54 degrees rotation

penguin

May 10, 2019 18:33

I was reading about Weatherby rifle design of 9 locking lugs. 3 sets of 3. It also said the action had a 54 degree rotation to eject a cartridge and reload.If you have 3 sets of lugs with 3 areas to allow the lugs to clear the chamber would you not have 60 degrees of rotation to work the bolt? I must be missing something. I am assuming the lugs were equally states at 120 degrees apart.

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  BobJudy

  May 10, 2019 22:52

  If the lugs are only 54 degrees of the 360 then the bolt only needs to rotate 54 degrees to clear the recesses. I think Bob

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  11b6r

  May 10, 2019 23:52

  WIDTH of the lugs as a percentage of 360 degrees comes in to play.

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  babun

  May 11, 2019 08:21

  11b6r wrote:

  WIDTH of the lugs as a percentage of 360 degrees comes in to play.

  
  +360
  
  Think if the lugs were just toothpicks mating into 1/8" holes. . You could need only 5 degrees of turn before they disengage.
  The Remington 788"s { a great underrated rifle} had the equal 3 sets of 3 lugs....60 degrees.

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  charliemeyer007

  May 16, 2019 19:26

  Roy wasn't the first to use interrupted threads on a rifle bolt. I have a Charles Newton rifle from 1912-20 that multiple locking lugs and the nicest double set triggers I have ever used.

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