[modeleng] Re: Metals
- From: "Jeff Dayman" <jeffdayman@xxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Wed, 17 Nov 2004 17:49:56 -0500
Hi AJ,
EDM will certainly machine it, but will be costly. EDM will cut any metal,
BTW, even pure tungsten, tungsten carbide, nickel carbide, etc. CBN (cubic
boron nitride) tooling or diamond tooling may shift it, but again, will be
costly and you need a powerful spindle to use these cutting tools, 20 HP or
more.
You may have a chilled iron casting or a piece of Stellite.
In either case, since the green grit (silicon carbide) wheel will cut it,
you are probably dealing with some form of iron carbide which as you mention
is extremely difficult to machine with conventional tools.
Cheers, Jeff Dayman Waterloo Ontario Canada
----- Original Message -----
From: "alanjstepney" <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Wednesday, November 17, 2004 4:31 PM
Subject: [modeleng] Metals
> Over the years I have gathered several bits of metal, which must be a type
> hitherto unknown to anyone.
> Or at least, that is what I assume as it is impossible to machine by any
> technique I have ever seen, and resists every attempt to convert it into
> anything useful!
>
> One metal I have never had any problems with is cast iron.
> That is, until yesterday evening..
>
> I wanted to turn an old (50 years old +) casting into something else.
> All I needed to do, to start with, was reduce the diameter.
> Unfortunately no matter what combination of speed feed and cut I used,
> nothing would get under the skin. Even a carbide tool skated across the
> surface unless I applied so much cut that it stalled the motor.
> A file didnt mark it appreciably, and only a diamond file made a
reasonable
> impression upon it.
>
> A normal grinding wheel was useless, but a green-grit wheel did take some
> off.
>
> Having consigned it to the "might come in useful one day" box again, I
> wonder what the reason is.
> Anyone have any ideas or (polite) suggestions?
>
> Meanwhile, a piece of mild steel did what I wanted it to.
>
> alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> www.alanstepney.info
> Model Engineering, Steam Engine, and Railway technical pages.
>
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