Drilling and Allied Operations

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Presentation transcript:

Drilling and Allied Operations By: Iman Maleki 1383 Autumn

Drill Nomenclature Web Neck Point Shank Web Thickness Flutes Tang Helix Angle Land Body Point Angle Margin

Classes of Drills (I)

Classes of Drills (II)

Drill Sizes Numbered (0.0059-0.4130 in.) Lettered (0.0059-0.4130 in.) Fractional inch (0.0.016-1.75 in.) Millimeter (0.0.016-1.75 in.)

Drill Material Insert Drills HSS TiN coated Material HSS Tungsten Carbide Coat TiN TiC TiCN Al2O3

Drilling Speed • The type of material being drilled. The cutting tool material and diameter. The types and use of cutting fluids. The rigidity of the drill press. The rigidity of the drill The rigidity of the work setup. The quality of the hole to be drilled.

Drilling Feed IPR IPM = IPR x RPM Twist Drill Wear IPM = inches per minute IPR = inches per revolution RPM = revolutions per minute. Twist Drill Wear

Drilling Time & Cost Csx1000 RPM = N = pd Drill feed = f = N x fn Drilling time = T = (L + l)/f Machining cost = C = (Ch x T )/60 Cs: Cutting speed (m/min) L: Drilling depth l: Distance from drill point to workpiece Ch: cost per hr of machine time Fn: feed rate per rev.

Other Drilling Operations Spade Drills length-to-diameter ratios over 100 to1 not available in diameters smaller than 0.75 inch. Penetration exceed by 60 to 100 percent. Indexable Carbide Drills Time consuming in steps

Other Drilling Operations Deep-hole Drilling

Other Drilling Operations Deep-hole Drilling Trepanning greater tool life because of more teeth. Up to 6 inch

Other Drilling Operations Deep-hole Drilling Gun Drilling Systems fast, precision machining

Types of Drill Presses Simple Drill Press

Types of Drill Presses Radial Drill For Big workpiece

Drilling Machine Components Base gray iron or ductile iron casting Column gray cast iron or ductile iron steel Table Head Quill assembly

Size Classification The horsepower of the motor. Twice the distance from the center of the spindle to the inner face of the column The maximum length of quill travel The size of the Morse taper in the spindle The horsepower of the motor.

Drilling Systems Multi Spindle Drilling Gang Drilling

Drilling Systems Turret Drill

Operation Set-up Vises Drill Jigs 3 purpose (W.P.,Tool)

Related Drilling Operations Reaming

Related Drilling Operations Boring

Related Drilling Operations Tapping

Related Drilling Operations Counterboring Countersinking

Related Drilling Operations Centering Spotfacing

THE END