If you need to make a hole in the center of a bolt, a round timber or a similar object, you really need to try hard to drill exactly and maintain alignment. When there is a drilling machine, the task is simplified, and with this device it becomes much easier.
The principle of crafts is quite simple, against the rotating cartridge of the machine for drilling you need to install a second cartridge, fixed rigidly. To do this, a platform is made with the possibility of adjustment along the plane of the bed, in the center of which a stud with a thread for the second cartridge is welded.
The main thing in the holder of the second cartridge is that it is strictly perpendicular to the site on which it is installed. Marks can be made on the surface of the bed in order to quickly mount this device for work.
