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The #1 rule is always to find as light tools as possible to reduce the risk of work related disorders linked to the usage of power tools.
Weight is one of several factors that makes up the overall ergonomics of a power tool. There are only a few occasions when a heavier tool has a positive effect on the ergonomics of the user: grinding and chipping on horizontal surfaces are two examples of that.
Material removal tools require a certain amount of feed force to remove the material.