[TheForge] Annealing Aluminum

[Craig Schaefer]

I think the finish is the problem.  Most hvac ducts aren't polished.

craigs
gresham, or

JOHN CHOBRDA wrote:

>Dave,
>	Very interesting, but now I am very confused, how come I can measure
>my skin surface (sorta brown) HVAC duct (silver in color) inside of my
>freezer (painted white)with good results? Is it just the aluminum that is
>the culprit?
>
>John C.
>
>-----Original Message-----
>From: theforge-bounces at mailman.qth.net
>[mailto:theforge-bounces at mailman.qth.net] On Behalf Of David E. Smucker
>Sent: Thursday, July 29, 2004 4:27 PM
>To: Sponsored by ABANA
>Subject: Re: [TheForge] Annealing Aluminum
>
>John, I hate to throw cold water on you idea of using a IR to measure the
>temperature of aluminum but they don't work worth SH#T for measuring
>aluminum.  They are great for dark or black metal such as steel but god
>didn't intend for man to measure the temperature of a shinny surface like
>aluminum with IR.  (Works fine if you paint the metal black).  Alcoa spent
>millions over many years working to develop a good and reliable IR -- non
>contacting temperature measure for aluminum.  They would be very useful in
>hot rolling of aluminum.  They even tried 2 wave length units but never came
>up with anything that could hold standards across a wide range of alloys and
>surface condition.  Sure you could get to 10 to 20 percent accurate but not
>anywhere the accuracy you could get on steel or black surfaces.
>
>For big chucks of metal (hot rolling, forging and extrusions) we mostly used
>two point contact measurement.
>
>For the blacksmith the good old pine stick works well.
>
>Dave Smucker
>----- Original Message ----- 
>From: "JOHN CHOBRDA" <jchob at verizon.net>
>To: <munlaw2 at hcsmail.com>; "'Sponsored by ABANA'" <theforge at mailman.qth.net>
>Sent: Thursday, July 29, 2004 10:38 AM
>Subject: RE: [TheForge] Annealing Aluminum
>
>
>  
>
>>Craig:
>>Or if you want to be more accurate, Granger Supply sells an IR
>>thermometer with a laser pointer for about $100.00 (it's guaranteed for as
>>long as you own it). It's accurate to within 2%, and I love mine, instead
>>    
>>
>of
>  
>
>>carrying around 6 or 7 different temple sticks I just point, press the
>>button, and I know the exact temperature.
>>
>>John C.
>>
>>-----Original Message-----
>>From: theforge-bounces at mailman.qth.net
>>[mailto:theforge-bounces at mailman.qth.net] On Behalf Of Ron Childers
>>Sent: Thursday, July 29, 2004 6:57 AM
>>To: 'Sponsored by ABANA'
>>Subject: RE: [TheForge] Annealing Aluminum
>>
>>Use a Temple stick.
>>
>>Ron C
>>
>>
>>On Wednesday, July 28, 2004, at 10:07 PM, Craig Schaefer wrote:
>>
>>    
>>
>>>I need to anneal some small pieces of aluminum plate.   1/8 to 3/16
>>>thickness.  I do not know the alloy.  I have oxy/acetylene at my
>>>disposal.
>>>I know that heating to 650F and air cooling is a good rule of thumb,
>>>but how do I approximate 650F with the torch?
>>>
>>>CraigS
>>>Gresham, OR
>>>
>>>      
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