TK Puzzle

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Across
  1. 3. rate of supply
  2. 4. Material made out of
  3. 7. term for connection in machinery
  4. 9. back and forth movement
  5. 10. mathematical rule
  6. 11. how easy it is to machine the product
  7. 13. separates to pieces
  8. 14. point where two objects touch
  9. 15. measures deepness
  10. 17. when something
  11. 18. opposite of easy
  12. 19. material that will not rust
  13. 21. a half diameter
Down
  1. 1. a sharp corner
  2. 2. measures how good something is
  3. 5. to offload something
  4. 6. the outermost layer of something
  5. 8. irregularities on surface
  6. 11. a planned way
  7. 12. measures materials resistance
  8. 16. two get together
  9. 20. guides something forward