10.A] Describe the Construction and working of an upright Drilling Machine
Answer:-
Upright drilling machine:-
- The upright drilling machine is designed for handling medium-sized workpieces.
- Though it looks like a sensitive drilling machine, it is larger and heavier than a sensitive drilling machine.
- Holes of diameter up to 50mm can be made with this type of machine.
- Besides, it is supplied with a power feed arrangement.
- For drilling different types of work, the machine is provided with a number of spindle speeds and feed.
Base
- The base is a rectangular casting made of cast iron and so can withstand vibrations.
- It is mounted on the floor. It supports all the other parts of the machine on it.
Column
- The column stands vertically on the base at one end. It supports the work table and the drill head.
- The drill head has a drill spindle and the driving motor on either side of the column
Table
- The table is mounted on the vertical column and can be adjusted up and down on it.
- The table has ‘T’-slots on it for holding the workpieces or to hold any other work holding device.
- The table can be adjusted vertically to accommodate workpieces of different heights and can be clamped at the required position.
Drill head
- Drill head is mounted on the top side of the column.
- The drill spindle and the driving motor are connected by means of a V-belt and cone pulleys.
- The motion is transmitted to the spindle from the motor by the belt.
- The pinion attached to the handle meshes with the rack on the sleeve of the spindle for providing the drill the required down feed.