Olle:
That's quite an ingenious bending jig that you have built--very impressive. My thought on why the back of the loop is rounded, although barely noticeable, is that the very small rod clamping screws might be stretching during the bending process, allowing the clamp cap to raise up, allowing the rounding effect. There has to be some tremendous forces exerted on those screws as the rod resists the sharp bending.
Of course, the entire jig system would have to be larger to allow for larger and/or more screws. This is just one more nuts observation.
By the way, I've done a lot of drill rod bending, but I am using W1 rod. It's my understanding that it comes annealed--at least it machines well.
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Neil  The hurrier I go the behinder I get. Sometimes it takes me all day to get nothing done.
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