BACK-PRESSURE PNEUMATIC INTERNAL GAUGE MECHANISM

Measuring plug 1 is inserted into the bore of work 2. Axial channel 3 is connected to the measuring chamber from which compressed air is delivered to the plug and where its pressure is measured. The plug contains bushing 4 whose tip a contacts the bore surface of work 2. Sliding in the bushing is plunger 5 into which ball-head pin b is pressfitted. Pin b contacts the bore surface opposite tip a. P…