The barley twist on straight cylinder can be cut in less than 2 minutes...I agreed...but if i want to make the barley twist on irregular shape (tapered and curved cylinder) it will take hours..
It will take hours because i will have to first relief carve the shape by multipassess with smaller tool say 1/8" ball nose tool ..This will take a lot of time...
Then I will use the barley twist tool and Feature Machine The twist in less than 02 minutes... I will use Artcam for that purpose...