Nachreiner with powerful solid carbide drill to remove jammed taps
New internal thread in a wide range of materials can be remanufactured in the shortest possible time
Do you want to repair a tool breakage in internal thread production economically, safely and quick without eroding? With the solid carbide drill to remove jammed taps, E.1619.1 from the tool manufacturer Nachreiner in Balingen-Weilstetten, this is possible in a wide range of materials. Within a very short time, the specially coated drill removes the broken tool without unclamping or damaging the workpiece.
In many cases, internal thread production represents the final work process in a long manufacturing chain. Usually used at the end of the production chain, the taps or formers must constantly deliver high-precision top performance. Since the workpiece often represents a high value at this stage of production, tool breakage must absolutely be avoided, because this leads to expensive rework or rejects. Martin Seifriz, authorised signatory of the Nachreiner GmbH: “Internal threads are mainly produced by thread cutting or thread forming. The advantages of these methods are good process reliability, high productivity and comparatively low tool costs. Despite all caution, however, chip evacuation problems can occur, especially with long-chipping materials, for example when producing blind hole threads. The tap can jam and then break off due to the load.”
Drill out instead of eroding
A good and safe technology to remove broken taps without damaging the workpiece is eroding. Martin Seifriz: “This is a proven process, but often the workpiece has to be unclamped and even taken to an external eroder. Finally, eroding is time-consuming and expensive. Our straight fluted solid carbide drill to remove jammed taps, E.1619.1 with special geometry and reinforced core is an economical and safe alternative. By using the appropriate core tap – we supply metric sizes M 3 to M 12 from stock or all sizes in a practical set – the core of the tap is quickly drilled out and leftovers of the broken tool are cleanly removed from the drill hole.”
The Nachreiner solid carbide drill to remove jammed taps, E.1619.1 can be used in materials up to 65 HRC and is suitable for all HSS-Co taps. The wide range of materials includes among others soft, hardened, stainless or acid-resistant steels, short-chipping cast iron or aluminium alloys up to non-ferrous metals, high-tech special alloys, composite materials and titanium.
The method of operation is simple: The uneven surface of the broken tap is shortly approached or “tipped” several times with the appropriate size of the Nachreiner E.1619.1. to obtain centring. It is recommended to use the tool only with cooling lubricant. For example, for M4: rotation speed S: 6500 rpm, feed rate vf: 50 mm/min, cutting speed vc: 67 m/min, feed per turn f: 0,008 mm/r. The E.1619.1. drills out the core of the broken tap at a uniform feed rate. Afterwards, the user can remove the remains of the broken tap quickly and without leaving any residue. Last but not least, a new thread is produced with another Nachreiner threading tool.
Martin Seifriz: “In contrast to expensive eroding, no unclamping of the workpiece is required and the drilling out takes on average only one to two minutes at the most. Basically, our solid carbide drill to remove jammed taps, E.1619.1 is the economical alternative to eroding. It is a clean, fast method and helps to minimise machine standstills, reduces rejects and thus saves the user significant time and costs.”
