Gravdigr's Questions - Page 3

Sheldonrs · 01-23-2014, 05:56 PM

Quote:

Originally Posted by DanaC

That doesn't work. I change it to a smaller fraction, like 1/3 - 'resulting in one third of its mass'

It has to be 1/81st, surely?

Don't call him Shirley!

Gravdigr · 01-27-2014, 03:48 PM

If poison goes out of date, is it more, or, less poisonous?

And, yes, I know it will still be poison, more or less.

fargon · 01-27-2014, 04:01 PM

Quote:

Originally Posted by glatt

I don't know about that, but kids today say "one fourth" instead of "one quarter." At least in my hood. And I can see how that makes sense.

But you would think they would also say "one second" instead of "one half," but they don't. They're still saying "one half." "One second" might be confused with "one sixtieth" because there are sixty seconds in a minute, and sixty seconds in a degree.

I'd say 1/81 is "one eighty-first."

There are 60 seconds in a minute of angle, and 60 minutes in a degree.

Gravdigr · 01-27-2014, 04:06 PM

Quote:

Originally Posted by fargon

...and 60 minutes in a degree.

Is this why time seems to stand still when it's really hot?

glatt · 01-27-2014, 04:12 PM

Quote:

Originally Posted by fargon

There are 60 seconds in a minute of angle, and 60 minutes in a degree.

Or course you are right! Thanks for refreshing my memory on that.

orthodoc · 01-28-2014, 08:02 PM

Yes, 1/81 is 'one eighty-first'.

Re poison ... depends on the poison. Some break down and lose potency (but no one here would know about that, right?). Others remain lethal to the end.

lumberjim · 01-28-2014, 08:39 PM

how about iocaine powder?

orthodoc · 01-28-2014, 08:46 PM

That requires slow, careful acclimatization, patience and appreciation needed; then you defeat the egotist (inconceivable!!) and win the Princess.

Spexxvet · 01-29-2014, 09:15 AM

thread drift: my favorite line, which was prescient

Quote:

You fool! You fell victim to one of the classic blunders - The most famous of which is "never get involved in a land war in Asia" - but only slightly less well-known is this: "Never go in against a Sicilian when death is on the line"! Ha ha ha ha ha ha ha! Ha ha ha ha ha ha ha! Ha ha ha...

Gravdigr · 02-03-2014, 01:47 PM

Why are circuit boards (especially the older ones) green?

infinite monkey · 02-03-2014, 02:59 PM

That's solder mask, protecting the circuitry (etched copper) from scratches and from solder wicking and shorts and corrosion. When producing circuit boards (I was QA supervisor at a high tech board manufacturer back in the day) the copper layer is etched into the circuitry pattern, then solder mask applied, then sent through a solder bath system with air knives to coat the exposed copper surfaces in solder, those surfaces being either through-hole or surface mount areas for components (typically a tin/lead alloy.) The mask prevents a big old mess of solder covered copper for that process.

That's it in a nutshell anyway. The green mask isn't always used: we made some boards coated in gold plating, and some the exposed laminate was left that way. Depends on the application and intricacy of the board. Don't know why green is the color, but when I worked in the industry it was all green.

tw · 02-04-2014, 12:40 AM

When working with circuit boards, you never get out of the shop. It's the only green you get to see.

Clodfobble · 02-04-2014, 08:47 AM

Quote:

Originally Posted by infinite monkey

That's solder mask, protecting the circuitry (etched copper) from scratches and from solder wicking and shorts and corrosion. When producing circuit boards (I was QA supervisor at a high tech board manufacturer back in the day) the copper layer is etched into the circuitry pattern, then solder mask applied, then sent through a solder bath system with air knives to coat the exposed copper surfaces in solder, those surfaces being either through-hole or surface mount areas for components (typically a tin/lead alloy.) The mask prevents a big old mess of solder covered copper for that process.

