If you have drill bits then you definitely need a bench grinder to sharpen them on, all you need to do is learn how to sharpen drill bits
. I've seen some very highly qualified men in engineering circles who couldn't sharpen a drill to save their lives. I've had to sharpen drills on everything from a 9 inch angle grinder clenched between my knees (not funny when its a 2.5mm drill bit
) to a really good quality pillar grinder with a 9 inch fine wheel, after all the other crap I've used to sharpen drill bits this one was a peach! I have a small 250Watt bench grinder/belt sander combo unit and its good enough for sharpening bits on down to 3mm dia, less than that would need a finer stone.
D.