[Milwaukee Power Tool Deal Thread]

http://www.garagejournal.com/forum/showthread.php?t=186145

fwiw

[using a impact driver as a hammer drill?]

Everything depends on what you're drilling.  A carbide bit will go through most masonry without hammering but not well. Then again you can run a spade bit through some brick without hammering.  Using an impact driver does have some advantage over a drill but thats only if you press hard enough to cause impacting which is almost impossible with a tapcon bit.

[Are masonry disks OK to grind metal?]

The big difference is silicon carbide for masonry rather than aluminum oxide normally used for metal. You can use either wheel on either thing but the proper one will cut faster and last longer.  In my experience silicon carbide masonry wheels also work better if you need to grind gummy materials like aluminum because less sticks to them and they tend to give a smoother finish than aluminum oxide grinding wheels. Your experience may vary though.  Of course if you got a diamond wheel, which I doubt you'd mistake for a metal wheel, it will dull quickly and not grind well on metal.

 

tl;dr: grind away

[Milwaukee One Key?]

Someone goofed