[meteorite-list] CBN blades

From: Michel Franco <michel_at_meteoritecentral.com>
Date: Mon Jan 3 05:18:53 2005
Message-ID: <07ba01c4f17d$9e90c3f0$0201a8c0_at_cailloubi12zzr>

Hello list;

I have some experience in cutting as I had an order of 4000 stamp size
slices for new year's Eve cards ! I was cutting Sahara 02500 L3.

Before this mass cutting I had used CBN or diamond blades since 1998 in
cutting meteorites. I have 3 blade saws from 4 " to 15 " diameter. The
smaller with adjustable speed. The 2 bigger with high speed. Several home
made sample holders.

TRo cut these stamp slices I cut thick slices 12 to 15 mm thick with a 1.8
mm 405 mm dia diamond balde. Then I prepared bars from the slices, either
with 0.4 or 0.6 mm thin CBN or with 1 mm thin Diamond blade. then I sliced
up the stamp size using both techniques.

 Definitly CBN blades do not last long. I started cutting with CBN, ran out
of blades, ordered new blades, ran out again, and finally finished the job
with an old diamond blade 1 mm thin.

I have made all experiences possible with cutting oils, speed etc.

Diamond blades last more than 50 times more.They are a bit thicker but their
longlife compensate by far the slightly higher cut loss.Another aspect is
the cutting time. Diamond blades cut much faster. I was able to cut 500
stamp size pieces a 8 hour work day using 3 CBN blades, and I cut 1500 stamp
size slices with my usual Diamond blade, still in good cutting shape in the
same time.

My conclusion is CBN blades cut when new, but do not last long at all. They
are quite expensive and I will not recommand these CBN blades even for stony
meteorites.

You can use them for very expensive material, useless for mass production,
or if you cut a lot of material. Your cutting time becoming a factor you
must take in consideration.

CBN do not like high shock level, at all.

My 2 cents

Michel



----- Original Message -----
From: "almitt" <almitt_at_kconline.com>
To: "Andreas Gren" <info_at_meteoritenhaus.de>
Cc: <meteorite-list_at_meteoritecentral.com>
Sent: Tuesday, December 28, 2004 7:41 PM
Subject: Re: [meteorite-list] CBN blades


> Hi Andreas,
>
> Hard to say what the problem is without some other imput. First it depends
> what
> you were cutting. If you were cutting urelite then if you got one cut out
> of it
> you were lucky. If you are cutting stony then something is wrong. If you
> are
> cutting iron then maybe you have run into carbos (small little diamonds)
> or a
> lot of schreibersite plates. The problem could be with the blades
> themselves not
> well made (usually the adhesive that binds the cutting material on the
> blade can
> be bad, or the way it was fused on the blade.
>
> The cutting material on the blade could also be bad and not as hard as it
> should. Sometimes it has to do with the cutting fluid and the angles it
> goes on
> at. Sometimes items cut really well and other times when the fluid isn't
> adjusted right then it can cause cutting problems. I myself have been
> experiencing cutting problems with these blades (and why I have responded)
> and
> it leads me to believe that there is a problem in their manufacturing
> somehow.
> They are useful but if they don't last then they are useless. All my best
> to you
> and everyone else who finds this useful.
>
> --AL Mitterling
>
> Andreas Gren wrote:
>
>> Hello List
>> I have some question about CBN blades.
>> Now I used a 8'blade 0,12'thick for reducing the cut lost and after two
>> small cuts al the CBN is lost in bits and now I have a bright metal
>> blade. I
>> bought the blades from different dealers. I always use oil for cooling.
>>
>
>> Now the questions:
>> Did anyone had the same problem? Are there different producers of CBN
>> blades?
>> Is it a quality problem? Have I done something wrong?
>> I think the blades are a little bit to expensive to throw them away after
>> one use.
>>
>> Thanks
>> Andi
>
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Received on Mon 03 Jan 2005 05:18:50 AM PST