For finding the center of round bar
Jenny caliper is used to For finding the center of round bar.
Jenny Caliper. Fixed point 'Jenny' or 'Hermaphrodite' calipers are specifically designed to locate the centre of a round or square section of steel, and are also used for marking off a constant distance from an edge. One leg holds an adjustable point and the other leg features a locating lug.
Excessive cutting pressure
While drilling the drill gets overheated this is due to excessive cutting pressure.
Angle of BSW 'V' form thread is 55 degree.
Feeler gauges are used:
– To check the gap between the mating parts
– To check and set the spark plug gaps
– To set the clearance between the fixture (setting block) and the cutter/tool for machining the jobs
– To check and measure the bearing clearance, and for many other purposes where a specified clearance must be maintained.
Vernier height gauge works on the principle similar to Vernier caliper.