Bore lapping/polishing

  1. Hi - sorry I'm not an engineer just desperate!

    I want to remove pitting and marking in a shotgun bore and am having problems finding a tool which will do this in the firearms sector - and if I do I am sure it will be at a premium price - removing a small amount ie less than a thou of the internal diameter of a bore and polishing must be a fairly common requirement in engineering - does anyone know of a cheap portable tool which will do this (as opposed to factory honing) I want something I can put on a drill and spin in the bore - have tried brake honing stones but really need something which will apply equal pressure (or nearly) at all surfaces of the bore, the nearest I can get so far is to try rig up an expanding mandrel - is their anything commercially available?

  2. jcsd
  3. Danger

    Danger 9,663
    Gold Member

    I'm not sure whether or not this will work for you, but it might be worth checking out. There are valve-guide hones for auto mechanics. I don't know how large a bore they can service, though. Also, you'd definitely want to rent or borrow one; they cost upward of $350.
    My only other suggestion would be to wrap sandpaper or drywall screen around a sponge on a stick.
    (That's not my final answer, but I've got nothing else right now.)
  4. sophiecentaur

    sophiecentaur 14,335
    Science Advisor
    Gold Member

    Your bore is tapered, I imagine. That doesn't help.
    How about a sponge mop and valve grinding paste? Lots of rotation and reciprocation to spread the wear and avoid high / low spots.
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