Hole saw

A hole saw is a used in conjunction with a drill saw, with which circular holes limited depth can be cut into different materials.

Construction and application

The hole saw as a whole is composed of three parts: a shank ( which saw blades and centering receives and is clamped in the chuck of a drilling machine ), a drill (it is clamped to the center of the receiving shaft, and serves to center ), and a saw blade to the desired diameter.

The hole saw allows large caliber, form-fitting holes, for example, pipe penetrations, plug and switch boxes in wood, insulation and plasterboard. Only little material is removed, since only a center hole and a circular saw cut in the material to be machined is formed. The maximum depth of the hole results from the height of the blades used.

The saw blade to be used is hooked by means of a bayonet catch into the corresponding groove of the receiving shaft and thus remains during the machining process in its position. The hole saw can be used only in one direction of rotation, firstly because the blades cutting work only in one direction and the other act, the closures of the blades in one direction only. Working with hole saws places increased demands on the torque of the drill.

Spot weld cutter

The Spot weld cutter is a special design of the hole saw. It consists of a clamping shaft, in which a centering point is resiliently mounted, and a nut screwed onto the shank of the small drill bit. The holes are about the size of a welding point, ie typically between 5 and 10 millimeters in diameter.

The Spot weld cutter is used to open a spot weld two pieces of metal, ie wegzubohren the spot weld in the upper sheet to perforate without the underlying sheet. When boring the welding point, the center point does not penetrate into the sheet, but the drill bit cuts the material around the spot weld to the bottom plate by.