Don't use a grinding wheel on aluminum, it will just clog up the pores. Any of the green wheels should be silicon carbide and are used for non ferrous materials (but don't use them on anything but carbide). For small mounted stones there's only what you have available, it's not like surface grinder/cutter grinder wheels. I don't like to use a die grinder if I have to remove more material than .015 or so, I'll use a rotary burr instead to rough out the geometry. If you're wearing out wheels then you should choose another method of roughing out the shape/hole. If you do go with carbide burrs then you'll need to use a very steady hand to avoid chatter. Carbide does cut quite well and last long ONLY if you can avoid chatter/vibration as carbide does tend to chip/shatter under shock/chatter/excess vibration. |