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A reciprocating saw is not going to cut straight at all, and is far more dangerous than a proper chop saw for metal.
We run a metal chop saw with a blade meant for aluminum and kids have made at least 1000 cuts this year quickly and safely.
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Very similar saws can act quite differently. Know the difference!
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Hmm, it sure seems to have worked out well for the OP...
I reiterate- just because a tool will do the job doesn't make it the right tool!
A chop saw is NOT the right tool. Chop saws designed for structural tube are called cold saws and typically cost $1000+, have an automatic feed, and run at low RPM to prevent accidents such as the OP's photo. The capabilities of a consumer grade chop saw and aluminum end at things like window screen frames. THIS is a chop saw for structural tube ie: cold saw:
I contest anyone that states a reciprocating saw is more dangerous than a chop saw. How many people do you know have lost fingers to chop saws vs reciprocating saws??
A reciprocating saw will be challenged to make a perfectly straight cut but what are you doing that requires a perfect cut? Welding? Fill it. Anything that requires more precision than a saw cut should be rough cut and then machined.
Acceptable saws to cut structural aluminum:
-Reciprocating saw with bimetal blade
-Bandsaw (vertical) with appropriate blade and blade speed for metal
-Bandsaw (horizontal)
-Cold saw
-Hacksaw