Abstract: A table structure of the machine includes a table top defining an open area through which the trunk of a small tree may extend to enable lateral abutment of the lower trunk against an edge of the table top. A second or elevated abutment is carried on a post for engagement with an upper end segment of the tree trunk to position the trunk in an upright manner for subsequent cutting off of the trunk base. A circular power saw is swingably mounted on the table structure and swings about an axis during a trunk cutting operation. A saw carrier is spring biased so as to disengage the saw from the trunk being cut. A blade guard of the saw is automatically retracted by a tether to expose the saw blade during a cutting operation and oppositely to conceal the blade when retracted away from the tree trunk.