This is a easy question, what you need is just a electric drill with High-cobalt drill and carbide drills can drill stainless steel.
Carbide drill: A drill used in core drilling. The steel cylindrical bit body is named for its carbide-cut carbide tool with tungsten carbide. The shape of the cemented carbide cutting tool and the number of its welding on the drill bit, the arrangement and the welding angle are called the bottom edge, the inner edge and the outer edge to ensure the gap between the water and the powder. The upper part of the bit body is a threaded connection core tube, the side of the bit body is provided with a water tank, and the bottom lip surface is also provided with a water nozzle. Both the sink and the nozzle ensure the circulation of the rinsing liquid, and the function of removing the rock powder and cooling the drill bit is achieved. In order to increase the clearance when drilling into the clay layer and the shale formation, the ribs are welded to the inner and outer sidewalls of the hard alloy drill bit, which is called a rib type drill. A needle-shaped carbide self-grinding drill can be used for a hard layer having high abrasiveness. Generally, hard alloy drill bits are drilled into rock formations of grade II-VII; needle-shaped carbide drills can be drilled into VI-VIII grade rock.
Stainless steel is characterized by high toughness and easy sticking. Therefore, the hardness of the drill bit is required to be high, the surface finish is good, and the apex angle of the drill bit is larger than that of the ordinary drill bit (between 130 and 135 degrees). At the same time, cooling should be sufficient. And the amount of feed is greater than 0.15mm to avoid cutting as much as possible in the cold hardened layer. The cutting speed is as low as possible to reduce the cutting temperature. The cutting fluid uses a concentrated emulsion. Commonly used stainless steel drill bits are: High cobalt drill bit (m35 drill bit, m42 drill bit), of which m42 drill bit is the best price/performance ratio. Carbide drills are also available, but at a higher price.
