There are two kinds of bearing, soft and hard, in dynamic balancing machine. Soft bearing balancing machine has soft swing frame comparing with the hard one. In the process of start and stop transmission shaft, swing frame of soft bearing has various vibration while such phenomenon not exists in hard bearing.

Theoretically speaking, soft bearing balancing machine can achieve higher measuring precision. However, it only can be recognized by extreme extractive testing. For dynamic balancing machine with transmission shaft, the precision of hard bearing has exceeded actual requirement head and shoulders above. If it is found that the precision of one balancing machine with transmission shaft can not meet the needs, it must be other factors. Since there are many factors that can affect balancing precision, soft and hard bearing are only a tiny factor.