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Drilling Machine SRM University PowerPoint Presentation

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Slide 1 - Drilling Machine…
Slide 2 - Drilling Drilling is the operation of producing circular hole in the work-piece by using a rotating cutter called DRILL. The machine used for drilling is called drilling machine. The drilling operation can also be accomplished in lathe, in which the drill is held in tailstock and the work is held by the chuck. The most common drill used is the twist drill.
Slide 3 - Drilling Machine It is the simplest and accurate machine used in production shop. The work piece is held stationary ie. Clamped in position and the drill rotates to make a hole. Types :- a) Based on construction: Portable, Sensitive,Radial, up-right, Gang, Multi-spindle b)Based on Feed: Hand and Power driven
Slide 4 - Sensitive Drilling Machine Drill holes from 1.5 to 15mm Operator senses the cutting action so sensitive drilling machine
Slide 5 - Up-Right Drilling Machine Drill holes upto 50mm Table can move vertically and radially
Slide 6 - Radial Drilling Machine It the largest and most versatile used fro drilling medium to large and heavy work pieces.
Slide 7 - ppt slide no 7 content not found
Slide 8 - Drill Materials The two most common types are 1. HSS drill - Low cost 2. Carbide- tipped drills - high production and in CNC machines Other types are Solid Carbide drill, TiN coated drills, carbide coated masonry drills, parabolic drills, split point drill
Slide 9 - ppt slide no 9 content not found
Slide 10 - Drill fixed to the spindle Drilling operations Drilling Centre Hole Drilling Deep Holes Drilling Thin Material Drilling Pilot Hole
Slide 11 - Tool Nomenclature
Slide 12 - Tool Holding devices The different methods used for holding drill in a drill spindle are By directly fitting in the spindle hole. By using drill sleeve By using drill socket By using drill chuck
Slide 13 - Work Holding Devices
Slide 14 - Drilling operations… Operations that can be performed in a drillin g machine are Drilling Reaming Boring Counter boring Countersinking Tapping
Slide 15 - Operations in drilling machine
Slide 16 - Operations in drilling machine
Slide 17 - Types of cutters Reamers :- Multi tooth cutting tool Accurate way of sizing and finishing the pre-existing hole. Accuracy of 0.005mm can be achieved Boring Tool:- Single point cutting tool. Boring tool is held in the boring bar which has the shank. Accuracy of 0.005mm can be achieved.
Slide 18 - Types of cutters Countersinks :- Special angled cone shaped enlargement at the end of the hole Cutting edges at the end of conical surface. Cone angles of 60°, 82°, 90°, 100°, 110°, 120° Counter Bore Tool:- Special cutters uses a pilot to guide the cutting action . Accommodates the heads of bolts.
Slide 19 - Counter bore and spot facing
Slide 20 - Types of cutters Combined Countersinks and central drill :- Special drilling tool to start the hole accurately. At the end it makes countersinks in the work piece. Gun drill :- Machining of lengthy holes with less feed rates. To overcome the heating and short life of the normal drill tool
Slide 21 - Types of cutters Tapping:- For cutting internal thread Multi cutting edge tool. Tapping is performed either by hand or by machine. Minor dia of the thread is drilled and then tapping is done.
Slide 22 - Work Holding Devices 1. Machine Table Vice
Slide 23 - Step Blocks Clamps V-Blocks Angles Jigs T- Slots Bolt Work Holding Devices
Slide 24 - Definitions Cutting Speed (v):- It’s the peripheral speed of the drill v = *D*N where D = dia of the drill in m N = Speed of rotation in rpm Feed Rate (f):- It’s the movement of drill along the axis (rpm) Depth of Cut (d):- The distance from the machined surface to the drill axis d = D / 2
Slide 25 - Material Removal Rate:- It’s the volume of material removed by the drill per unit time MRR = ( D2 / 4) * f * N mm3 / min Machining Time (T) :- It depends upon the length (l) of the hole to be drilled , to the Speed (N) and feed (f) of the drill t = L / f N min
Slide 26 - Precautions for Drilling machine Lubrication is important to remove heat and friction. Machines should be cleaned after use Chips should be removed using brush. T-slots, grooves, spindles sleeves, belts, pulley should be cleaned. Machines should be lightly oiled to prevent from rusting
Slide 27 - Safety Precautions Do not support the work piece by hand – use work holding device. Use brush to clean the chip No adjustments while the machine is operating Ensure for the cutting tools running straight before starting the operation. Never place tools on the drilling table Avoid loose clothing and protect the eyes. Ease the feed if drill breaks inside the work piece.
 

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