I guess it depends on how clean you want the cuts/channels.
I often build shelves out of 2x4s, and I notch the uprights to hold the
crosspieces. All I do is set my circular saw to 2x4 depth, cut either end of
the
notch and whack with a hammer. The bottom won't be perfect, but it will be
close, since it's breaking in parallel with the grain.
In my case, the shelf weight is supported on one of the cut edges, which is
straight. For purlins, that's not going to be (entirely) true.
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