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Drilling machine AIMES Srinivas Integrated Campus Mukka PowerPoint Presentation

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Published on : Jan 08, 2015
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Slide 1 -

Drilling machine

Slide 2 -

Introduction Drilling is a metal cutting process carried out by a rotating cutting tool to make circular holes in solid materials. Tool which makes hole is called as drill bit or twist drill.

Slide 3 -

Drilling machine A power operated machine tool which holds the drill in its spindle rotating at high speeds and when actuated move linearly against the work piece produces a hole.

Slide 4 -

Types of drilling machine. Portable drilling machine Bench drilling machine Radial drilling machine Pillar drilling machine Gang drilling machine Multiple drilling machine

Slide 5 -

Portable drilling machine

Slide 6 -

Bench drilling machine These are light duty machines used in small workshops. Also called Sensitive drilling machines because of its accurate and well balanced spindle. Holes of diameter 1 mm to 15 mm.

Slide 7 -

Bench drilling machine

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parts Vertical main column Base Moving drill head Work table Electric motor Variable speed gear box and spindle feed mechanism.

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working Work piece with the exact location marked on it with the centre punch is clamped rigidly on the work table. spindle axis and center punch indentation are in same line. Machine is started and drill bit is lowered by rotating feed handle. Drill bit touches the work and starts removing material.

Slide 10 -

Bench drilling machine

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Radial drilling machine These are heavy duty and versatile drilling machine used to perform drilling operate on large and heavy work piece. Holes up to 7.5 cm.

Slide 12 -

Radial drilling machine

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parts Heavy base Vertical column Horizontal arm Drilling head

Slide 14 -

working Work piece is marked for exact location and mounted on the work table. Drill bit is then located by moving the radial arm and drill to the marked location. By starting drill spindle motor holes are drilled.

Slide 15 -

Drilling machine operation Reaming Boring Counter boring Counter sinking Spot facing Tapping

Slide 16 -

Reaming It is a process of smoothing the surface of drilled holes with a tool. Tool is called as reamer. Initially a hole is drilled slightly smaller in size. Drill is replaced by reamer. Speed is reduced to half that of the drilling.

Slide 17 -

Reaming

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Boring It is process carried on a drilling machine to increase the size of an already drilled hole. Initially a hole is drilled to the nearest size and using a boring tool the size of the hole is increased.

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Counter boring This process involves increasing the size of a hole at only one end. Cutting tool will have a small cylindrical portion called pilot. Cutting speed = two-thirds of the drilling speed for the same hole.

Slide 20 -

Counter sinking This is an operation of making the end of a hole into a conical shape. Cutting speed = half of the cutting speed of drilling for same hole.

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Spot facing It is a finishing operation to produce flat round surface usually around a drilled hole, for proper seating of bolt head or nut. It is done using a special spot facing tool.

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Tapping Process of cutting internal threads with a thread tool called as tap. Tap is a fluted threaded tool used for cutting internal thread Cutting speed is very slow.

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Specification of a radial drilling machine Power capacity eg: 1.5 hp for drilling motor and 0.5 hp for elevating motor. The range of speed of spindle eg: 50 to 2800 rpm.

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Length of arm on which drill head can traverse. eg: 600 mm. Vertical movement of the arm eg: 500 mm. Angular swing of arm eg: 360˚

Slide 29 -

Range to which drill bit can reach eg: 350 mm to 900 mm. Drill depth eg: 32 mm for steel.

Slide 30 -

Thank you

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