When I'm at the cutting table, my back is to the door. I usually can hear DH when he close to my door. I told him about all these accidents and told him when he's on the way to make noise so I'm not alarmed.
More advice...luckily when my sewing machine "bit me" ds was home and he gave me the cell phone so I could call 911 for help. Now I have a phone in it's cradle all the time in case I need help, If your dh is a woodworker make sure he has a phone in his tool belt or pocket. Best to be prepared.