what are the most important points to check on powerful shop machines to insure safety?
The question was rather broad, "power tool". My tractor is a power tool as is my truck, etc.
But, to limit the response to a wood working shop, I'll repeat what my son, an emergency room physician, says.
The most frequent serious injuries are with table saws.
The second most frequent serious injuries, in terms of numbers of incidents, are from miter and/or compound miter sliders.
However, in terms of most devasting the CSM is far and away the worst. Those usually involve finger amputations. The table saw accidents are serious gashes but (usually) leave the fingers in place.
He also says that most of those injuries are to guys like me, middle age to retired age. And, they all say the same thing, "I never do it that way, but just this once........".
Are there any tools that are just plain more dangerous than others?