The point angle in a general purpose drill bit is 118 degree.
Drill chucks are fitted on the drilling machine spindle by means of Arbor.
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.