We have some big old oak trees in the back yard and one of them just dropped a sizable branch, the base of which was about 6" diameter. I figured rather than chop it up and put it in the street for the yard waste people to pick up, I could cut up at least the larger diameter parts for smoking wood. Trouble is, this is really hard wood. I first went at it with a hand pruning saw, and it works, but it's slow and a lot of work. Next, I tried a sawzall with 9" pruning blade. That worked great on the 1-2" diameter branches coming off the main branch, but not real well on the 5-6" thick main branch. I think the blade didn't get enough travel and it would bog down in the saw dust that failed to drop out. A neighbor suggested a circular saw...that didn't work at all.
Ideally, I'd like to cut this thing into discs about 1-2" thick...probably around 100 of them. Is a chain saw the only reasonable way? Will a power pruning saw (basically a 10" bar chainsaw on a stick) be able to handle 6" thick branches? They make such an attachment for my string trimmer/edger/blower...but I don't want to blow the $ on it if it's too little saw for the job. Also, with a chain saw, is bar oil going to get on the wood...and if it does, is that an issue if I'm cooking directly over it? I'm guessing not, since I know the tree service people sell the larger trees they slice up to local grills for cooking.