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The domino machine cuts a mortice for a tenon. It's a great tool. I had the depth set for a few mm more than the mdf I was cutting into and put my hand on the opposite side of the cut. It sounds like 'who would be that stupid' but I was tired and lost concentration. It actually shaved a little off the tip of the bone but the surgeon was brilliant. He told me he saw my case coming in and rushed down to A&E because he was so excited to get a proper job to do.
Flush trimming is definitely the fun end of routing. I have a little Festool one for trimming veneers which is easy work. Any kind of guided routing where the router is well supported can be quite relaxing.
I like to watch some good old fashioned safety videos every so often to get a visual image of how fast things can go wrong. I did rout the end of my finger with a Festool domino and was lucky to be within 5 minutes walk to Chelsea Westminster hospital where a plastic surgeon specialising in hand surgery was training, he came to A&E and made sure I could still play the guitar.