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???? ???? ?? ??? ???? ??? ??? ??? ?? ??????. ?? ?? ???“????”????? ?? ??? ??? ?? ? ???? ??? ??? ?? ?? ?? ? ? ????. ????? ???, ?? ??? ?? ???? ? ????. ????? ??? ?? ????? ??? ??? ?????. ?? ??? ??? ?? ??? ????? ?? ??? ??? ?????.

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????? ?? ????? ???, ?? ? (HSS) ? ?? ?? ??? ?????. ? ? ?? ??? ??? ???, ??? ??, ???, ?? ? ?? ?? ??? ?? ??? ?????.

??? ??? ?? ?? ???? ?? ? ?? ??? ?? ? ?? ? ? ??? ?? 250 ℃? ?? ?? ??? ????. ??? 200 ℃ ???? ???? ???? ??? ??? ?? ??? ????. HSS? ???? ??, ?? ???? ? ??? ?? ??? ??? 500 ℃?? 60HRC? ????? ?? ?? ???? ?? ?? ??? ?????? ?????. HSS ??, ????? 800 ℃?? ?? ? ??? ??? ?? ??? ?????. ? ? ?? ??? ??? ?? ??? ??? ?? ????. ?? ?? ??? ??? ??? ??? ??? ??? ?? ???.

???, ??? ?? ?? ???? ???? ??? ??? ???? ????. ??? HSS? ??? ?????. ???? ?? ?? ?? ??? ????? ?? ?? ??? ?? ?? ??? ??? ?? ? ??? ??????. ??? ???? ?? ? ?? ?? ? HSS ??? ?? ? ?? ?? ???? ?????.

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??? ? ??? ?? ?? ???? ???? ??? ???? ??? ????. ???? ?? ?? ?? ??? ????. ?? ???? ???? ??? ? ????. ????? ?? ??? ??? ?? ? ????. ??? ??? ??? ?? ?? ??? ??“?? ??”? ????.

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Sharpening – a bit fiddly as it has to be done by hand. Sharpen the point and spurs with a fine file or edge of a fine grindstone; the angle between the point and spurs should be 90° 

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Spade bit for electric drilling only, the center point is in the position of the bit, and the flat steel on both sides cuts off the wood. These bits are used to drill fairly large holes. They provide a flat bottom hole (with a central point), so it is ideal where the head of the bolt/bolt needs to be embedded in wood – this bit must be used before drilling through the hole of the bolt.

Larger bits require fairly powerful bits to drill deep holes. Drill bits produce a lot of debris when they run out of the back of the workpiece – using sacrificial backplane or tape can reduce debris. Noteworthy spade bits are not suitable for enlarging existing holes.

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This is a circular saw for cutting holes of large, fixed, diameter0 in wood. It’s usually cut to a depth of 18 mm or deeper. It is best used on low-speed power drills because the saw blade will cut through the whole board. In addition, there is a combination hole saw. Like the circular saws above, these combined saws can cut large holes, but they consist of many circular saws of different sizes, usually between 25 and 62 mm in diameter. Normally, the blade is fixed by a radial screw in the “head”. Before inserting a screw to fix the required diameter blade, all blades (except the required size) will be removed. It is best used on low-speed power drills cause the drill-through thing.

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Auger bit is an ideal tool specialized for drilling large diameter and deep holes in wood or thick wood-based panels. Generally speaking, spiral drills can only be used on hand drills. The drill will cut clean, deep, flat-bottomed holes. A single straight tooth cuts and defines the edge of the hole, while a chisel cuts the edge to remove waste from the previous cutting circle. Hold the wood in the center of the thread and pull the drill into the wood. This “pull” action means that the bit is not suitable for use in electric drills.

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