shock proof--what does it all mean?

Thread: shock proof--what does it all mean?

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  1. #1
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    shock proof--what does it all mean?

    I dropped my Helson Sharkmaster on the tile floor yesterday from about 3ft. (not happy)
    no damage to floor or watch. I then set the watch and its running a -5 sec in last 24h.

    how much damage can occur in a 3-4ft free fall?

  2. #2
    Member lysanderxiii's Avatar
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    Re: shock proof--what does it all mean?

    You can break the balance staff in a drop of one inch onto a hardwood table, I have done it before. Generally, this only occurs with a non-shock resistant watch, that has a big heavy balance.

    Just remember, a three foot drop onto a hardwood floor results in about 3000 g's, and tile floors, being harder and thus having a shorter deceleration distance will push the g-loads even higher, probably about 50% higher.

    ISO 1413, Shock Resistant Watches puts forth the minimum standards for a watch to be labled "shock-resistant." In it, it specifies a test to produce an equivalent acceleration to that of a watch dropped one meter onto a hardwood floor, twice. Once hitting the side opposite the crown, once hitting the crystal.

    The watch should "not stop after either of the two shocks", nor should it change its rate more than 60 seconds per day (2 seconds per day if a quartz). Yours is well within these limits.

    Why does it change rate?

    On most all movements these days, the regulator arm, and balance spring terminal arm are both held in position by friction. These arms do have some mass and when subjected to high accelerations may move, which will affect the rate. There is also the minor chance something else bends that alters the rate.
    Parit enim conversatio contemptum; raritas conciliat admirationem.- Lucius Apuleius
    est necessry, accurate ad secundo? - Lysander magna
    iustum est horologium - Obscurus Genius

  3. #3
    Member clouser's Avatar
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    Re: shock proof--what does it all mean?

    What was the accuracy before you dropped it?

    If it's running just 5 sec. slow, I wouldn't worry about it.
    Human existence is completely dependent on the upper 6 inches of topsoil and the fact that it rains.

  4. #4
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    Re: shock proof--what does it all mean?

    Quote Originally Posted by travis View Post
    it's running a -5 sec in last 24h.
    Just set your watch 5 seconds fast, and bob's yer uncle!!
    Sorry, couldn't resist.
    DW

  5. #5
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    Re: shock proof--what does it all mean?

    Thanks guys. It's all good just worried about my #10

  6. #6
    Member romeo-1's Avatar
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    Re: shock proof--what does it all mean?

    What was the watch running before the drop?
    Chuck Norris doesn't wear a watch...HE decides what time it is.


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