Is the speaker hole mechanically cut out of the speaker? Seek professional know-how

To do the speaker's material is generally two kinds, one is made of wood, the other is compressed synthetic board (that is, plywood and other panels), open the hole is useful for large round planning set the circle, the use of round chisel chisel to go. Mechanized, some people use a bench drill, their own iron plate (iron plate size according to your maximum diameter of the hole to calculate) modification, this round iron plate from the middle of the welded bench drill chuck; the other side of the welded threaded fixed head, the fixed head purpose is to locate and prevent vibration caused by deviation. And then in the radius of the round iron plate holes to install the fixture, this fixture is used to install the lathe tool, and you can adjust the distance, when you want to drill large-diameter holes, the fixture will be moved out of the outer radius. The whole table drill is fixed to the table, and the two sides of the table are installed with table clamps to fix the speaker board. How to work: first the speaker board with a large circular gauge to draw a good circle, and then put the board under the table drill, the drill (fixed head) aligned with the round hole right in the middle, adjust the position and use the table vise to clamp the speaker board, open the table drill, the first is the drill bit drilled into the positive circular hole, and then it is the turning tool in the top of the high-speed drawing of holes, quickly drilled through. Some people also use this machined large drill bit on the pistol drill, but to control, vibration is very strong. This big drill processing method is not too troublesome, you can directly in the middle of the round iron plate holes, and then plug into a section of rebar, with a level ruler to adjust the vertical and then welded with electric welding, and then take it to the lathe processing, one end of the car into the threads, and the other end of the machine with a grinding machine to make it a square (can be inserted into the mouth of the table drill can be). As for the lathe jig, depends on what kind of jig you buy, in short, can be flexible inside and outside the move can be. The sharper the cutter, the better it is, the higher the speed of rotation in the table to drill a hole in the effort.