HomeRoast Digest


Topic: D'oh! (8 msgs / 239 lines)
1) From: Allon Stern
So, with a whirlwind of distraction from kids, I ended up leaving my  
heat gun outside overnight. In the rain.
Ugh.
Took it apart and blew out the guts with the air compressor. Hopefully  
no major damage.
I've been meaning to do this to get bits of chaff out....I didn't mean  
to wash it.
Hopefully there's no paper insulation anywhere. I'll bring it up  
slowly and carefully. At least if I did damage it, I can get  
replacement parts. It's a Master Appliance PH-1100.
I'm pretty impressed with how easy this HG is to take apart. The  
turbine assembly is two parts which snap together solidly.
At least I still have the iRoast and Z&D to fall back on....
-
allon
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2) From: Brian Kamnetz
Allon,
I have a Master Appliance 751B. A while back the fan quit. I was able
to send it back to the factory for a general rebuild for $40, plus the
$10 it cost to send it there (return shipping was included in the
$40). I think it would be very difficult to buy parts for this price.
You probably don't want to send yours in to the factory, given your
mechanical/electrical expertise, but it was a very good option for me
and might be for others, so I thought I would mention it.
Good luck with your heatgun. I hope you are able to bring it back from
the brink. I recall that Pecan Jim's heatgun was left outside for an
extended period when he was sick, and it sounded from Jim's comments
that the gun was ruined, though I don't recall specifically what went
kaput on his heatgun.
Brian
On Sun, Nov 1, 2009 at 1:04 PM, Allon Stern  wrote:
<Snip>
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3) From: Michael Wascher
I was involved with restoration/repair/reuse of electronic/electrical
equipment that had been submerged in saltwater.
The first step we used, removal of salt using copious amounts of fresh
water, isn't required by you.
The next step was to dry the items at low heat (we used environmental
chambers but a low oven should be fine). We'd leave the pieces in an oven at
40-50 decrees Celsius (100-125 degrees Fahrenheit. for 2-3 days. Use a
convection oven if you have one, the fan will provide even heat.
That'd dry it enough to allow the items to be tested & repaired.
--MikeW
"I have yet to see any problem, however complicated, which, when you looked
at it in the right way, did not become still more complicated."  --Poul
Anderson
On Sun, Nov 1, 2009 at 12:04 PM, Allon Stern  wrote:
<Snip>
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4) From: Allon Stern
On Nov 1, 2009, at 12:27 PM, Michael Wascher wrote:
<Snip>
yah, I've washed my fair share of electronics, usually salvaging  
someone else's laptop after they spilled a beverage into it.
Typically I've washed it down with water, rinsed with distilled, then  
a rinse with isopropyl alcohol and hit with a hair dryer.
For this, I'm mostly concerned about the motor, and maybe the switch.  
Nichrome wire is apparently pretty inert, but the copper and steel in  
the motor and switch might suffer.
If I had my variac here, I'd run it at low power for a bit to dry it  
out, but it's a work from when I lent it to someone to bring up an old  
radio power supply.
Oven is a good idea. I will do that, for a bit anyway.
-
allon
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5) From: Michael Wascher
Having had it sit out in the damp air is worse than total submersion. We'd
recover equipment that was on the sea bottom for days to months -- it'd be
fine until it hit the air when corrosion would start. Recovered equipment
was kept in containers filled with water, sea water if no other was
available, until the cleaning process could begin.
"I have yet to see any problem, however complicated, which, when you looked
at it in the right way, did not become still more complicated."  --Poul
Anderson
On Sun, Nov 1, 2009 at 2:19 PM, Allon Stern  wrote:
<Snip>
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6) From: raymanowen
"a Master Appliance 751B. A while back the fan quit. I was able
to send it back to the factory for a general rebuild for $40, plus the
$10 it cost to send it there (return shipping was included in the
$40). I think it would be very difficult to buy parts for this price."
A.- I rebuilt three of the 301's that had been used for striking devices at
Op Images. Cost $50 total for the parts from W.W.Grainger parts depot in Chi
Town. I ordered the 1800-watt heaters for all three, along with some nose
extensions and ceramic heater forms.
B.- The Master heat guns are bullet proof, but Op didn't want to wait even 2
days for over nighted parts and my fixation. They saved 1 day and got three
new ones from WWG on Paris Street, bought all the parts and gave me the
three oldies, to boot. (Admit- they looked like Hell before I fixed)
C.- A trip through a 200F oven for a couple of hours BEFORE YOU TURN IT =
ON
would dry out a soaked heat gun very nicely. A stopped motor is a moot
point- they all have brushes. Stretch the brush springs a little to get the
old brushes back in contact with the commutator, and you're back in business
until you get the new brush set and springs.
Meanwhile, don't dress the commutator until you get the new brushes
installed- the old brushes were perfectly "lapped in." If it's really
terribly burnt from arcing to the brushes, a little emery paper would
recover a smooth surface and a light awl scrape would dress the mica
insulation between the segments.
Finish dress with a light flat file/ emery paper. For the $40, you probably
got a nearly brand-new heat gun. For $50, I got three, and gave 'em away. As
of 20 Sep, one of my screen printing clients called and mentioned her heat
gun was running fine after 12 years.
"Ray, you wouldn't believe what else I've been doing with that heat gun-"
Carolyn builds her own race engines- "The valve train push-rods take forever
to get up to racing temperature after a rebuild, and the P&G dial indicator
doesn't know the engine's still cool, or cooling down after a hard warm-up
run. Valve bounce, no good!"
"Heh, heh, heh- you wouldn't believe what I do with heat guns, Carolyn...
and I probably ought to get you a new set of brushes by now."
"Been there, done that, Ray- twice!"
"You brute-"
Cheers, Mabuhay, Iechyd da -RayO, aka Opa!
-- =
Persist in old ways; expect different results - suborn Insanity...
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7) From: Phil Palmintere
I can't resist telling you about my own experience with an electronic device
inadvertently subjected to moisture, even though it is OT - not coffee
related.
A decade ago, I fumbled my cell phone while driving my car, and plop-plop,
fizz-fizz, it landed in my Chocolate Milk Shake.  A few days later, after
rinsing its innards with distilled water and letting it dry, the phone
worked -- sort of.  It could dial any of the telephone numbers in its
memory, but several numerals wouldn't register if you pushed them to dial a
new number.
Oh well.
My admin ordered me a new cell phone (same Nokia model), and I called AT&T
to have them switch my telephone number to the new cell phone.  
So far, so good.
I had my admin call my cell phone number to make sure everything was A-OK --
but BOTH cell phones rang!  I answered the call on the new cell phone and it
was fine.  I pushed the answer button on my old Chocolate Milk Shaked cell
phone, and I lo and behold, I was talking to my admin!  One cell phone on my
left ear and the other on my right ear and I was listening in stereo!  The
same thing was true on an outbound cell phone call!
I know cell phone companies say this can't happen, but it did.
It occurred to me file an invention disclosure at work as the first step
toward a patent application for a "Method of Using a Chocolate Milk Shake to
Expand Cellular Telephone Service to More Than One Physical Cellular
Telephone."   :-)
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8) From: Allon Stern
On Nov 1, 2009, at 12:04 PM, Allon Stern wrote:
<Snip>
Well, reassembled it last night and it works just fine :)
Phew. Brazil Ipanema, here i come :)
-
allon
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