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Posted by HotRod on December 18, 2006, 11:18 am
I own a compressor, air nibbler, shears and cut off wheels. Everything
except a brake, though a friend does own one. All of the other mentioned
forms of cutting "shrink" or "expand" the metal leaving a very lightly
rolling edge or small marks. The table saw is the nicest cut I've made
though you need to make sure you don't scratch the aluminium.
>
> Bob wrote:
>> I have some sheet metal that I need to cut for a project. It needs to be
>> a
>> cleaner cut and more accurate than can be achieved with tin snips.
>>
>> I considered buying a 7 1/4 inch cutting wheel (if they make them in that
>> size) and using it in my Skill saw.
>>
>> My brother said he had heard that taking a regular saw blade and turning
>> it
>> over so it rotates in the wrong direction, works well for metal cutting.
>>
>> Anyone ever used this method or have any suggestions - pro or con?
>
> This suggestion comes up pretty regularly w/ answers on both sides,
> generally. I've never tried abusing a blade in such a way, but can't
> imagine you could possibly get as clean a cut as w/ a good set of
> snips.
>
> Alternatives --
>
> Best possible cut, accuracy dependent on the operator you find is to
> take it to a tin shop and have them shear it.
>
> Depending on the gage of material, you should be able to get as
> accurately dimensioned cut as needed w/ snips if the snips are of good
> quality capable of cutting the material. You can always clean up the
> edge w/ a good file if you leave it a tiny bit proud.
>
> For thicker material, an abrasive blade is certainly an alternative,
> but it may color and/or distort the material from the temperature.
>
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