"Peter Jason" wrote in message
...
Need a 9" dia hole in a 20# sheet metal
surround of a boiler.

The hole must be neat and cut in situ.

Is there a gadget constructed like a compass
that when rotated often enough will cut such
a hole?

Rather like the typical rotating glass cutter
used for cutting large holes in plate glass.

Please help, Frank


Careful work taking small bites with a pair of left or right cutting snips
will make a good hole of this size.
Don Young