Observation of Drilling Burr and Finding out the Condition for Minimum Burr Formation

Table 1

Experimental conditions.

Machine tool	Radial drilling machine, Make: Energy Limited, India, Model: RDH-32/930
	Main motor power: 1.5 kW
Tool holder	R/L 265 ME-20 AL, Make: Sandvik Asia Limited, India
Cutting tool	Taper shank, uncoated 14 mm diameter HSS twist drill, Make: Miranda (India)
Workpiece material	Low alloy steel, hardness: 225 HB
	Composition: C (0.17%), Si (0.21%), Mn (0.63%), P (0.09%)
Workpiece size	100 mm × 50 mm × 6 mm
Cutting velocity	20, 25 and 31 m/min
Feed	0.032, 0.05 and 0.08 mm/rev
Environment; Experiment sets	Dry and water-cooled
	I—Drilling in dry condition without any back-up support or edge bevel
	II—Drilling with water cooling without any back-up support or edge bevel
	III—Drilling in dry condition with a back-up support
	IV—Drilling in water-cooled condition with a back-up support
	V—Drilling in dry condition with 31° exit edge bevel
	VI—Drilling in water-cooled condition with 31° exit edge bevel