By Bernard R Kestel
The Chainsaw Operator's handbook is the fundamental defense device for all specialist and leisure clients of chainsaws. The e-book contains easy-to-follow charts, color illustrations and directions to lead chainsaw clients via uncomplicated move slicing, uncomplicated tree felling and challenge tree felling, together with computer assisted tree felling suggestions The sections of the e-book correspond to the nationwide Competency criteria for chainsaw operators, which shape the foundation for accreditation in executive corporations. those criteria are stated in every one part. The 6th variation has been considerably revised in keeping with new defense measures and competency criteria and in addition illustrated with new color line drawings and color pictures.
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Extra resources for Chainsaw Operator's Manual: The Safe Use of Chainsaws
Box scarf • Developed because old cross-cut saws and early chainsaws could not cut satisfactorily at an angle to the grain. • Can be used when felling a tree with diameter more than three times greater than the length of guide bar. Desired direction of fall *90° scarf • Can be used in trees with very pronounced butt swell. • Both cuts relatively easy to match. • Cut to such a depth that the scarf width is 2/3 tree diameter. • Usually the depth of the 90° scarf is less than the depth of a standard scarf.
All hung-up trees must be marked with a suitable sign displaying ‘Danger Hang-Up’. Refer to felling hung-up trees. DANGER Special conditions Include the presence of fences, power lines, filter strips, etc. 54 | Chainsaw Operator’s Manual HANG~UP Level 2 Preparation at each tree prior to felling Clean around base of tree Preparation prior to felling • Prepare a clean work area around tree. • Remove small bushes to enable a good footing and to prevent ‘kick-back’ through guide bar striking hidden obstacle.
Support your body and right knee against the tree to relieve the strain on your back and enable you the guide the saw better. Desired direction of fall A. Align ‘gunning sight’ along the desired direction of fall. On some saws, the front handle can be used to align the felling direction. 60 | Chainsaw Operator’s Manual C. Grip the top edge of the front handle, since this will tilt the saw at the right angle for sawing the upper cut. Humbolt scarf • Frequently used in saw log operation. • Sometimes difficult to cut very low to the ground.
Chainsaw Operator's Manual: The Safe Use of Chainsaws by Bernard R Kestel