Board bows work well with machine work & tapper when I first started I got the recipe for a pyramid bow off the net and set my thickness planer for 9/16 ran it threw profiled it made and shaped a handle and had a bow in a day, then I bought the bent stick & followed his recipe for limb tapper and it was tillered almost perfect after machining , but with staves following whoopitidoo s,undulutions,snakes etc , machining with out human control is tuff Im looking forward to trying the power file I will give it a shot on a test peace over the week end ! Im glad to see all the positive comments last time this subject come up there was a big hoopla about primitive vs not.