We’ve selected a few of the most popular coatings to keep things simple, so let’s jump in.īright Finish is a funny term because these drill bits are actually uncoated. Coatings extend tool life and improve cutting performance. Throw a good coating on any drill bit and you’ll completely change its characteristics. Will outlast M42 Cobalt by at least a factor of 10-20.Allows for Through Spindle Coolant system or TSC.Provides the best heat and chip resistance.Can be run much faster (three to five times), decreasing the time needed to produce holes.The most expensive in terms of up-front costs.This also helps to prevent wear, which is nice since TSC drill bits are pricey. In situations where you’re drilling deep into very hard materials, the feeding of coolant through the drill allows for better chip evacuation and self-cooling. If you’re running a CNC or frequently use a drilling press, this material is worth the investment.Ĭarbide drills allow for a Through Spindle Coolant system or TSC as it’s known. This makes Carbide a bad choice for hand drilling. One characteristic of Carbide is that it’s brittle, so it won’t flex. A C arbide drill will outlast a C obalt drill by at least twenty times, reducing the cost-per-hole significantly. Solid Carbide drill bits are the most expensive but they will outlast other drill bit materials by a longshot. You can pretty much expect the same characteristics as a standard HSS drill, but with increased performance across the board.ġc. M42 Cobalt is high-speed steel with 8-10% Cobalt added in order to increase the hardness and endurance of the tool.
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