Part hole machining done using dovetail cutter in first setup. the bore surface is in negative position so while completed the machining under the machine it was measuring dia 52.25/52.30. This dimension measured in Varner Caliper.Hole is in negative wall and cheking is verying by checking in varnier caliper. but after completing the second setup, hole dimension can check in variner. 
After completing tthe second setup hole diameter measures plus side. 