Re: [CAD_CAM_EDM_DRO] Re:DRILL ROD FOR LINEAR WAYS

There's a simpler, cleaner method on the tempering. First, clean off whatever
carbon, or other gunk might be on the steel. Then, turn your kitchen oven on,
"bake", set it to 350 d3egrees F., set the steel on the rack, and come back two
hours later. Remove the steel, and let it cool. Done this way, the steel
retains its hardness, while the brittleness is relieved. No fuss, no bother,
no Portland cement.

Bill

On Mon Feb 28 16:30:10 2005 Bruce Pigeon wrote:

>I realize this is not on topic, but can be useful in this process.
>
>When I want to harden a piece of heat treatable steel I heat it until a
>magnet will not stick to it. Then I quench it in water or oil. Cherry red
>is not definite enough, but the magnet is. The old machinist that taught me
>said when metal looses it magnetism it will accept it's maximum hardness.
>
>If you want to temper it, reheat it to 500 (or the specs for the grade of
>steel being tempered) use a heat stick. Any good steel spec book will give
>the heat treat range. He taught me to use different shades of blue/black to
>determine the temp.. Then drop it in a bucket of Portland cement and let it
>sit overnight. I use two plates of metal to separate the cement so that the
>part will go deep into the cement and be completely buried when I pull out
>the sheets of metal. Many times the parts will still be warm the next day.
>
>
>Bruce
>
>-------Original Message-------
>
>From: CAD_CAM_EDM_DRO@yahoogroups.com
>Date: 02/28/05 14:43:31
>To: CAD_CAM_EDM_DRO@yahoogroups.com
>Subject: [CAD_CAM_EDM_DRO] Re:DRILL ROD FOR LINEAR WAYS
>
>
>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Roger Hampson"
><r_.hampson@t...> wrote:
>> Hi Allan,
>>
>> Over here in the UK we can obtain a specific steel bar that is
>centerless
>> ground to fine tolerances usually 0.5 thou 0.0005" that can be
>hardened by
>> heating to cherry red and quenching in water.
>
>There are three common varieties. We call them something hardening
>to represent what medium is used to harden them.
>
>one is water, one is oil and the other is air. Each has it's own
>properties. All move a little when heated so the soft stuff you buy
>is nice for a lot of stuff. but it is too soft for prolonged use with
>ball slides. Then again, it is cheap enough to replace a couple times.
>
>Dave


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