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 Forum index » Taking the Puppy out for a walk » Misc
Our Dumb Mistakes
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greengeek

Joined: 20 Jul 2010
Posts: 2668
Location: New Zealand

PostPosted: Thu 31 Jan 2013, 20:03    Post subject:  

prehistoric wrote:
You wouldn't have lasted long in the environment where ....... some of those bus bars were floating at 400 volts.
True enough. I wonder what the frying time of human flesh at 400v is. 60 seconds maybe?? Mmmmm, smells like chicken...

That reminds me of another mistake I made - I was given the job of replacing the faulty "ON/OFF" switch in an 80 column card punch and I happily yanked the spade wires off the back of the switch - having forgotten to unplug the cord from the wall. Zzzzzt.

I managed to throw the switch right across the room and swore like a trooper, much to the customers amusement. Lesson learned.
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puppyluvr


Joined: 06 Jan 2008
Posts: 3223
Location: Chickasha Oklahoma

PostPosted: Thu 31 Jan 2013, 20:31    Post subject:  

Very Happy Hello,
LOL...
I recently had a box go down after moving it.. Video failed completely.. Nada..
Had a geforce card in it, which I assumed had failed.. Removed it and attached to the onboard intel, reset the jumpers, and rebooted.. Still nothing at all.. Not even the bios framebuffer.. Crap.. Removed the disks, the cd/dvd, and replaced the ram, to no avail.. Checked all the jumpers, the ram slots, even tested the MB clip on the power supply.. Only after giving up in disgust after a few hours, when I removed the tower from the desk, did I realize I had plugged in the wrong monitor cord.. Rolling Eyes
I once turned off the wrong breaker to a 440 volt 60hp power source, and then stuck a screwdriver into a box, and blew the end off it, and my finger..
The video card thing still pissed me off more.... Wink

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8-bit


Joined: 03 Apr 2007
Posts: 3393
Location: Oregon

PostPosted: Thu 31 Jan 2013, 23:28    Post subject:  

At one time, I worked as a millwright at a small lumber mill that made agricultural stakes.
I was also a regular worker there since it did not require a full time millwright.
I had another worker complain to me that he was being shocked by a machine he was feeding.
I touched the machine and did not get shocked so I thought I would investigate further.
When I did not get shocked, I was standing on a wooden floor.
I then went to clean out some wood on a trough conveyor and happened to touch the machine in question.
I now know what it feels like to be the ground for a 440 volt 3phase circuit.
It turned out that when the mill was originally wired, the conduit was used as a ground.
The conduit had separated and wore through one of the power wires.
And with the conduit separated the machine had what they would call a floating ground.
So anyone that was grounded and happened to touch the machine completed the circuit.
Not a good thing!

I had the machine then shut down, locked out at the breaker, and established a good ground for it as well as repairing the bad wiring.
But I did learn that when one goes to test that a meter is a lot safer than touching the machine to check for a short!

I guess you could say I got recharged that day!
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lwill


Joined: 13 Jun 2008
Posts: 173
Location: City Of Lights

PostPosted: Fri 01 Feb 2013, 00:23    Post subject:  

Not Puppy, but linux.
I updated to Fedora 18 with KDE on one machine and since then the "device notifier" applet would always ask for root password to mount cd/dvd/usb/sd drives when inserted. Never had before. No biggy, but annoying.
Spent half the day searching for reasons. Permissions, settings, mounting settings. Lots of google.
Turns out in the "default applications", the default file manager was set to "Konqueror ROOT" for some reason. I have an icon on the tool bar set to open my home folder that uses Dolphin (which is the normal fedora default) so I never try to open a directory directly and never actually used the "default" file manager.
.
.
On further thought, I may have done it to myself at some point. I was working with Android / linux on a Mele 2000 using sd cards to transfer stuff and needed to be root to modify files on them.

Still half a day I lost fixing it!!
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prehistoric


Joined: 23 Oct 2007
Posts: 1304

PostPosted: Fri 01 Feb 2013, 11:57    Post subject:  

lwill wrote:
...Still half a day I lost fixing it!!
Only half a day? Hardly worth mentioning.

