The process to trim them is basically to secure the angle to the work bench with the clamps. I absolutely must use two hands with the dremel tool in order maintain control of the tool while it cuts, so it is imperative that the clamps are positively securing the work. If you even suspect that the part is starting to move, turn off the tool and re-clamp the piece before continuing. You line of the cutting wheel so that it si just outside of the trim line for each cut.
I basically started with the cuts that separate each stiffeners 
from the angle stock, and then reclamped each one individually to make the angle cuts on the flange and do the final trimming. Using the Dremel tool makes this process go quite quickly, but it is also very easy to make a mistake. The key, as with all things about this process, is to take your time and follow the same process for cutting each one.
from the angle stock, and then reclamped each one individually to make the angle cuts on the flange and do the final trimming. Using the Dremel tool makes this process go quite quickly, but it is also very easy to make a mistake. The key, as with all things about this process, is to take your time and follow the same process for cutting each one.
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