Although the Dremel Ultra-Saw US20V is compact and cordless, it's extremely powerful and quite versatile for its size (it rotates 90 degrees for use as a sanding tool or angle grinder, too).

I can sharpen the blades to last 100 hours of cutting on average but I know the angle isn't right. I'd prefer not to make a jig. I know Dremel makes a jig kit but I want to use the die grinder.