Drilling

Drilling is one of the mechanical cutting processes to create circular holes in a material by machining. This hole is called a bore. Learn more about drilling in metal cutting and which drill is right for you.

There are 2 different types of drilling: Blind holes (SaLo) and Through holes (DuLo). In order to be able to cut a thread in these holes, a core hole drilling must be carried out. Core drill holes are so special because they have a specific dimension that is matched to the thread to be cut. That is why drills of these dimensions are also called core hole drills.

Through hole

Blind hole

Twist drill

Our twist drills according to DIN 345 have a side chip angle of 27°, a point angle of 118° and a Morse taper shank according to DIN 228 Form B. The spirals of the drills are milled in a soft condition.

With our short twist drills, the side chip angle is also 27°, but the point angle varies between 118° and 135°. These drills also have a cylindrical shank. The type N version is intended for normal cutting materials.

There are two manufacturing processes for twist drills: roll-rolled and ground. Roll-rolled drills are produced by heating the blank and then deforming it into a spiral. With ground drills, on the other hand, the helix is made of the fully hardened material. Our drills have different surfaces so that you can distinguish them at first glance: HSS ground drills are bright, HSSE ground drills amber and roller-rolled drills are black.

PowerSpike

The PowerSpike is the highlight of our twist drill range. This HSS drill, ground from solid material, is equipped with a three-face shank, which prevents slippage in the drill chuck and is therefore ideally suited for use in cordless screwdrivers and pillar drills. In addition, the PowerSpike has a self-centering tip which makes center punching superfluous. The cutting tip has parallel milled chamfer grooves, which result in a lower contact pressure and thus reduce the heat development at the cutting tip. The cross cutting edge has also been sharpened. The special geometry of the bevel ensures a clean cutting edge profile when drilling with the PowerSpike.

Center drills

Form R

Form B

Form A

Form C

Centring drills are used for the production of centring holes according to DIN 332.

Due to their short design with a thick shank, it is difficult for the drill to run. The actual hole is then drilled with a twist drill, which is guided laterally. The drills are right-hand cutting, twist fluted, made of HSS steel or hard metal.

There are 4 different shapes of this drill:

Form R (center hole 60° with rounded running surfaces)
Form A (centring bore 60° with straight running surfaces)
Form B (centring hole 60° plus protective lowering 120°)
Form C (centering bore 60° plus truncated conical countersink)

Plate peeling drills

The right-hand cutting plate peeling drills are available with both straight and spiral grooves. They are used to drill stepless holes in the thinnest sheet metal. Pre-drilling is not necessary, as the drill bit has a point according to DIN 1412 C. The drill bit can be used in the thinnest sheet metal. The drilling is burr-free and without deforming the sheet metal. The drill is axial and radial relief ground and has either a straight shank or a hexagonal shank.

Compared to a step drill, the hole is not straight but tapered.

Hole saws

Hole saws

SDS shank

HSS hole saws are used to saw through holes in various materials. The basic body made of tool steel is equipped with a welded HSS toothed ring. The angled arrangement of the HSS saw teeth effortlessly copes with the use in steel and iron sheets, non-ferrous and light metals, wood, plaster, cardboard, plastic, Plexiglas and much more.

The hole saws equipped with an HSS-Cobalt toothed ring can also be used for stainless steels such as V2A+V4A sheet metal. The overall height of the hole saws varies between 55 and 43.5 mm, depending on the size. GSR hole saws are equipped with a so-called variable toothing.

With a Vario toothing 4-6 teeth of different lengths per inch are used alternately (tpt – teeth per inch). In addition, the teeth of the saw are interlocked. This is done to avoid jamming in the material. The saw teeth are bent on one third to half alternately to the right and left (crossed against each other).

Both the SDS and the hexagonal shank holders are each equipped with an HSS ground guide drill. This can be fixed and replaced using a set screw (grub screw M8). The hole saws are fastened differently depending on the dimensions. The smaller hole saws (14-30 mm) have opposite lateral surfaces in order to use a nut wrench to tighten the mounting thread. The wrench widths vary between 16 and 26 mm depending on the size. From 32 mm diameter, the hole saws have 2 or 4 holes for the driving pins. These are fixed with a locking ring to prevent slipping during operation.

Quick-change drill chuck

The clamping of the insert tools is carried out without additional tools. As the cutting edges increase, the chuck also retightens automatically. The chuck can be opened easily even after intensive use of the drill. The high concentricity also makes it possible to use the chuck in CNC machine tools.

Our quick-change drill chucks are available in various designs. On the one hand as sleeve design in metal and plastic, on the other hand as gear rim drill chuck made of metal.