die grinder help!

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i bought a air die grinder for 50$ the other day amd went to use it today and i wasnt sure which die did what. so i used the bluey gray one and in about 3 min of use on spider i made it was worn out nearly. i have a white dies and redy-pink ones. so either its the quality or i was using the wrong one
Reply:I use the carbide ones. DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:I think you are talking about grinding stones (not dies), I have never had much luck with mounted stones but then again I have never bought any good ones. In the cheapo stones that come with a lot of die grinders I think the different colors relate to differnt grits. What are you grinding on? I almost always use a carbide bur like David said.-Dan
Reply:Yep, those mounted stones wear right out on steel, and load right up on aluminum.You need to go buy some carbide burrs. Decent ones will run you $25 and up- some can easily cost more than you paid for your grinder.They will actually cut steel, and last a long time, long as you dont drop em and chip em, or let em bounce around while grinding- carbide is very hard, but brittle, and chips and breaks on impact shock, but will grind off steel all day long.The little shavings are sharp and nasty, and I find em in my clothes for days afterwards.Wear a full face shield.
Reply:Yeh, save the stones for the rare occassion. They generally end up being a sacrifice consumable. One stone = one job. There is some grand scheme behind their make up, I never bothered committing it to memory. The pinkish are garnet, the dark grey are aluminum dioxide, light grey is silicon carbide, and so-on like that. Follows the same scheme as sandpaper.  Each one works better or worse on different materials from steel to wood to plastic.
Reply:The ones i use on alum cost me $12 each got them from tricity nut & bolt a place down the road sold the same ones $36 each but have seen some around $90 at some places Attached Images