He definitely believes some sort of power equipment was sometimes used. He has done scale graphics of stone carvings such as the large Ramses statues and demonstrated that dividing the faces in half and folding the graphic over on itself the two sides matched perfectly such as we would do today but with computer controlled machinery.
Flinders Petrie recorded a stone he claimed had to have been 'grooved' with a saw of some kind
but as far as I know no followup was ever done.
Puma Punku in Peru has grooved stones, some with equally spaced holes drilled right through from inside the grooves. Best to forget all that.
http://en.wikipedia.org/wiki/Pumapunku