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DEPARTMENT OF PHYSICS

DEPARTMENT OF PHYSICS. PHYSICS WORKSHOP SKILL COURSE CODE- PHYS203 DRILLING MACHINE. PRESENTED BY- PROF. HEM CHAND. Dr illi n g mac hi n e. Drilling is a metal cutting process carried out by a rotating cutting tool to make circular holes in solid materials.

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DEPARTMENT OF PHYSICS

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  1. DEPARTMENT OF PHYSICS PHYSICS WORKSHOP SKILL COURSE CODE- PHYS203 DRILLING MACHINE PRESENTED BY- PROF. HEM CHAND

  2. Drilling machine

  3. Drilling is a metal cutting process carried out by a rotating cutting tool to make circular holes in solidmaterials. • Tool which makes hole is called as drill bit or twistdrill. Introduction

  4. A power operated machine tool whichholds the drill in its spindle rotating at high speeds and when actuated move linearly against the work piece produces ahole. Drillingmachine

  5. Portable drillingmachine • Bench drillingmachine • Radial drillingmachine • Pillar drilling machine • Gang drillingmachine • Multiple drillingmachine Typesof drillingmachine.

  6. Portable drillingmachine

  7. These are light duty machines used in smallworkshops. • Also called Sensitive drilling machines because of its accurate and well balanced spindle. • Holes of diameter 1 mm to 15mm. Bench drillingmachine

  8. Bench drillingmachine

  9. Vertical maincolumn • Base • Moving drillhead • Work table • Electric motor • Variable speed gear box and spindlefeed mechanism. parts

  10. Work piece with the exactlocation marked on it with the centre punch is clamped rigidly on the work table. spindle axis and center punch indentation are in sameline. working  • Machine is started and drill bit is lowered by rotating feedhandle. • Drill bit touches the work andstarts removingmaterial.

  11. Bench drillingmachine

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

  13. Radial drillingmachine

  14. Heavybase • Verticalcolumn • Horizontalarm • Drillinghead parts

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

  16. Reaming • Boring • Counterboring • Countersinking • Spotfacing • Tapping Drilling machineoperation

  17. It is a process of smoothing the surface of drilled holes with atool. • Tool is called asreamer. • Initially a hole is drilled slightly smaller in size. • Drill is replaced by reamer. • Speed is reduced to half that of thedrilling. Reaming

  18. Reaming

  19. It is process carried ona drilling machine to increase the size of an already drilledhole. • Initially a hole isdrilled to the nearest size and using a boring tool the size of the hole is increased. Boring

  20. This process involves increasing the size ofa hole at only oneend. • Cutting tool will havea small cylindrical portion calledpilot. • Cutting speed = two- thirds of the drilling speed for the samehole. Counterboring

  21. This is an operationof making the end of a hole into a conical shape. • Cutting speed = halfof the cutting speed of drilling for samehole. Countersinking

  22. It is a finishing operation to produce flat round surface usually around a drilled hole, for properseating of bolt head ornut. • It is done using a special spot facingtool. Spotfacing

  23. Process of cutting internal threads witha thread tool called as tap. • Tap is a flutedthreaded tool used for cutting internal thread • Cutting speed isvery slow. Tapping

  24. Power capacityeg: 1.5 hp for drilling motor and 0.5 hpfor elevatingmotor. The range of speed of spindle eg: 50 to 2800rpm. Specificationof a radialdrilling machine

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

  26. Range to which drill bit can reach eg:350 mm to 900mm. Drill depth eg: 32mm forsteel.

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