We put the cut chips in big bowls of water. When they where all cut, we drained the chips and dried them between two clean kitchen towels. Piled them in a bowl and heated s large heavy pot full of oil. The oil got very hot. When it came time to fry the chips, we had the kids play outside for the most part to avoid any oil injuries. It takes 3-5 minutes to cook a potato chip to optimum crispness. It took a while. We skimmed them out with a metal skimmer.
Put in a paper towel lined metal pan or metal colander. The best part of teaching knife skills with potato chips (free hand, without a food processor or other appliance) was that they felt extreme ownership for those potatoes. They could easily tell if the thickness was acceptable when it was fried and we got to talk about the cooking times being different for thick and thin cut potatoes. It was a great lesson learned.