Netheads,
The following statement by Don Reid is the best advice I have ever seen
when it comes to using a band saw for cutting to the proper length or a
grinder for rounding corners.
"If you can hold the steel in your bare hand while you are making
your
part(s), then the you have not caused any significant heat related
change
in the mechanical properties of the steel."
I have no answer except go very slow and dip the part in water often.
When it comes to drilling the holes, I used the following method. Fill a
small pan with water and put about a 5 inch length of 2" X 4" wood block in
the pan. Lay the part to be drilled in the block and push the block and
part down so you can do the drilling with the part under water. The part
needs to be only about 1/2 inch under. Using this method it is easy to
control the tempture of the part being drilled and if the water starts to
warm up, put in some ice cubes. The part being drilled should never get so
hot that you cannot hold it with your bare hand so the temper properties
will remain the same.
Bob Stone, Harker Heights, Tx
rsto...@hot.rr.com
----- Original Message -----
From: "Donald Reid" <donr...@peoplepc.com>
To: "KRnet" <kr...@mylist.net>
Sent: Tuesday, June 07, 2005 8:43 AM
Subject: Re: KR> 4130 steel
> At 03:38 PM 6/6/2005, you wrote:
>>If I buy strips of 4130 steel of the correct thickness from Aircraft
>>Spruce, can I use them as they are to make WAFs, or is there any treatment
>>(other that surface treatment) that I must apply?
>
> You would get the steel in a Normalized (N) condition. After the milling
> process, the steel is raised to approximately 100 degrees F above its
> critical temperature and then allowed to cool in still air ( meaning
> slowly). The critical temperature is where the steel is no longer
> magnetic. It relieves the milling stresses and helps prevent subsequent
> failure. My generic reference manual, Marks' Standard Handbook For
> Mechanical Engineers, does not list 4130, but the typical temperature for
> carbon steel is 1500-1700 degrees F. Annealing temperature is typically
> lower by 100 to 500 degrees.
>
> If you can hold the steel in your bare hand while you are making your
> part(s), then the you have not caused any significant heat related change
> in the mechanical properties of the steel. If you do get it too hot to
> hold, then let it cool slowly in still air and it will be fine.
>
>
>
> Don Reid - donreid "at" peoplepc.com
> Bumpass, Va
>
> Visit my web sites at:
>
> AeroFoil, a 2-D Airfoil Design And Analysis Computer Program:
> http://aerofoilengineering.com
>
> KR2XL construction: http://aerofoilengineering.com/KR/KR2XL.htm
> Aviation Surplus: http://aerofoilengineering.com/PartsListing/Airparts.htm
> EAA Chapter 231: http://eaa231.org
> Ultralights: http://usua250.org
> VA EAA State Fly-in: http://vaeaa.org
>
>
>
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