My experiences with tapping aluminum ( and all non ferrous materials ) and I have 25+ years - use WD-40, it's a light runny solution that will follow the tap down the hole - not scrap off at the hole opening and lubricate only the exposed part of the tap like heavy tap oils. For all ferrous...
Don't be alarmed either if once you get a green wheel it seems to be just disappearing in a cloud of dust. This is normal for these types of wheels. Which brings up another point if you plan to sharpen a lot of cutters you might want to pick up a couple of them if they are in your budget. Here...
I posted on a different forum here kinda by mistake. So instead of reposting I am just going to link it here instead. Please check it out, read my description included there and come on back and post your comments. Thanks guys...