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Across 2. a hole, or an empty space between two surfaces 4. the length of a straight line passing through the center of a circle and connecting two points on the circumferenc 7. the degree to which something is strong or powerful 9. a change in the usual shape of something 11. an object used to locate something in machining 12. strong metal that can be shaped easily, consisting of iron and carbon 13. a part of mold for making holes 14. a thin pointed piece of metal that you push and turn in order to fasten something 16. a straight line joining the centre of a circle to its edge 19. work consisting of a piece of metal being machined

Down 1. a chemical substance that exists in a pure form as diamonds 3. a chemical element that is a light, silver-colored metal, used especially for making cooking equipment and aircraft parts 5. the ability of a metal object to absorb considerable energy before cracking 6. empty or clear, or containing no information or mark 7. a tool or liquid chemical used to remove something from a surface 8. the area of mathematics relating to the study of space and the relationships between points, lines, curves, and surfaces 10. bring to a desired consistency or hardness by a process of gradually heating and cooling 15. to become thinner or weaker after continuous use 17. a metal that consists of two or more metals mixed together 18. deformation of a physical body under the action of applied forces