TYPES OF DRILLING MACHINES

 Types of drilling machines🤔

. name the types of drilling machines

. identify the parts of bench and pillar      type drilling machines

. compare the features of the bench and    pillar type drilling machines.

The principal types of drilling machines are the sensitive bench drilling machine and pillar drilling machine. The column drilling machine and the radial arm drilling machine. (You are not likely to use the column and radal type of drilling machine now. Now explain only sensitive and pillar drilling machine)

The sensitive bench drilling machine

The simplest type of a sensitive drilling machines.This is used for light duty work

This machine is capable of drilling holes up to12.5mm diameter. The drills are fitted in the chuck or directly in the tapered hole of the machine spindle. For normal drilling, the work surface is kept horizontal. If the holes are to be drilled at an angle, the table can be tited. Diffent spindle speeds are achieved by  changing the belt position in the stepped pulley.

The pillar drilling machine

This is an enlarged version of the sensitive bench drilling machine. These drilling machines are mounted on the floor and driven by more powerful electric motors. They are used for  heavy duty work. Pillar drilling machines are available in different sizes.

Large machines are provided with a rack   and pinion mechanism for moving the table for seting the work