For conduit and other thin tubing, sheet metal work etc. use a 0.8 mm pitch.
54) The most suitable pitch of the hacksaw blade for cutting thin section tubes is
Related Cutting Tools MCQ - Machinist(Set-1) with Answers
For soft materials such as bronze, brass, soft steel, cast iron, heavy angles etc. use a 1.8 mm pitch blade.
The taper shank drill should be removed from the machine spindle by means of tool called drill drift.
The drill chucks are held on the machine spindle by means of an arbor fitted on the drill chuck.