On 10/10/2010 8:52 PM, Colbyt wrote:
I own most of the tools and would hate to buy a new one for this project but
take your best shot at the best way and tool to do this and I will go from
there.

I have not actually measured it but I think the main trunk line I need to
cut is 12x18, might be 12x24. Standard gauge metal HVAC duct from 40+ years
ago.

I cut all kinds of metal with an angle grinder, something like:

http://www.lowes.com/pd_36866-79992-...ductId=1208961

Mine is an old B&D made in the US. Only B&D product I still like. I
see cheapies everywhere. The sparks fly, just like on Letterman.

Get a thin disc, remember they don't turn, or you won't have a disk.

I suppose tin snips would work *after* you got a start. Perhaps you
could start on a corner with a jig saw, you could cut it all with that too.

Just my non-professional opinion. I don't do duct work. I may be
rambling...

Jeff


I have reasonable access on all four sides. Well that one side is
going to be a b**** but I can do it once if I must. Most likely, I want to
return the duct to its original position after the project is completed.. I
might choose to step it up to make it easier on the next fat guy. But that
part I can figure out.

I can't unzip it at the seams without a lot of digging in 60+ year dried
dirt as the next seam is resting on the ground. Hey, I did not do the
original install. If I had it would be far different.

So what I want is a clean way to cut the duct without destroying the metal
on either side of the cut. As an example: much like cutting the four sides
of a wood box with a table saw.

Now to inject a little humor to the thread; the reason I want to do this is
because my belly has grown to big and my back to bad to scoot under the
tunnel I made years ago in this crawl space. Did I mention I hate tight
crawl spaces.

Suggest a diet and die. There isn't time or the willpower to make it
happen. I got to get over there to figure out where the water leak is coming
from. Go ahead and make your fat guy jokes if you must. Paybacks can be
awesome. -