"Steve" wrote in message
...
I have about 250 sheets of used (in good
condition) 26 gage roofing material. They are all
16ft long and I will need to cut many to other
lengths while adding a shop extention.

I have tried tin snips and these cause
distortion of the ridges and spreading of the
ridge pattern, hence sheet width. Not much, but
enough that I get a "fan-out" effect in the
width. Also unable to fit tightly to the next
upper sheets.

I also tried cutting with an hand operated
electric sheer as well and got similar results.

Abrasive cut-off leaves a burr on the edges and
I can to a lot using a hand grinder.
Recipricating saw produces similar results.

I'm told the "pros" use a sheer with a die that
matches the corrigations. The best I could
afford would be a treddle opportated squaring
sheer and with our a die, I would get poor
results due to flattening by the sheer blade.

Are there any other methods that I should try.?
Perhaps a saw blade for my skil saw??


This is what the professionals use
http://www.hitachi-powertools.com.au/tools/nibbler.htm