This paper deals with the vibration behaviour of chain-saws and bush-cutters generated by two-cycle engines. The measurement instruments were three accelerometers, three amplifiers and an electromagnetic oscillograph. Vibration was measured at the handle of the chain-saw and the bush-cutter.
Conclusions are summarized as follows :
1) Vibratory-acceleration level generated by bush-cutter is about half as much as that generated by chain-saw.
2) Vibratory-acceleration level generated by a chain-saw with vibration isolator was reduced to about 25 percent level.
3) Vibratory-acceleration level generated by sawing is approximately equal to that generated by no-load running, and displacement amplitude of chain-saw was evaluated at about 0.05-0.2 mm.