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Cutting sheet

 
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lennyk
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Joined: 17 Sep 2009
Posts: 97

PostPosted: Tue Nov 30 10 3:57 am    Post subject: Cutting sheet Reply with quote

Hi Guys,

What's the best/easiest way to cut sheet metal, like 20ga etc
with it getting twisted like if I used a shears ?
I have used a jigsaw in the past but find it tedious.

L
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ckone
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Joined: 23 Oct 2009
Posts: 2451
Location: Austin, TX

PostPosted: Tue Nov 30 10 4:52 am    Post subject: Reply with quote

You can get a metal cutting blade for a circular saw. I used one to cut on a 1/4" thick tank, worked great. It did not however work so well on some thicker steel i was working on.
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Rocko-la
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Joined: 28 Jan 2010
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PostPosted: Tue Nov 30 10 4:53 am    Post subject: Reply with quote

You can also use an angle grinder.
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ggarner
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Joined: 22 Mar 2010
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Location: San Diego, CA

PostPosted: Tue Nov 30 10 5:14 am    Post subject: Reply with quote

Depending on how much you have to cut you have many different options.

You can have it sheared at a machine shop to the sizes you want. This is a good choice if you need large pieces and want them to be perfectly straight. My local place charges $80/hr to shear stuff. Last time I had them shear 30' of 12ga steel into about 15 or 16 different sized pieces and it cost me $60.

If you need to only cut a very small amount you can do it with and angle grinder and cut off wheels, but its difficult to get perfectly straight cuts.

You can plasma or OA cut it with a steady hand or a guide.

You can cut it with cutting shears/nibblers.
There is this style of shears that will cut up to 18ga for ~200 bucks
http://www.northerntool.com/shop/tools/product_988785_988785

There is also this nibbler style of shear that will do thicker material as well and does good work if you have to cut curves etc $360
http://www.northerntool.com/shop/tools/product_200194924_200194924

There is also a drill attachment that may work. I have never used one of these but if you only need to cut small amounts, this may be worth trying out. The big plus here is it is only $50
http://www.northerntool.com/shop/tools/product_200202124_200202124

Not sure how well this would work on really thin material but I know people who have cut thicker stuff with a circular saw fitted with a carbide blade. But you have to be really careful about the saw kicking back. I think the carbide blades go for about $20 a pop.

http://www.youtube.com/watch?v=92KA-LgNBUM
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Wreckless
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Joined: 15 May 2009
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Location: New Braunfels, TX

PostPosted: Tue Nov 30 10 11:08 am    Post subject: Reply with quote

4.5" angle grinder and cutoff wheel. Draw your line and let the wheel pull itself across the line for a nice straight score. Run back over with multiple passes and you can get an almost shear cut. Score it halfway thru and break it the rest of the way works well too.
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Jonnyrod
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Joined: 11 Feb 2010
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PostPosted: Tue Nov 30 10 7:16 pm    Post subject: Reply with quote

I like to keep the heat away from thin stuff it warps too much. I would go with a 4 & 1/2" angle grinder with Motabo wheels. Smile
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alldaymckay



Joined: 05 Oct 2010
Posts: 24

PostPosted: Wed Dec 01 10 9:39 am    Post subject: Reply with quote

we use a good 15 amp circular saw with a metal cutting blade for anything under 1/4 that too big for our Ironworker. use a straight edge for a straight cut. a good carbide blade is expensive but can be sharpened, you can also get abrasive blades like a cutoff wheel that fit a skill saw but they wear down fast.
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Smokenstein
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Joined: 07 Jul 2010
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PostPosted: Fri Dec 03 10 6:20 am    Post subject: Reply with quote

Wreckless wrote:
4.5" angle grinder and cutoff wheel. Draw your line and let the wheel pull itself across the line for a nice straight score. Run back over with multiple passes and you can get an almost shear cut. Score it halfway thru and break it the rest of the way works well too.


Ditto
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