Following your work with haw .......
Very nice work.
Can you tell me what gauge (or mm) sheet metal you were using....cold rolled.... how many passes with progressive pressure did you need to be doing to finish a rib. I assume that you do one rib to its full depth before starting the next one.
It seems that every attempts I have made, on scrap pieces, results in a corrugated sewer pipe .... really curving back on itself. Is the secret to roll and stop short at each end to have a flat end surface.
Cheers
Bob C
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Bob Carriere....B.T.B
C15a Cab 11
Hammond, Ontario
Canada
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