Page 40 - CITS - Fitter - Trade Theory

FITTER - CITS

The drilling machine is one of the machine tool variants that has undergone extensive study and development in
metalworking. Because of its multi-tasking and handy design can accomplish various drilling and boring jobs in a
single stop. In the early twentieth century, the drilling machine evolved from the milling machine design.
Since then, numerous machining centers have been extensively employed for professional and precise purposes
in various sectors, contributing to the advancement of industrial achievement. With the market acceptance of
multi-spindle technology, multi-spindle drilling machines have been embraced in multiple stages.
The milling and drilling operations on a single multi-spindle drilling machine may fulfil a wide range of machining
needs. This capability is based on the various tracks attached to the axes, which allow the cutting tool to travel
around the work piece.
The client’s demands determine the number of axes on multi-spindle drilling machines. There is no ultimate ideal
number; simply the most appropriate decision based on user demands. Unlike lathes, a multi drilling machine can
perform a broad range of operations, from single microscopic pieces to heavy and massive gang milling.

Deep hole drilling machines
Deep hole drilling machines are metal cutting machine tools that can create very deep and extremely precise
holes in just about any metal. Manufacturers relying on deep hole drilling machines can further

optimize the process by using tools such as BTA and gun drills. It’s a prominent method in engineering materials
and components used across numerous sectors. In this article, we take a quick look at how deep hole drilling
machines work, the processes and some of the most common applications.
Deep hole drilling machines are used when a project requires high-precision round bores. It can produce holes
that are within extremely tight tolerances, providing incredible accuracy compared to standard drilling methods.
Using special tools and setups, these gun drilling machines deliver high-pressure coolant, and cleanly evacuate
chips while achieving depth-to-diameter holes beyond the capabilities of a normal CNC machine.
This process is unique in that it can measure residual stresses at a microscopic level with a penetration of over
750 millimeters (30 inches), without completely destroying the original component. There are essentially three
basic types of deep.
Automatic drilling
Automated drilling is the control of drilling by automatic means. The aim of automated drilling is to reduce human
intervention to a minimum. A combination of control systems and information technology tools are used to
implement automated drilling.
Widespread use of automated drilling can be seen in machines which employ CNC (Computer Numerical Control).
These machines commonly employ stepper motors and servo motors to achieve precision and instructions based
on a CAD are sent to the machines through software to achieve the finished product.
The feedback from the surface that is worked on is also collected and the further steps are constantly adjusted
with the feedback.

Safety precautions
Wear safety eye protection while drilling.
Let the spindle stop of its own accord after turning the power off.
Never try to stop the spindle with your hand.
Plexiglas and other brittle plastics can be difficult to drill.

25

CITS : CG & M - Fitter - Lesson 4 CITS : CG & M - Fitter - Lesson 4