The mishna in Masechet Shabbat says:

A man may take a hammer to split nuts, a chopper to cut [a round of] pressed figs, a saw for sawing cheese, a spade to scoop dried figs, a winnowing shovel and a pitchfork to place [food] upon it for a child, a reed or a whorl to stick [food], a small needle to remove a thorn, and a sack [needle] to open a door therewith.

We are allowed to use tools on food which are not designed for food on Shabbat, like a saw to grate cheese e.g. Parmigiano

The topic of the mishna is Muktse.

But an additional problem may be of Tevilat Kelim if the tools are manufactured by gentiles.

Do commentaries or poskim infer from this mishna that tevila is not necessary for incidental use? The saw will remain a saw to work with wood. Two defects:

  • 1 time (as a new cup which you want to use 1 time before its tevila)
  • not essential (the contact with food will be for one time only and there is no reason to make tevila after this unic use).
  • 1
    judaism.stackexchange.com/a/51158 – msh210 Aug 23 '16 at 20:43
  • @msh210 Your link is good. My question is if the Mishna I refered is used about the topic. It is not clear for me. – kouty Aug 23 '16 at 21:31
  • Accidental is probably not what you mean. Perhaps you mean occasional abnormal or uncommon? Accidental may mean abnormal in musical notation but in this situation it would mean having used it without thinking, and keilim which lack tevilah never make the foods inedible. – user6591 Aug 23 '16 at 22:41
  • @user6591 yes, you are right, I mean not programmed. I mean that in some not programed situation, we need this Keli for food consummation – kouty Aug 24 '16 at 6:13
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    @mevaqesh perhaps knw you someone who can explain you the question? I am sorry if it is too hard. – kouty Dec 5 '16 at 21:54

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