Scanspeak - Dynaudio - Helix - Bose
I will suggest that you can actually cut the circle by hand fairly well with something more powerful than a dremel. Like an angle grinder.
You have the pen mark there. That's good enough. A scribe would be even better if you can manage scribing it. But the pen should work.
Use an angle grinder and cut as close to the line as you dare. Then clean it up with a well chalked file. I could probably take down a 1/16" average gap around a 12" diameter circle dead nuts to the pen line in about 3 hours with a good bastard file.
The blue tape is a great idea.
I'd just suggest tape on the backside too, it'll stick to itself through the holes.
You don't want any of your tape sliding on you - moving your line.
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So here is my thought on that. I don't have anything that will draw a legible line on this damn sheet of steel. Paint pen and marker wipe off too easy. I tried inscribing a line but that didn't work for sh!t either.
Here is my thought. I'll use my Dremel to grind a fine line into the steel following the line I drew in the tape. From their I can either take the jig saw or metal cut off wheel to finish the job and have a good guide.
Actually mikeyt had a great idea earlier in this thread I might try. Strap the Dremel and metal cut off wheel to a board and cut through it circle jig style.
Ge0
Scanspeak - Dynaudio - Helix - Bose
I know I'm overthinking this. But I have nothing better to do as my work day comes to an end on a Friday afternoon. I just hope the rain holds off so I can try a few things.
Ge0
Scanspeak - Dynaudio - Helix - Bose
One thing's for sure, if you can't get it done to your liking necessarily, the sheet metal shop may be an option. Hell, they may even have a dye that could punch you out a circle like it's nothing.
Scanspeak - Dynaudio - Helix - Bose
Scanspeak - Dynaudio - Helix - Bose