That's it in a nutshell anyway. The green mask isn't always used: we made some boards coated in gold plating, and some the exposed laminate was left that way. Depends on the application and intricacy of the board. Don't know why green is the color, but when I worked in the industry it was all green.

Holy shit, infi. This post was amazing. I love it when I discover that someone is secretly an expert in something you wouldn't expect. Like classicman and mushrooms.

DanaC · 02-04-2014, 08:54 AM

Inf hides so many lights under a bushel it's damn near daylight under there :P

infinite monkey · 02-04-2014, 09:01 AM

Does my desperate lifestyle show when I say you two just made my day?

01-27-2014, 03:48 PM	#32
Gravdigr The Un-Tuckian Join Date: Apr 2007 Location: South Central...KY that is Posts: 39,517	*New Question* If poison goes out of date, is it more, or, less poisonous? And, yes, I know it will still be poison, more or less. __________________ These statements have not been evaluated by the FDA, EPA, FBI, DEA, CDC, or FDIC. These statements are not intended to diagnose, cause, treat, cure, or prevent any disease. If you feel you have been harmed/offended by, or, disagree with any of the above statements or images, please feel free to fuck right off.

01-28-2014, 08:02 PM	#36
orthodoc Not Suspicious, Merely Canadian Join Date: Oct 2006 Posts: 3,774	Yes, 1/81 is 'one eighty-first'. Re poison ... depends on the poison. Some break down and lose potency (but no one here would know about that, right?). Others remain lethal to the end. __________________ The greatness of a nation and its moral progress can be judged by the way its animals are treated. - Ghandi

01-28-2014, 08:39 PM	#37
lumberjim I can hear my ears Join Date: Oct 2003 Posts: 25,571	how about iocaine powder? __________________ This body holding me reminds me of my own mortality Embrace this moment, remember We are eternal, all this pain is an illusion ~MJKeenan

01-28-2014, 08:46 PM	#38
orthodoc Not Suspicious, Merely Canadian Join Date: Oct 2006 Posts: 3,774	That requires slow, careful acclimatization, patience and appreciation needed; then you defeat the egotist (inconceivable!!) and win the Princess. __________________ The greatness of a nation and its moral progress can be judged by the way its animals are treated. - Ghandi

02-03-2014, 01:47 PM	#40
Gravdigr The Un-Tuckian Join Date: Apr 2007 Location: South Central...KY that is Posts: 39,517	*New Question* Why are circuit boards (especially the older ones) green? __________________ These statements have not been evaluated by the FDA, EPA, FBI, DEA, CDC, or FDIC. These statements are not intended to diagnose, cause, treat, cure, or prevent any disease. If you feel you have been harmed/offended by, or, disagree with any of the above statements or images, please feel free to fuck right off.

02-03-2014, 02:59 PM	#41
infinite monkey Person who doesn't update the user title Join Date: Mar 2011 Posts: 13,002	That's solder mask, protecting the circuitry (etched copper) from scratches and from solder wicking and shorts and corrosion. When producing circuit boards (I was QA supervisor at a high tech board manufacturer back in the day) the copper layer is etched into the circuitry pattern, then solder mask applied, then sent through a solder bath system with air knives to coat the exposed copper surfaces in solder, those surfaces being either through-hole or surface mount areas for components (typically a tin/lead alloy.) The mask prevents a big old mess of solder covered copper for that process. That's it in a nutshell anyway. The green mask isn't always used: we made some boards coated in gold plating, and some the exposed laminate was left that way. Depends on the application and intricacy of the board. Don't know why green is the color, but when I worked in the industry it was all green. Last edited by infinite monkey; 02-03-2014 at 03:11 PM.

02-04-2014, 12:40 AM	#42
tw Read? I only know how to write. Join Date: Jan 2001 Posts: 11,933	When working with circuit boards, you never get out of the shop. It's the only green you get to see.

02-04-2014, 09:01 AM	#45
infinite monkey Person who doesn't update the user title Join Date: Mar 2011 Posts: 13,002	Does my desperate lifestyle show when I say you two just made my day?

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