I do electronics so I use a pin vise to spin the bit and usually a carbide 20 mil or so diameter bit, I don't get many crush injuries but have had staph or the like under a fingernail a few times; Same sense of relief but it's not blood coming out. Raising an injured finger above heart level can reduce the dreaded "Oww I heel my heartbeat in that finger, in a BAD way!" symptom. And with a pin vise you're drilling pretty slow so chance of overpenetration is reduced.