How about the better part of a stressful week?

This story relates to the earlier business about high voltage in a strange way, we were simulating a device which used a traveling-wave tube -- because not only did these things cost about $15,000 apiece, there was a real problem of losing students if they reached into the case without turning the power off. (We're talking thousands of volts, with kilowatts of power.) It also has some relevance to assumptions about the polarity of ground.

Naturally, we were dependent on an expert instructor for testing our simulated device. Nobody wanted to fool with the real thing, even if we were allowed to. (The device was classified, which made it hard to access data about it.) The one expert we had that week told me I had one control "backwards" on the simulator, as opposed to the real device. I questioned him about this with a graph of the performance of some parameter versus voltage on that knob in front of us. When I thought I understood, I went off and reprogrammed. This was not a simple task, because of other factors that would take us too far afield. Any substantial change cost me hours of work. I went through this drill three times. Each time it remained "backwards", and I became more confused.

On the last day of this fiasco I walked into the room housing our simulator, and saw a technician resoldering the wires on the potentiometer controlling the (simulated) voltage which was the problem. It turned out what our expert meant by "backwards" had nothing to do with the voltage on the graph; he meant the real knob rotated counterclockwise to increase voltage. My original program had been correct, but under pressure of all the changes made in a hurry I was no longer sure which version I should use.

I ended up reprogramming that control from scratch one last time. It only took me a little over an hour, because of all the practice I had had. A simple question about clockwise versus counterclockwise could have saved most of a week. Fortunately, errors with simulated voltages don't kill people.
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greengeek

Joined: 20 Jul 2010
Posts: 2668
Location: New Zealand

PostPosted: Fri 01 Feb 2013, 14:07    Post subject:  

prehistoric wrote:
...he meant the real knob rotated counterclockwise to increase voltage.
Interesting the assumptions we make. My guts tells me that it is just plain "wrong" to have the voltage increasing when you turn the knobby counterclockwise - but there is no real justification for my rationale. Whoever wired up the real knobby in that direction was a knobby themselves.
Smile
Or maybe thats just how things go in the northern hemisphere? Like bathwater draining the wrong way...

EDIT: I suppose if the knobby was marked "ATTENUATION" then it MIGHT be ok to be decreasing the voltage in a clockwise direction. Otherwise its just not ok to do that. Never. Not ever. (Unless there's a good reason). Confused
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puppyluvr


Joined: 06 Jan 2008
Posts: 3223
Location: Chickasha Oklahoma

PostPosted: Fri 01 Feb 2013, 20:47    Post subject:  

Very Happy Hello,
CW is on, CCW is off..
"righty tighty, lefty loosey" (except old Mopar.. Rolling Eyes )

As a teenager, while hunting deer with my younger step-brother Bobby, I witnessed him urinating on an electric cattle fence... Shocked
After the convulsions went away, and the screaming subsided, and I quit laughing enough to check, he seemed to be OK... Rolling Eyes

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prehistoric


Joined: 23 Oct 2007
Posts: 1304

PostPosted: Sun 03 Feb 2013, 11:36    Post subject:  

greengeek wrote:
...Interesting the assumptions we make. My guts tells me that it is just plain "wrong" to have the voltage increasing when you turn the knobby counterclockwise - but there is no real justification for my rationale. Whoever wired up the real knobby in that direction was a knobby themselves.
Smile
Or maybe thats just how things go in the northern hemisphere? Like bathwater draining the wrong way...

EDIT: I suppose if the knobby was marked "ATTENUATION" then it MIGHT be ok to be decreasing the voltage in a clockwise direction. Otherwise its just not ok to do that. Never. Not ever. (Unless there's a good reason). Confused
There was an excellent reason -- all the other controls had the opposite polarity. The graph I was using as a reference didn't mention that. I suppose they just assumed anyone familiar with the device would know.

