Plank making bots are macros that run between East Varrock Bank and the nearby sawmill making oak planks and sometimes, higher or lower plank types. The bots pickpocket the level 21 gaurds on the way to the sawmill to get money for making planks. If you believe someone is a plank making bot, and have evidence to prove it, report them for macroing (under Honour). They are one of the more common bots post-December 10 2007 Updates, but are still rare.