Auram Machines [India] Private Limited supplies Deep Hole Drilling Machine. Auram Machines [India] Private Limited manufactures assorted range of drilling and tapping machines. Deep Hole Drilling Machine is used in various industries. When the ratio [L/D] is more than 3, the operation is called as `Deep-hole drilling` A drilling operation with L/D ration 3o is also possible within our manufacturing range. Wood-pecking cycle, high pressure-chilled coolant, slide feed units these are some of the basic features of the units.