82 deg vs 90 deg chamfer - Page 2
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  1. #21
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    Which makes one wonder, back in the day when they were making chariots were there cigarettes?

    Quote Originally Posted by mhajicek View Post

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  3. #22
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    Quote Originally Posted by as9100d View Post
    There are two types of countries in the world.

    1) Those that use the metric system.
    2) those that went to the moon.
    1. Ever punched a time clock? 6.5 hrs = 6:30. 6.6 hrs = 6.48 or turn it around 6:30 = 6.5, 6.48 = 6.6 on the time card stamp.
    By converting the minute to decimal made it a lot easier to calculate your pay.
    2. Trip to the moon? The people building the Saturn Rocke worked all metric. That is the only system they knew. Things had to be converted to imperial for US industry to manufacture. Same as all calculations nessecary. If things had to be done in imperial we would still be calculating today.
    3. Up to M20 = 90°, M22 - M24 = 60°.

  4. #23
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    Quote Originally Posted by steve-l View Post
    Are you sure? Please explain the 37 degree angle of JIC/AN fittings?
    Ah! You're absolutely right! Brain fart. I meant to say 37° vs 45° for many other fittings.

  5. #24
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    Quote Originally Posted by steve45 View Post
    I have wondered about flare fittings being 82° & 90°. 82° is used on airplanes that use aluminum tubing. I don't KNOW the reason, but it sounds reasonable that the 82° flare would be less likely to cause cracking when making a flare on the end of a piece of tubing than a 90° flare. Just my guess.
    The heads on flat-head rivets and machine screws for airplanes are 100 degrees included angle. This came out of WW2 airplane manufacturer starting to make airplanes out of aluminum. Button-head fasteners protruded, and in aggregate caused significant drag, especially at high speeds. The metal sheets were thin, for weight, and the metal was dimpled to accept the flat head. If the dimple was too severe, the metal cracked. Steel is far stronger than aluminum. So, the 100 degree head was born.

  6. #25
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    Quote Originally Posted by juergenwt View Post
    1. Ever punched a time clock? 6.5 hrs = 6:30. 6.6 hrs = 6.48 or turn it around 6:30 = 6.5, 6.48 = 6.6 on the time card stamp.
    By converting the minute to decimal made it a lot easier to calculate your pay.
    2. Trip to the moon? The people building the Saturn Rocke worked all metric. That is the only system they knew. Things had to be converted to imperial for US industry to manufacture. Same as all calculations nessecary. If things had to be done in imperial we would still be calculating today.
    3. Up to M20 = 90°, M22 - M24 = 60°.
    What does any of this have to do with there only being two types of countries?

  7. #26
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    Talking about this new Decimal System ...
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