Makita UC022G Instruction Manual

Also see for UC021G: Instruction manual Instruction manual Instruction manual Instruction manual

20 ENGLISHSharpening the saw chainSharpen the saw chain when:• Mealy sawdust is produced when damp wood is cut;• The chain penetrates the wood with difficulty, evenwhen heavy pressure is applied;• The cutting edge is obviously damaged;• The saw pulls to the left or right in the wood.(caused by uneven sharpening of the saw chain ordamage to one side only)Sharpen the saw chain frequently but a little each time.Two or three strokes with a file are usually sufficient forroutine resharpening. When the saw chain has beenresharpened several times, have it sharpened in ourauthorized service center.Sharpening criteria:WARNING: An excessive distance betweenthe cutting edge and depth gauge increases therisk of kickback.221 13 1Fig.37► 1. Cutter length 2. Distance between cutting edgeand depth gauge 3. Minimum cutter length (3 mm)— All cutter length must be equal. Different cutterlengths prevent the saw chain from runningsmoothly and may cause the saw chain to break.— Do not sharpen the chain when the cutter lengthhas reached 3 mm or shorter. The chain must bereplaced with new one.— The chip thickness is determined by the distancebetween the depth gauge (round nose) and thecutting edge.— The best cutting results are obtained with followingdistance between cutting edge and depth gauge.• Chain blade 80TXL : 0.65 mm303055 55Fig.38— The sharpening angle of 30° must be the same onall cutters. Different cutter angles cause the chainto run roughly and unevenly, accelerate wear, andlead to chain breaks.— Use a suitable round file so that the proper sharp-ening angle is kept against the teeth.• Chain blade 80TXL : 55°File and file guiding— Use a special round file (optional accessory) forsaw chains to sharpen the chain. Normal roundfiles are not suitable.— Diameter of the round file for each saw chain is asfollows:• Chain blade 80TXL : 4.0 mm— The file should only engage the cutter on the for-ward stroke. Lift the file off the cutter on the returnstroke.— Sharpen the shortest cutter first. Then the lengthof this shortest cutter becomes the standard for allother cutters on the saw chain.— Guide the file as shown in the figure.12Fig.39► 1. File 2. Saw chain— The file can be guided more easily if a file holder(optional accessory) is employed. The file holderhas markings for the correct sharpening angle of30° (align the markings parallel to the saw chain)and limits the depth of penetration (to 4/5 of thefile diameter).301/51Fig.40► 1. File holder