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  1. #51
    Join Date
    Nov 2003
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    Stuck in perpetual Meh
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    Quote Originally Posted by DJSapp View Post
    1. Ice jacking leading to metal fatigue

    2. Remove gondola cars from rope, remove rope from shivs (may need to do this at multiple towers to get enough slack), pull rope clear from tower, rig crane (heli or truck crane) to tower, lift, unbolt, inspect, reinstall if no repair is necessary
    Oh, so an afternoon, a couple of buddies, and a case of National Premium should do it?

    Quote Originally Posted by ill-advised strategy View Post
    was this "safety monitoring system" just somebody with eyes and a cell phone riding the lift?
    ..or was it a robot meant to LOOK like somebody with eyes and a cell phone riding the lift?

  2. #52
    Join Date
    Sep 2001
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    The Cone of Uncertainty
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    46,990
    Quote Originally Posted by puregravity View Post
    Paging AvE to the armchair analysis phone ...
    AvE and Apetor are the two best things on Youtube.

  3. #53
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    Sep 2001
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    The Cone of Uncertainty
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    Quote Originally Posted by ill-advised strategy View Post
    was this "safety monitoring system" just somebody with eyes and a cell phone riding the lift?
    Sounds like one of the cabins hit the tower so yeah, basically.

  4. #54
    Join Date
    Oct 2003
    Location
    Seattle
    Posts
    18,027
    Quote Originally Posted by iceman View Post
    Sounds like one of the cabins hit the tower so yeah, basically.
    The audible "clang!" tipped them off.

  5. #55
    Join Date
    Feb 2011
    Posts
    1,551
    Could be ...


  6. #56
    Join Date
    Nov 2004
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    YetiMan
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    10,782
    Quote Originally Posted by Tippster View Post
    Oh, so an afternoon, a couple of buddies,
    remember though, don't call them "buddy" or they'll get all rancorous and shit.

  7. #57
    Join Date
    Sep 2006
    Location
    Fraggle Rock, CO
    Posts
    5,605
    ^^^ Huh? No kidding? So lift maintenance types perfect gender neutral pronouns too?
    Brandine: Now Cletus, if I catch you with pig lipstick on your collar one more time you ain't gonna be allowed to sleep in the barn no more!
    Cletus: Duly noted.

  8. #58
    Join Date
    Dec 2008
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    Posts
    5,128
    "hey zer, toss me that wrench"

  9. #59
    Join Date
    Jun 2009
    Location
    South of 49
    Posts
    750
    Little story ...

    I bought these best quality SS bolts from a marine supply store.
    1/4" Bolts with with plastic-loc nuts.
    Now, after install, I had to reinstall and I successfully undid most of the nuts.
    But one. The plastic-loc nut just would not budge.
    Used as small 4" rachet to undo said nut with wrist-strength applied.
    Bam. Bolt broke in half with a nice pointy break showing the rotation of the fatigued metal.
    That wasn't meant to excite you.
    Just that I was surprised how bad SS bolts were that a plastic-loc nut would bust them.

    I sure hope they don't use SS bolts with plastic-loc nuts on that thing!

  10. #60
    Join Date
    Sep 2001
    Location
    The Cone of Uncertainty
    Posts
    46,990
    It's Chinesium. It's not always bad by any means but you can't trust it. Which makes it useless, to me. When I fix something I want it to stay fixed for a while.

  11. #61
    Join Date
    May 2007
    Location
    Sandy, Utah
    Posts
    11,268
    Quote Originally Posted by iceman View Post
    It's Chinesium. It's not always bad by any means but you can't trust it. Which makes it useless, to me. When I fix something I want it to stay fixed for a while.
    Where's good ole Pittsburgh steel when you need it?

    Sent from my Pixel 2 using TGR Forums mobile app
    http://www.firsttracksonline.com

    I wish i could be like SkiFishBum

  12. #62
    Join Date
    Jan 2010
    Location
    In the swamp
    Posts
    6,524

    Vail Gondola WTF

    Glad I went Ikon. I don’t need no bolt shearing off while passing by 50’ above the ground.
    Lots of capital going into Ikonic Resorts.

  13. #63
    Join Date
    Dec 2011
    Location
    PNW
    Posts
    3,869
    Quote Originally Posted by puregravity View Post
    Little story ...

