Patent ID: 7878098

Claim:
A method for cutting a roll of sheet material, comprising: a) providing a chain saw having an elongated blade, said elongated blade comprising generally parallel elongated sides and a blade length, an end attached to a driving mechanism, a free distal end opposite the attached end having a blade width less than the blade length, and a chain crossing the free distal end length; b) advancing the free distal end of the elongated blade into the roll of sheet material to plunge cut the roll of sheet material by the chain crossing the free distal end from an outer circumference to a central axis along a linear insertion path that is substantially co-linear with a longitudinal axis of said elongated blade and cutting the roll of sheet material with the portion of the chain that crosses the free distal end of the elongated blade as that portion of the chain crosses the blade width of the free distal end of the elongated blade; c) holding the roll of material proximate to the elongated blade at only one end; and d) adjusting the position of a cutting guide and the elongated blade relative to the roll of material using at least one positioning guide.