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Cutting openings in sheet metal ducts. BETA-32 10-21-2007
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Posted by PaPaPeng on October 23, 2007, 8:46 pm
On Sun, 21 Oct 2007 20:01:18 -0500, "Steve Barker LT"

>My HVAC man uses tin snips. Novel concept eh? Take a screwdriver and
>hammer, make a hole, snip away.


Visited the HVAC parts supplies shop recently. Saw a strange 12 inch
screwdriver like tool that has a sharpened V shaped notch just behind
the 1/2 inch blade. So I asked what for and how does one use this
tool?

The tool is used to cut openings, straight lined or curved, in HVAC
sheet metal ducts. Use the front of the blade to punch a slot hole
into the metal. Hook the notch over the sheet metal. Hammer on the
flat of the screwdrivers's shaft just behind the notched part. The
notch will cut cleanly along the path of the blows.

Ingeneous!



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Posted by Mikepier on October 21, 2007, 9:49 pm
> I need to cut 2 rectangular openings in an existing HVAC supply and return
> ducts.
>
> How can I do this?
>
> I've tried using a power jigsaw with a metal cutting blade -- big mess.
>
> I see things like power shears when I do Google searches, but that seems
> like a whole lot of money to spend to just cut the 2 openings.
>
> Are there any hand tools or cutting chisels that will work for this?
>
> Any other suggestions?

Here's a DIY video on how it's done. Although this is for a circular
collar, its similiar for a rectangle.
http://www.youtube.com/watch?v=gSN6L2KgDNA


Posted by BETA-32 on October 21, 2007, 10:13 pm
Thanks for the youtube.com video link.

I guess tin snips it is, since that's the unanimous view. I didn't even try
them because I thought that would never work, but obviously I was mistaken.

Thanks everyone.

>> I need to cut 2 rectangular openings in an existing HVAC supply and
>> return
>> ducts.
>>
>> How can I do this?
>>
>> I've tried using a power jigsaw with a metal cutting blade -- big mess.
>>
>> I see things like power shears when I do Google searches, but that seems
>> like a whole lot of money to spend to just cut the 2 openings.
>>
>> Are there any hand tools or cutting chisels that will work for this?
>>
>> Any other suggestions?
>
> Here's a DIY video on how it's done. Although this is for a circular
> collar, its similiar for a rectangle.
> http://www.youtube.com/watch?v=gSN6L2KgDNA
>



Posted by JoeSpareBedroom on October 21, 2007, 10:15 pm
> Thanks for the youtube.com video link.
>
> I guess tin snips it is, since that's the unanimous view. I didn't even
> try them because I thought that would never work, but obviously I was
> mistaken.


What? Why do you think they existed? For cutting pizza?



Posted by BETA-32 on October 22, 2007, 10:19 am
>> Thanks for the youtube.com video link.
>>
>> I guess tin snips it is, since that's the unanimous view. I didn't even
>> try them because I thought that would never work, but obviously I was
>> mistaken.
>
>
> What? Why do you think they existed? For cutting pizza?

For some reason, I was thinking that there would be no easy way to get tin
snips into the metal and cut along the line without mangling the metal.
Then I watched the video and -- DUH -- I realized that I could just make the
first entry cut in the middle of the area to be removed, and then approach
the actual cut line from an angle and do the cutting from there. I am not
usually this dense.



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