Can a sword cut a gun in half?

No. A gun barrel is basically a thick steel pipe. A sword will scratch it, but will definitely not cut through. If the gun was made of low-quality steel and you were fairly strong, you might bend the barrel slightly or damage some other part of the gun from the shock.

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Can a katana cut through a gun?

In the show, they tested the myth that japanese soldiers could slice through the barrels of american machine guns with their katanas. What they found is that there is no circumstances that a regular machine gun would have Its barrels sliced in half by a katana alone. Is it possible to parry arrows? It's extremely satisfying to parry the arrows or even block them with your guard. Few things beat the adrenaline kick you get from that. It's like when you get a perfect parry on a fleche(which does mean arrow IIRC :D). I totally recommend it as a fun thing to do with a few fencing buddies :P.

Correspondingly, can you dodge an arrow?

Absolutely. In a medium or long range you can time your dodge manuever with the moment the arrow is launched. But in the short range it still extremely hard to dodge it unless you are keanu reeves in the Matrix. Can a sword be made of diamond? Not likely. Diamonds have an undeserved reputation for toughness because they are the hardest natural mineral, but they are brittle, so brittle that they shatter under impact.

Who is the best sword maker in the world?

Yoshindo Yoshihara is considered the foremost present-day swordsmith in terms of both popularity and skill - a true genius. We interviewed Yoshihara, said to be the best swordsmith in Japan, who, even today, continues to protect the traditions and cultures of sword making. Is a copper sword good? Copper is very malleable-it's easy to shape-but it's too soft, not stiff enough, and too weak to make a sword blade. There are alloys of copper that can make a good sword blade, though. A sword made from this would have one advantage over even a steel sword-it won't rust!