Harbor freight tools

It is worse that that. Norton is the world leader in diamond film coating.

Dan

I am always willing to learn. I knew one doesn't use Silicon Carbide on steel, but had the wrong reason. Thanks for correcting me. Now I am curious about the use of Silicon Carbide on other high strength materials as Titanium. Not that I really need to know. Aluminum oxide works well on Ti.

Thanks again, Dan

I thot yours was a good example of "if you can't dazzle them with brilliance, baffle them with bullshit".

Whatever.

Out.

gradstdnt snipped-for-privacy@yahoo.com (gradstdnt) wrote

Worse, or better? :^)

Jim

================================================== please reply to: JRR(zero) at yktvmv (dot) vnet (dot) ibm (dot) com ==================================================

My physical chemistry is pretty old. My first chem book was by Linus Pauling. Hell, all of my chemistry is pretty old now. Lot's of it is still valid, but more and more new knowledge seems to be less intuitive, which probably means that our concept of some of the basics is wrong, or maybe its just chaos. And yep, (a) got me in trouble.

So you are a non believer of covalent bonds and their ability to hold the universe together. In any case, dismiss as you may and believe whatever old wives tales may provide you. Just don't let Mrs. get her rings too close to any iron as some believe they will readily dissolve.

I'm not so sure you're alone here, George. Since the theory of quantum mechanics hit the scene, seems many of the rules no longer fit. The recent PBS viewing of the string theory may enlighten all of us eventually, assuming, of course, that we can understand just what they're proposing. To me, makes no sense, but then I have a hard time finding my way home. Not understanding something that even Einstein didn't shouldn't surprise me.

Harold

Okay I looked at the web site you referenced. And found C2H2 acetylene listed as a compound with a triple covalent bond. Which according to you means it is very unlikely to have that bond break. So why am I inclined not to have a container of acetylene compressed to more than 30 psi? Does acetylene not burn?

Dan

Chaos theory and fractals mess me up enough. OTOH, I don't know what I knew yesterday, or was it last week?

"Harold & Susan Vordos" wrote

Harold, I have wondered about that.... I have some fairly large ruby wheels I obtained years ago, and without exception, they are excellent on hardened steels... (by excellent, I mean cool cutting).... much better than the white, and infinitely better than the grey aluminum oxide. I recently found some for my surface grinder, and they also work very well on cast iron and mild steel. Why are they red? Marketing hype? Why do they seem to work better? I have other wheels just as coarse and soft acting, and they don't do any where near as well.

Mark

I don't know how to tell you this, but a Ruby is AL203 == Aluinum Oxide in a trigonal chrystal structure with a hardness of 9. Diamond being a hardness of 10.

Well, you told me, congratulations. That being said, the question is, is the ruby color significant? Since all of the wheels I mentioned are aluminum oxide, why is the ruby wheel better (in my experience) than the others? The question was mostly directed at Harold, who is an acknowledged expert on grinding.

Mark

the best grinder i ever had: did not get red until after she started up.. boy did she get red......