The best way to make perfect clean holes is to use a punch.
How to cut a perfect circle in sheet metal.
In response to a question about h.
It didn t work as well as plan.
That link shows an adjustable circle hole cutter but does not appear to be used on metal.
You can buy a 5 holesaw that will cut a perfect circle but will leave burrs that need to be removed.
When there is will there is a way somewhere between brute force and finesse i used a terratek multipurpose oscillating tool to cut out a 12 inch diameter h.
One of the fastest most precise sheet metal cutting methods is to cut with high power laser.
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The speed and orientation of cutting with laser tools are limited within 2d.