I will note, in passing, that modern traveling-wave tubes are designed with the idea that it is ridiculous to have a mere human technician directly controlling each parameter. There are sophisticated circuits between people and those adjustments. That simulator was scrapped long ago.
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prehistoric


Joined: 23 Oct 2007
Posts: 1304

PostPosted: Sun 03 Feb 2013, 11:40    Post subject:  

puppyluvr wrote:
... As a teenager, while hunting deer with my younger step-brother Bobby, I witnessed him urinating on an electric cattle fence... Shocked
After the convulsions went away, and the screaming subsided, and I quit laughing enough to check, he seemed to be OK... Rolling Eyes
Does he have any children?

I know of an entire fraternity which is reproductively challenged as a result of an initiation involving pissing on a running lawnmower.
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Dewbie

Joined: 15 Apr 2010
Posts: 1783

PostPosted: Sun 03 Feb 2013, 20:00    Post subject:  

prehistoric wrote:
Quote:
I know of an entire fraternity which is reproductively challenged as a result of an initiation involving pissing on a running lawnmower.

An electric mower?
Or was it blade-related? Rolling Eyes
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Amgine


Joined: 21 Sep 2011
Posts: 233
Location: Washington State

PostPosted: Sun 03 Feb 2013, 22:05    Post subject:  

prehistoric wrote:
puppyluvr wrote:
... As a teenager, while hunting deer with my younger step-brother Bobby, I witnessed him urinating on an electric cattle fence... Shocked
After the convulsions went away, and the screaming subsided, and I quit laughing enough to check, he seemed to be OK... Rolling Eyes
Does he have any children?

I know of an entire fraternity which is reproductively challenged as a result of an initiation involving pissing on a running lawnmower.


Our best and brightest, our college educated. Rolling Eyes

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infromthepound

Joined: 12 Jun 2009
Posts: 136

PostPosted: Mon 04 Feb 2013, 02:22    Post subject:  

In the early days of USB the connecting cables were individual instead of one block and not that well marked. (Stupid idea, some still are).
It was not that obvious how to do it on one motherboard and I connected power and ground the wrong way round.
Smoke, and I needed another motherboard.
JB
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prehistoric


Joined: 23 Oct 2007
Posts: 1304

PostPosted: Mon 04 Feb 2013, 11:36    Post subject:  

Dewbie wrote:
[...An electric mower?
Or was it blade-related? Rolling Eyes
Just in case you are serious, it was a gasoline burning mower. The problem was the spark plug.

I also have a story about an extremely embarrassing incident which happened to a guy in the army. I got it from the man in the next hospital bed. He was out on an artillery range at Ft. Sill when he pulled the pissing on an electric fence stunt. (They didn't keep cattle there, but they did have buffalo. Maybe these require stronger shocks.)

He was alone at the time. This meant he had to get in the jeep with his pants unzipped, and drive himself to the hospital. By the time he got there swelling meant he was in no condition to either walk or cover himself. He drove up to the emergency room entrance and leaned on the horn. Then he had to explain why he was there before they called for MPs.

Something that happened in the confusion of the accident required stitches. This meant he had to avoid erections for a week or two. He was given a can of Freon to cool things off. One problem developed when nurses from other floors came to visit my friend in the next bed. (He was popular with the ladies.) To be polite, they tried to pay a little attention to the man in the other bed, who really didn't want to explain his problem. He had to ask them to leave without giving much explanation in order to use the Freon.
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Dewbie

Joined: 15 Apr 2010
Posts: 1783

PostPosted: Wed 06 Feb 2013, 00:58    Post subject:  

prehistoric wrote:
Quote:
Just in case you are serious, it was a gasoline burning mower. The problem was the spark plug.

I also have a story about an extremely embarrassing incident which happened to a guy in the army...he pulled the pissing on an electric fence stunt.

I believe the clinical term (in both cases) is Erectrocution.Twisted Evil
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Karl Godt


Joined: 20 Jun 2010
Posts: 3972
Location: Kiel,Germany

PostPosted: Mon 25 Feb 2013, 11:32    Post subject:  

Colonel Panic wrote:
When logged in as root on my Pentium 100 running Basic Linux, I tried to erase a directory using the rm command and wiped the whole drive instead. I make full backups to USB drive and DVD now (I didn't then).


Did such similar with one Xubuntu full installation . Must say i don't miss it . Laughing

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