Drills - whether they are HSS drills or carbide drills - need to be regularly re-sharpened for optimum performance on drill lines. This applies, of course, to drill systems with a cooling channel as well as to drill systems without a cooling channel.
The inner coolant channel is used for optimum tool cooling directly on the tool cutting edge. On modern drill lines, an air - coolant lubricant mixture is forced through the holes directly into the borehole at high pressure. This mixture optimally reduces the dissipation of the extremely high frictional heat generated during the machining of the steel profiles and steel plates.
Especially in steel construction and steel trading, the popular flat ground joint with a point angle of 170 ° to 175 ° has been in demand for many years. Although the normal 118 ° grinding of HSS drills can be used, it is less economical and is therefore rarely used in this market segment.
The resharpening of an HSS drill or an HSS inner coolant drill is usually carried out by the machine operator at the customer's site, or in the tool dispenser on a suitable drill grinding machine. Our customers also like to send the HSS cooling channel drills for regrinding to the Nenok grinding service.
For the grinding of the professional steel flat ground with the point angle of 170 ° and the centring point, not only a suitable drill grinding machine is necessary, but also the corresponding experience of the machine operator. Do not wait until your drills have already burned out and the cutting area has broken out. Therefore, use our low-cost grinding service for regrinding or shortening your HSS drills. Even if the cutting edge of a drill has broken out, it can be regrounded if the remaining useful length is sufficient.
We grind HSS inner coolant drills in a diameter range of 10 mm to 50 mm from the well-known manufacturers Cleveland, Gühring, Hartner, Nachi, Stock and Walter but also drills offered by dealers under their own brand such as Peddinghaus, Ocean Penetrator Cobald Drill Bits, Nachi Twist Drill Bits, Dittmann-tools, IP-tools or Voortman.
Nenok as a used machine dealer regularly has well-preserved used drill grinding machines for grinding HSS drills and is also interested in buying well-preserved grinding machines.
The regrinding of a solid carbide drill is also widespread and is usually also offered with a secondary coating by the grinding centers of the tool manufacturers or specialist companies. Although you can regrind the solid carbide drills without a recoating, the performance however is somewhat limited by the worn coating on the cutting edge. The carbide cutters for the KSEM tool systems from Kennametal, the HT800 Gühring interchangeable plate system or the Hartner Multiplex Drill System, on the other hand, are usually used up to their limit of use, so that re-sharpening is rarely worthwhile. In principle, however, regrinding of the cutting insert would be possible if used properly.
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