Rufus,I have been using the same blade on my Harbor Freight mini chop saw to cut dozens of carbons and aluminum arrow shafts.The secret is to be able to rotate the arrow shaft as you cut.You just bring the blade into the shaft and rotate it around.That gives you a squarer cut and you don't need to just cut straight down through the shaft,which like you have found out after some cutting it won't cut all the way through.I made a jig for mine with an adjustable stop block.On the stop block I drilled a taper hole with a chamfer bit.The taper hole allows me to rotate the shaft as I cut and the taper keeps the nock end centered.This is how the more expensive arrow saws work,they only have a small portion of the blade exposed.you bring the arrow shaft just into the blade and rotate it as you cut.