Somewhere or other I saw a video of a portable mill that used a circular blade of around 18 inches or so in diameter. Its advantage was that could do a virtical cut on the out run, and a horizontal cut on the return run. My problem is that I can't find it! Can you help please.

Here is one version.

Mighty Mite Portable Sawmills

Anyone ever used one of these?
chainsaw mill

My neighbour at the cottage has one. He burnt out his first chainsaw... but bought a quality saw and is turning out some nice lumber.

Thanks to hkstroud and rtw for your comments