Language And Communication

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