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Pendulum clock

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Pendulum clock

  1. 1. Pendulum clock for dummies Ivo Six 3IO Constructieleer Docent: Rino Versluys 400 days clock
  2. 2. History Inventor: Christiaan Huygens Year: 1656 Nationality: Dutch (Netherlands) Error a day: 15 min ↔ 15 sec
  3. 3. Parts Escapement Mainspring Gear train Pointers Pendulum
  4. 4. Pendulum v v Fw Fw ± point mass: Spheres = Steel Rest= Copper Wire = Springsteel  No deformation  No loss of energy Length = very important  time Adaptable with bolt Mass = not important F1 F1 M1 M1
  5. 5. Escapement F1F1 F2 F2 M2 Gear = Copper (big) & steel (small)  Low corrosion & easy to produce (soft) Axis = Steel  Cheep
  6. 6. Gear train Minute axis (3) M3 Escapement axis 1 (2) i(3-2) = z3a/z2b = 96/8 = 12 i(2-1) = z2b = 20 Escapement axis 1 (1) 2b 2a 3a 3b 60 min  1 tour  number of returns = 1 x i(3-2) x i(2-1) = 1 x 12 x 20 = 240
  7. 7. Mainspring Springsteel Wind up tool Copper
  8. 8. 3b Minute axis (3) Mainspring axis 3 (4) Mainspring axis 2 (5) Mainspring axis 1 (6) 4a 4b 5a 5b 6a 6b 7 Mainspring(7) i(3-4) = z3b/z4a = 8/60 = 2/15 = 0,133 i(4-5) = z4b/z5a = 10/60 = 1/6 = 0,167 i(5-6) = z5b/z6a = 12/60 = 0,2 i(6-7) = z6b/z7 = 12/90 = 2/15 = 0,133 400 days = 9600 hours = 9600 minute axis turns Number of turns mainspring = 9600 x i(3-4) x i(4-5) x i(5-6) x i(6-7) = 9600 x 2/15 x 1/6 x 0,2 x 2/15 = 5,7 turns
  9. 9. Pointers 3c (under) Minute axis (3) Hour axis 2 (9) Hour axis 1 (8) 8a 8b 9 i(3-8) = z3c/z8a = 12/36 = 1/3 = 0,333 i(8-9) = z8b/z9 = 10/40 = 1/4 = 0,25 60 min  1 tour  number of turns hour axis = 1 x i(3-8) x i(8-9) = 1 x 1/3 x 1/4 = 1/12 tour Plastic axis (hour) & metal axis (minute)  Low friction 1 Hour

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