders give particles of a wide range of sizes, from fine dust to chunks.  This gives uneven flavor extraction (if you can taste it), and requires the use of the finest filter.  If I had to choose, a small food processor might be superior, since the blades on blenders are pitched to stir more than to cut.  
  
  Lacking a burr grinder, which gives more consistent particle size and therefore predictable extraction, I'd repurpose an old pepper grinder!