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Post by johnjsgems on Mar 15, 2013 14:31:02 GMT -5
The new BD label has no arrow. There should be a sometimes hard to spot arrow stamped in the core. I have to take them out in the sunshine to find it sometimes. I've only found one so far I could not find the arrow on. If label is on correct side, the label in picture would be on the right side of blade facing the saw. Most of the 301 blades are stamped deeper than 303 blades.
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Post by rockpickerforever on Mar 15, 2013 18:06:57 GMT -5
Denny, the last two photos - are they of the cookie monster blade, or a different one? When I said to look at it from the edge, I guess what I should have said was look at it tangent to the edge, if that makes sense? I know what John is trying to say, the outer edges of the blade should be squared, not contoured, or rounded. The cookie monster blade with the bite out of it that you first posted does look rounded. Jean
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sheltie
freely admits to licking rocks
Member since January 2012
Posts: 982
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Post by sheltie on Mar 15, 2013 18:22:10 GMT -5
Jean,
This is my current blade. I didn't notice any roundness in the cookie monster blade, but then I wasn't looking for that in particular. All I can remember about that blade is that it appeared to be "normal" in every respect other than the "bite" out of it. I would guess that had I taken the same pictures of that blade, they would be nearly identical to this one with the exception of the edge perhaps showing more use, understandable after cutting nearly 1,000 slabs in five months I would think.
Denny
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Post by rockpickerforever on Mar 15, 2013 21:08:27 GMT -5
Okay, Denny, here's a graphic representation of what I was trying to say: This blade is on my trim saw (7 or 8 inch x .060 at least, Rock Rascal model J, I think ). Don't recall the manufacturer, but it is a "sintered, continuous" blade. Sorry for the out-of-focus pic, but I think you get the idea . I didn't take a photo of the blade before I put it on, but it was new, and take my word for it, the "edges" or "corners" of the blade were at 90 degrees. (I think it was a huge mistake to run it using water with water-soluble oil. Will change it over to mineral oil before I use it again!) I did not use it a whole lot, but it is quite obviously rounded. So, take a look at your cookie monster blade, and see if you think the edge is rounded. With wear like that, you might/could understand how the slot (kerf?) narrowed and could have contributed to the failure, due to binding. A void in a stone, and then it grabs, and then it bites. Just a thought... I'm not saying that there wasn't some kind of defect that may have caused the failure, just pointing out that in the first pictures you posted of it, it appeared that there was some wear on the blade, possibly from feeding too quickly. I know that is what contributed to the wear of the blade pictured. Jean
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sheltie
freely admits to licking rocks
Member since January 2012
Posts: 982
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Post by sheltie on Mar 16, 2013 8:39:53 GMT -5
Jean,
Thanks for the picture of the blade. As it turns out I did understand what you meant but the picture reinforced it. Of course the difference between the width of a trim saw and a slab saw are very significant and I don't know which would wear more quickly. I would guess it depends on the amount of use.
My cookie monster blade is gone but as I recall, it looked very much like the picture above of looking directly at my current blade. I don't remember there being any obvious wear on it at all. I remember when I bought the saw that one of the questions I asked was how long the blad should last. I was told that with proper care it should last for years. Since the person who told me that wasn't associated with BD, I don't think he had an agenda as the blade came with, so to speak.
Denny
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