UNIT-2 MACHINING.

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Presentation transcript:

UNIT-2 MACHINING

Drilling machine Classification of drilling machines: Drilling is the process of producing hole on the work piece by using a rotating cutter called drill. The machine on which the drilling is carried out is called drilling machine. Classification of drilling machines: Portable drilling machine Sensitive drilling machine Bench type Floor type

3. Upright drilling machine Round column type or pillar type Box column type or square section type 4. Radial drilling machine Plain type Semi- universal type Universal type 5.Gang drilling machine 6.Multiple spindle drilling machine 7. Automatic drilling machine 8. Deep hole drilling machine

Radial drilling machine

The following adjustments are available in this type Plain type The following adjustments are available in this type Vertical movement of the radial arm with respect to the column Circular movement of the radial arm about column Horizontal movement of the tool along the arm ways. 2. semi- universal type In additional to above three movements as in case of plain type, the fourth movement of the tool post can be swung about a horizontal axis perpendicular to the arm. This arrangement permits for drilling a hole inclined at any angle to the horizontal plane.

3. Universal type: The fifth movement of the radial arm is rotated (tilted) on a horizontal axis. All these movements enable the universal drilling machine to drill on a job at any angle either in horizontal plane or in vertical plane or in both the planes.

Specification of drilling machine Maximum size of the drill in mm that the machine can operate Maximum spindle travel in mm Number of spindle speed & range of spindle speeds in r.p.m Power input of the machine H.P Floor space required in m² Net weight of the machine in Tonne

SEMI -AUTOMATIC LATHES In semi automatic lathe, the required tools are preset. More than one tool can be used at a time to perform the specific task It reduce tool- changing time, loading & unloading time & increases the rate of production

Capstan and Turret lathe

grinding Grinding is a metal removing process in which the metal is removed with the help of rotating grinding wheel. Grinding is mainly used for following purposes: To remove small amount of metal from work piece and finish them to close tolerances. To obtain a better surface finish To machine hard surfaces that cannot be machined by high speed steels Sharpening of cutting tools Grinding of threads Sometimes, it is used for removing bigger stocks of metals

Cylindrical grinder

Types of cylindrical grinding Plain centre type cylindrical grinding machine Centre type universal grinder Centre type universal grinder

Plain centre type cylindrical grinding machine