Woodguy I give up. I have a planer and the blades are on top as well, a planer does not take the twist out for a board and I do not want to argue at all so lets just agree to disagree.
Windmill man that is a jointer(in the USA) or planer/ jointer and the blades are on the bottom and will take the twist out, I agree on that.
I thought Woodguy said the blades were on top in his post, so am I confused. He said "Over the top is regarded as the planer which is used to straighten & square the timber", so as written I disagree with that.. But seeing the picture of what Windmill man posted I agree on that machine will take the twist out for sure.
I apologize if I am sounding harsh, sometimes I come across that way, no disrespect intended at all.