Originally Posted by
thehomeengineer
This is OK as long as the bore/hole is deep enough or a through hole to allow the adjustable parallel to be located in place to take the reading. I like the use of the plug gauges as this can have an upper and lower tolerance turned/machined on any old piece of bar big enough to suit the application.
I do have some Moore & Wright bore parallels, which have a crown on the top of them, to measure across, but find the same issue with them. Great when they fit but very limited in their use.
For me, first choice (if you have one) internal bore mic as the bore can be checked in several positions and along its length so any taper that can occur can also be identified.
The Home Engineer