[meteorite-list] CBN blades

[Michel Franco]

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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