MTS Chipbreaker Drills

The Chipbreaker Concept

This outstanding development increases drill cutting efficiency by means of greatly improved chip control. A chipbreaker rib is positioned along the length of the flutes, which curls and breaks long chip forming material into small manageable chips in the flutes, as small chips flow freely along the flutes. The chipbreaker drill thus cuts more freely than standard drills.

The small chips also permit coolant to flow more freely to the drill point, giving improved heat dissipation and drilling performance. As the chipbreaker rib extends down the entire flute length, the chipbreaker form and effect is retained even after conventional sharpening. The chipbreaker rib gives rigidity, markedly increasing the number of holes per re-grind, even where chip control is not considered important.

Chipbreaker Coolant Feed Drills

The benifits of providing coolant internally directly to the drill cutting edge include higher cutting speeds (reduced times by up to 75%), higher feed rates, longer tool life (3 to 10 times), and less frequent resharpening. In addition they provide a superior finish.

The coolant assists in clearing chips from the drill point and it's pressure forces the swarf along the flutes of the drill facilitating drilling to greater depths without repeated withdrawal to clear swarf.

Coolant tubes or holes are located away from the drill web, thus not affecting web strength. Both variants connect to all coolant systems.

Coolant can be provided by the normal coolant pump supplied with most machines using soluble oil. However, we recommend using a mist coolant at a pressure of 500 to 800 kPa (80 to 120psi). This method is clean and efficient, eliminating the problem of collecting, filtering and re-using the coolant.

Somta offers a range of Morse Taper Shank Chipbreaker Drills, with variations in point angle, HSS grade and coolant feed options.

Standard drill in action

Chipbreaker drill in action

HSS Material Grades

M2
Most chipbreaker drills are manufactured from M2 standard High Speed Steel material. M2 products have a black oxide steam tempered finish.

M35
We also offer M35 High Speed Steel to extend product life even further due to the superiority of M35 over M2. All M35 products are finished with a Gold Oxide surface treatment to differentiate from the M2 steam tempered finish.

Coolant Feed Styles

Normal Chipbreaker This is the usual configuration of the Chipbreaker Drill, which has no coolant feed.
Oil Tube Chipbreaker Coolant is fed through shank cross holes into oil tubes which are inserted into a groove which runs down the length of the flutes. Oil is fed from the tubes at the outer edge of the point diameter directly onto the workpiece, cooling the workpiece and stimulating small chip evacuation. Because the chipbreaker rib breaks up long stringy chips into small pieces there is no chance of chips snagging and removing the coolant tube.
Oil Hole Chipbreaker As in the oil tube version, oil is fed into shank cross holes which are connected to internal holes which run down the drill flute length in a helix form. The oil is fed from holes at the drill point onto the workpiece with the same benifits as the oil tube version. The difference with the oil hole version is that the holes at the point are located closer to the centre of the drill. The advantage of the oil hole version is that the helix is located below the surface of the flute, whereas the oil tube is recessed into the flute surface.

Chipbreaker Product Codes & Features

The following table represents the standard range of Morse Taper Shank Chipbreaker Drills stocked by Somta.