Quote:
Originally Posted by Slowkrawl
I'm a welder and I have never heard that before in my life. I've used a disk covered in alum. to grind steel lots of time, no blown up disks. Unless you have personally seen it happen, I think whoever told you that is full of shit lol
On that note though...wierder things have happened, pure oxygen and oil has been known to explode.
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JT is right on this one, alum just loads up the wheel media and you are then effectively using an alum 'coating' to "grind".. not brilliant. Heat is normally carried away from the bonding material/grinding media by the material being removed. A loaded wheel will in fact overheat the bond and bad things happen. This is more an issue for thinner and smaller wheels. A loaded wheel will clean itself slowly when used to grind materials harder than the embedded aluminum. But it's stupid. You won't get a good edge on anything that way. I exploded a wheel my first time with a surface grinder back in trade school... it made a real mess of the sheetrock in it's path and left a massive gouge in the mag table. All I did was misjudge my cut depth.
I recommend either a good silicon carbide stick or better yet a diamond wheel dresser, they should never be used with any junk on them. If only from a balance standpoint.
Also if you think I am full of shit I've been a fabricator/machinist/mechanic for ~20 years. Not greasing the O2 regulator is about the second thing you learn in welding training, right after learning how to use a striker...
No offense krawl, but them's the facts.