    I bought these best quality SS bolts from a marine supply store.
    1/4" Bolts with with plastic-loc nuts.
    Now, after install, I had to reinstall and I successfully undid most of the nuts.
    But one. The plastic-loc nut just would not budge.
    Used as small 4" rachet to undo said nut with wrist-strength applied.
    Bam. Bolt broke in half with a nice pointy break showing the rotation of the fatigued metal.
    That wasn't meant to excite you.
    Just that I was surprised how bad SS bolts were that a plastic-loc nut would bust them.

    I sure hope they don't use SS bolts with plastic-loc nuts on that thing!
    Many, MANY different grades of SS.

    What most likely happened was galling, threading stainless on stainless without lubrication, (never seize or light oil) can weld SS together.

  14. #64
    Join Date
    Jan 2008
    Location
    livin the dream
    Posts
    3,501
    Quote Originally Posted by gatorboy View Post
    "...after a safety monitoring system detected the issue with the bolts....." Are there sensors at each junction?
    They probably have a sensor measuring the pressure on the hydraulic system that’s keeping the cable tension. Sudden change, alarm goes off in lift ops office, shut er down!



    Sent from my iPhone using TGR Forums
    Best Skier on the Mountain
    Self-Certified
    1992 - 2012
    Squaw Valley, USA

  15. #65
    Join Date
    Jun 2009
    Location
    South of 49
    Posts
    750
    Quote Originally Posted by k2skier112 View Post
    Many, MANY different grades of SS.

    What most likely happened was galling, threading stainless on stainless without lubrication, (never seize or light oil) can weld SS together.
    The Nyloc nut with actually backed off about half a centimeter ... then it locked hard.
    Then the bolt sheared in half ...
    Plastic lock in the Nyloc literally broke the bolt.

    Was a Nyloc nut.

  16. #66
    Join Date
    Feb 2008
    Location
    Alpental
    Posts
    3,480
    Quote Originally Posted by nickwm21 View Post
    They probably have a sensor measuring the pressure on the hydraulic system that’s keeping the cable tension. Sudden change, alarm goes off in lift ops office, shut er down!



    Sent from my iPhone using TGR Forums
    There’s multiple sensors for different problems
    “I have a responsibility to not be intimidated and bullied by low life losers who abuse what little power is granted to them as ski patrollers.”

  17. #67
    Join Date
    Feb 2010
    Posts
    28,862
    Quote Originally Posted by snoqpass View Post
    There’s multiple sensors for different problems
    how often is the one that detects gremlins re-calibrated?
    .

  18. #68
    Join Date
    Feb 2008
    Location
    here and there
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    14,849
    Gremlin alarm is a once a year PM but everybody gundecks it so it was last done about 1977.
    watch out for snakes

  19. #69
    Join Date
    Feb 2010
    Posts
    28,862
    their so cute as mogwai
    .

  20. #70
    Join Date
    Jan 2009
    Posts
    739
    Quote Originally Posted by puregravity View Post
    The Nyloc nut with actually backed off about half a centimeter ... then it locked hard.
    Then the bolt sheared in half ...
    Plastic lock in the Nyloc literally broke the bolt.

    Was a Nyloc nut.
    the nylon/delrin was not the culprit. regardless most grades of ss hardware are significantly softer than coated steel ones

  21. #71
    Join Date
    Feb 2008
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    Alpental
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    3,480
    Quote Originally Posted by Todd Zander View Post
    the nylon/delrin was not the culprit. regardless most grades of ss hardware are significantly softer than coated steel ones
    Even hardened structural bolts need to tightened to specific torque settings to make the proper connection
    “I have a responsibility to not be intimidated and bullied by low life losers who abuse what little power is granted to them as ski patrollers.”

  22. #72
    Join Date
    Nov 2011
    Location
    Ontario Canada eh
    Posts
    3,490

  23. #73
    Join Date
    May 2011
    Location
    the vails
    Posts
    1,911
    A good report on the incident. They pulled the public CPTSB report.

    https://denver.cbslocal.com/2019/07/...-safety-board/

  24. #74
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    Feb 2008
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    here and there
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    Could have been a bad batch of bolts.


    They got a deal on them from China I'd wager.
    watch out for snakes

  25. #75
    Join Date
    Apr 2018
    Posts
    190
    The original pic and the latest article stating the bolts were "sheared" don't really seem to hand in hand. Any dental engineers want to expound? If there was a rotational force on the upper half,sure. But the pic shows them stretched or pulled imo

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