Last Monday, we were asked to present about technical description of a drilling machine using microsoft word, so here are the technical description about drilling machine.
DRILLING MACHINE
Drilling
machine is a machine for making holes with removal of chips. Drilling machines
are used for drilling, boring, countersinking, reaming, and tapping.It consists
of stepped pulley for speed changing,belt,belt guard,motor controls,driving
motor,spindle lock,depth gauge and stop,chuck,column,spindle axis,worktable and
base.
A drilling
machine has a large steel base for stability.It takes drills up to 12.5mm diameter and the
spindle speed is varied by altering the belt position on the stepped pulley.
The feed is operated by hand through a rack and pinion. The type of feed
mechanism enables the opertator to ‘feel’ the progress of the drull through the
material being cut.
There are 4
types of drilling machine used in engineering workshops : The Bench Drilling
Machine, The Pillar Drilling Machine, The Column Type Drilling Machine and The
Radial Arm Drilling Machine.
To drill an
object using the drilling machine,intially, a centre punch is used to mark the
workpiece.The work that is marked by centre punch later is set on a worktable.Then, the drill bit is adjusted
according the size needed in the operation sequence. After that, the work piece
that will be drilled is set on the workbench.This is the portion of the depth
value.
Next, the
depth of the centre punch is set with the drill chuck’s fine with chuck key.
The marking out are then moved to the work’s surface by steadily moving it to
the drill chuck along the surface plate. The depth of the hole also can be
controlled. Later, the spindle lock is locked and the “power” button that is on
side of the drilling machine is pressed to turn on the machine. The drill bit
is turned and lowered by rotating the feed handle. Finally, the drill bit is
lowered on to the marked point for drilling and then, the machine is turned off
when you are done drilling the work piece.
To prevent injuries, It
is made sure that the workpiece is supprted by a holding device and not by
hand. Brush is used to clean the chips or sawdust .It is to ensure that the
cutting tool is running straight before starting the operation. Loose clothing
is should be avoided and safety googles should be worn at all times when
drilling. The feed is eased if drill breaks inside the workpiece.Machine guards
and drill bit should be returned to the correct place after it is being used