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  1. #1
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    Default What did you learn today?

    While grinding some welds on my plate table today I learnt that even if a battery has been sitting for a week since it was charged/discharged it may still have some hydrogen inside. Luckliy my tool and cutter grinder finally did something useful and stopped what little(it could have been much much worse) acid was splashed out.

    Stuart

  2. #2
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    Jun 2008
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    Victoria, Australia
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    Hi Stuart,

    Good safety tip... place the tool and cutter grinder so that it acts as a safety shield....

    I managed to set fire to the jeans I was wearing last week I was using a 9" angle grinder when the leg of the jeans caught fire and burned a hole in them, I thought they were a cotton fabric, but when I used my hand to pat the fire out, the melted plastic burnt my hand.. must be some kind of polyester...

    So, there's another lesson, make sure you aren't wearing clothing that melts when it catches fire...

    Regards
    Ray

  3. #3
    Join Date
    Apr 2010
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    Rural Victoria
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    What did I learn today? Perhaps just to say 'bugger it' (I wanted to use a stronger expletive here).

    Maybe as I get older I will save perfection for 'special' projects, and use 'okay' for general stuff, because 'okay' gets stuff finished.

    Here is a rebuilt trolley for my Rowenarc Mig, before and after:

    Not a good shot, but you can see the 'T' handle which went down to the outrigger which in turn was meant to steer two small wheels on a pivot.... another ruptured vertebral disc waiting to happen!!!

    http://i1033.photobucket.com/albums/...n/CIMG4274.jpg

    Reworked trolley with Fallshaw castors on the front and rear axle with original wheels lifted 40 mm.

    http://i1033.photobucket.com/albums/...n/CIMG4801.jpg

    Sometimes you don't need to even try and you punch out a good weld.

    http://i1033.photobucket.com/albums/...n/CIMG4800.jpg.

    Perhaps I have learnt today (it is a gradual process....) that although the journey is important, you have to get things FINISHED!!! It is time that I left "UNFINISHED PROJECT MAN" behind in the dark streets of Gotham City....

  4. #4
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    Mar 2010
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    Nth Qld
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    Default

    Definitely a "Bum Puckering Moment", seen some spectacular photos of phone exchange battery repair gone wrong: the exploding cell will set off the ones next to it like a string of firecrackers ...only with clear acrylic shrapnel.

  5. #5
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    Nov 2008
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    Perth WA
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    Stu,

    How about an update on the little tool and cutter grinder.

    BT

  6. #6
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    Graziano,
    Indeed, it wasnt much of a pop but I was as far out of the shed as the lead on the grinder would let me get pretty quickly for an old guy lol


    Hi Bob,
    Well an update is easy, it hasnt moved an inch, I havent even looked at it. Though I think the shed is slowly getting there so maybe one day soon. The worse thing about the machine ATM is that it has very little horizontal flat surface for the amount of floor space it takes up.

    Stuart

  7. #7
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    Stuart, great idea for a thread title. It's only 8 am so I haven't learned anything yet, but I've also had the clothing on fire experience, and it was also a 9" angle grinder, but in my case it was my sleeve. I can assure you cotton burns very nicely. I still have a faint scar on my upper arm. It was a 'minor' burn but very painful.

  8. #8
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    Southern Highlands NSW
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    When I were a lad my science teacher demonstrated how hydrogen burns slowly in the presence of oxygen, with a nice blue flame.
    I heard that lead/acid batteries emit hydrogen when charging, so with a matchstick...
    My ringing ears and ruined clothes led me to investigate this phenomenum.
    I learnt that hydrogen mixed with a lot of oxygen can explode rather than burn slowly.
    A charging battery emits hydrogen, PLUS oxygen.

    Jordan

  9. #9
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    Jun 2008
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    Quote Originally Posted by nadroj View Post
    When I were a lad my science teacher demonstrated how hydrogen burns slowly in the presence of oxygen, with a nice blue flame.
    I heard that lead/acid batteries emit hydrogen when charging, so with a matchstick...
    My ringing ears and ruined clothes led me to investigate this phenomenum.
    I learnt that hydrogen mixed with a lot of oxygen can explode rather than burn slowly.
    A charging battery emits hydrogen, PLUS oxygen.

    Jordan
    You too....
    Warning Disclaimer

  10. #10
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    Hi Bryan,
    I've also done the grinding thing, long ago with a cutting disc I burnt through my overalls, my jeans and a fair bit of skin on my knee before I stopped to have a look.
    Funniest cotton shirt incident I was involved in was flicking my lighter against the wrist of a mate and having a wall of flame shoot up his arm, luckily other than shock no damage was done.

    If I recall correctly hydrogen and oxygen if mix just right will ignite/explode when exposed to UV light. (it must be true Wikki agrees with me lol http://en.wikipedia.org/wiki/Hydrogen)

    Stuart

  11. #11
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    My retarded trick for today was cutting with the face mill running backwards.... Was using the right angle attachment on the turret mill and when the machine is running forward, it runs backwards... I was wondering why it was chattering during the cut...
    Gold, the colour of choice for the discerning person.

  12. #12
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    Quote Originally Posted by .RC. View Post
    My retarded trick for today was cutting with the face mill running backwards.... Was using the right angle attachment on the turret mill and when the machine is running forward, it runs backwards... I was wondering why it was chattering during the cut...

    You ain't no orphan RC.

  13. #13
    Greg Q's Avatar
    Greg Q is offline Just some guy, only bigger.
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    I was splitting firewood this morning for the first time in yonks. I relearned that sometimes you split the wood, and sometimes the wood splits you.

    Bloody Greg
    It's all part of the service here at The House of Pain™

  14. #14
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    Ouch!!

    Just about weather for the fire here as well, 14C atm

    Bl**dy global warming............

  15. #15
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    Littlehampton, SA
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    Quote Originally Posted by Bryan View Post
    Stuart, great idea for a thread title. It's only 8 am so I haven't learned anything yet, but I've also had the clothing on fire experience, and it was also a 9" angle grinder, but in my case it was my sleeve. I can assure you cotton burns very nicely. I still have a faint scar on my upper arm. It was a 'minor' burn but very painful.
    Yep. I'll put my hand up for the 9" grinder trick. In my case it was through the dustcoat, shirt, trousers and jocks before I felt it. Only just managed to put it out before it was "great balls of fire".

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