In a typical sensitive drilling machine, tool is held in a

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UPRVUNL JE ME 24 Oct 2021 Official Paper (Shift 2)

Answer 1

Explanation:

Sensitive drill machine:

This type of drilling machine is used to drill small holes at high speeds in lighter jobs or workpieces.
The machine may be mounted on the bench or floor & the drilling work is started with the drill fed into the workpiece by purely hand control.
Hand-feed permits the operator to sense the progress of the drill into the workpiece, so that if there is any drill worn out or jams it may be released immediately to prevent the drill bit from breaking.
Since the operator senses the cutting action at any instant it is called the sensitive drilling machine.
These machines are capable of drilling small holes of diameter as small as 0.35 mm to 15 mm. These machines run at a higher speed as high as 2000 rpm.

Diagram of drilling tool:

here, we can see the shank is holding part of the drill which is held by the spindle.

drill3