Many people would say that the drill bit is easier to break when it is lengthened, and the cutting edge must be very symmetrical. If it is too long, it is easy to bend and the center is asymmetrical, that is, the concentricity is not good enough. However, it is undeniable that after lengthening the drill bit, although the above situation may sometimes occur, in most cases, it will help you. If you do not need an extra long wood drill bit , many people will not choose to lengthen it. The above situation is a long time ago, or it is handmade, or there are some problems when using long drilling technology. At the time, this technology was not yet mature. It is not yet mature, so these issues have not yet been resolved. However, with the maturity and development of technology, the above situation has been basically resolved, so the current expanded auger has appeared.
However, there are still many people who choose to make their own extended augers, so what should be paid attention to when making them? When some people expand the drill bit by themselves, a common problem is that they are inconsistent with the original drill bit. Therefore, it is best to drill a drill with a depth of 20 and a wall thickness of 2-3mm (depending on the diameter of the drill) at the end of the drill. ) Determine the extension handle according to the size. According to the amount of interference, the extension rod closely matches the rotation step length. The smaller size is about 22, leaving welding grooves and back steps. The diameter is approximately 2mm larger than the drill bit. The gap will remain after assembly. The gap is welded by argon arc welding, and then the excess size of the rear end is closed according to the outer diameter of the drill bit. Always pay attention to maintaining concentricity.
The longest drill bit is about 10,000 meters. The former Soviet Union is experimenting. It uses a drill bit to drill down more than 10,000 meters. In the UK, this type of drilling still exists abroad. For more detailed information about wood drill bits, please visit: TCT circular saw blades .