Re: [CAD_CAM_EDM_DRO] Re: newbie Question

Hi, stellite, yep good stuff, some people were calling "Rexalloy" stellite
when it is actually Tan-Tung Tantalum Tungsten, most made by VR Wesson under
tantung 144....tantung is tuff and strong yet with a little care on a
grinding wheel they last for ever and can be run with the tip red hot and
not destroy the hardness, melting point is about 5000 deg f. cul brian f.

----- Original Message -----
From: "Jon Elson" <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, September 26, 2002 2:35 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: newbie Question


> Ken Retallick wrote:
>
> > Carbide maybe eventually. at this stage just the standard HSS cutters.
>
> I have basically given up on HSS for most work, and no longer buy it.
> I guess I got spoiled and started learning with a cache of old Stellite
> cutters. They lasted FOREVER! I thought the WERE HSS, but they
> are much better. Stellite is not available much, anymore, but Cobalt
> tool steels, like M42 and M57 are very common, cost only cents more
> than the HSS tools, and last many times longer.
>
> The Chinese HSS tools sold at a discount by many of the machine shop
> supply outfits, in the blue tubes with rubber-stamped labels, no brand
> name, are ABSOLUTE CRAP! I won't buy them any more, for sure!
> SOme of them look like they were sharpened by hand by a blind man!
> And, that is an insult to the blind!
>
> But, even brand-name HSS cutters just don't last very long, compared to
> M42 and such cutter materials. Next time you buy cutters, check out the
> prices and get some standard end mills in M42. You'll never go back
> to HSS. With even good HSS cutters, I can easily see (sometimes without
> any magnifier!) edge wear after just minutes of cutting aluminum sheet
> panels, probably 6061-T6 or similar alloy. With the M42, I can run them
> all day before the wear is apparent with a magnifier. With solid carbide,
> the finish on the cutter just begins to shine after a day of work. But,
carbide
> is not forgiving of mistakes, hitting the fixture or vise, being dropped,
etc.
> Solid carbide is so cheap, now, that I am starting to use it quite a bit
in
> the smaller sizes. Tool flex in the 1/8" sizes is a big problem. Try
cutting a slot
> with a 1/8" HSS cutter at full width, then try it with a solid carbide
cutter.
> The HSS slot will wander all over the place due to tool flex, the carbide
will
> be very straight.
>
> Jon
>
>
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