I'm working on a small mechanical project at home and need to determine the outside diameter of a steel shaft. Unfortunately, I don't have a vernier caliper or a micrometer.
Is there a reasonably accurate method to measure the shaft's diameter using common household tools?
I'm not looking for machine-shop precision, but I'd like to get close enough to identify the shaft size and order the correct bearing or coupling.
What method would you recommend, and what level of accuracy can I...