[meteorite-list] CBN blades

[Midwest Meteorman]

Thanks for sharing this with us.

Tim Heitz





----- Original Message ----- 
From: "Michel Franco" <michel at caillou-noir.com>
To: "almitt" <almitt at kconline.com>; "Andreas Gren" <info at meteoritenhaus.de>
Cc: <meteorite-list at meteoritecentral.com>
Sent: Monday, January 03, 2005 4:18 AM
Subject: Re: [meteorite-list] CBN blades


> 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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>
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