Lumbermaker

The lumbermaker is a device that you clamp onto the bar of the chainsaw and that can glide over a guide bar, as shown in the picture. It can be used to cut out doors and windows in a logwall, but you can also use it to make hustimmer by sawing two sides from a log.
Unfortunately the saw we're using proved to be too weak to cut through long sections. The short cut above of about 15cm took more than 15min. The saw is a stihl 230 which has a 45cc, 2kw engine .