Guhring is the first manufacturer world-wide to offer carbide tools for internal and external de-burring operations. This, however, does not involve machining in the fullest sense of the word - as with, for example, conventional drills, milling cutters, taps, reamers and countersinks. Instead, the de-burring tool very carefully shaves off the burr and can also, if required, create a chamfer or radius.

All the de-burring tools are special tools that are optimised exactly to the costumer's specific application task. Cutting edge geometry and the number of cutting edges, coating, tool length and diameter, shank form etc. can all be chosen as required.

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The operating principleof the de-burring fork is simplicity itself. The nominal diameter of the de-burring fork is marginally smaller than the diameter of the hole to be de-burred. However, the tool is split in the cutting portion area so it can, with the assistance of a pivot located externally in one of the forks, be pressed together and fed through the hole. When this pivot exists the other end of the through hole, the fork expands again and is accurately positioned in the hole. The length of the split in the cutting portion as well as a defined pre-tension determines the pressure exerted by the fork against the workpiece. Up to three cutting edges are positioned externally on the de-burring fork and perform the internal de-burring operation of the hole. The positioning and design determines if the tool is merely performs a de-burring operation or also produces a chamfer or radius.

The de-burring lance works according to an entirely different principle. The diameter of this tool is considerably smaller than that of the through hole and possesses coolant outlets on the one side. Through the high-pressure coolant supply and the lateral coolant exit the de-burring lance is bent, so to speak, until in contact with the workpiece.
According to the application, different cutting portions can be postioned at the end of the de-burring lance in order to achieve the required results from the de-burring process. The coolant pressure determines the pressure with which the cutting portion sits against the workpiece.
With this design the swarf is washed out of the hole simultaneously and it is also possible to combine this procedure with high-pressure de-burring (up to 2000 bar).

These special tools are used to produce sharp-edged, but de-burred exits of through holes in the workpiece. The burr is cut off by sharp spirals and is removed from the bore hole.

In addition to the de-burring lance, Guhring also offers de-burring milling cutters for external de-burring operations. These tools can also be equipped with different cutting edge geometries in order for de-burring operation to produce a chamfer or radius on the different workpiece materials.

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are intelligently drawn together in the new, modular end operating system GE 100 from Guhring, a tool capable of carrying out these operations in one pass, quickly and accurately. One could say:
The GE 100 converts automatic lathes into machining centers.

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The end operating system GE 100 puts no limits on your creativity. Modular construction, radially and axially adjustable short clamping holders as well as special practice-orientated indexable inserts make the GE 100 universally applicable, especially for shaft, pipe and casing operations.

The main application area is to be found on machines for end operations. It is intended for such operations as spot facing and centering. But also for stripping clamping pilots, facing, outer chamfering and centering (in preparation for CNC machining operations). Or for coning of bar stock for further operations on automatic machines. Even for the machining of casings or mountings, i.e. capping, radius operations or face piercing operations on machining centers, multiple station and special machines. In short, we now offer you an additional tool alternative for the:
- automative industry, motor manufacturers   (gearing, shafts, bushes)
- pipe fittings industry
- mountings industry
- steel manufacturers (coning of bars for automatic   machines)

Standardized tools are generally less expensive, but they are rarely as efficient as special tooling. This is not the case with the GE 100. This well thought-out, standardized, modular design is remarkable in its flexibility regarding diameter, precision and tool material. The GE 100 can be applied for machining diameters of between 15 and 240 mm. The tool head permits the application on all standard machine adaptors, also on all rapid change systems. By switching the clamping holders or clamping sleeves, one can machine other workpieces with one and the same basic support, i.e. tool head. The bore hole in the tool head serves as a clamping sleeve adaptor for center drills, step drills, form drills or boring bars.

The set-up of the axially and radially adjustable tool holders proceeds via a set screw with a hexagon socket, the clamping proceeds via twin V-wedges. The twin V-wedges are arranged so that the common problem of self-locking no longer occurs and no longer hinders the setting-up process. Two hexagonal keys are sufficient in order to mount or re-equip a complete tool head. The insert program for tool holders is especially designed for the requirements of end operations.

There are two designs available: one precision design and one standard design. Indexable inserts with chip breaker grooves produce short controlled chips, absolutely necessary when carrying out multiple cutting operations. Efficiency is greatly increased with a four cutting edge arragement. Other indexable inserts, however, are also available.

- Combination of several operations into one
- Modular design, i.e. shorter delivery times and   lower cost
- Absolute one-hundred percent facing and circular   concentricity due to the rotation of all cutting   edges.
- Axially and radially adjustable tool holders,   thereby increased application ranges for each   holder size
- Precision ground indexable inserts with optimized,   application-orientated chipbreakers ± 0,013 mm   indexing
  precision.
- Separation point on short taper can fit all tool   adaptors
- Tool heads with 2, 3 or 4 adaptors for tool holders,   independent of the machining diameter
- Tool heads with bore hole for receiving clamping   sleeves for center drills, step drills, etc.
- Easy operation, clamping of the drilling tool   possible from the outside without need for   dismanting the tool holder

Use the GE 100 and you will save valuable machining time. Direct impact on cost reduction and consequently on your competitiveness. We are convinced and would be happy to convince you, too.

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Cost and time reduction is also the main reason for the request for tools for drilling and tapping in hardened steels. When holes and threads are produced in the yet unhardened steel, the workpiece requires clamping and unclamping twice: First the workpiece is clamped to drill and tap the unhardened steel. It is then unclamped to be hardened and clamped again to then be, irrespective of the distortion problem, finish machined through, for example, hard milling. Thanks to the application of drills and taps specifically for hard machining the unclampin and re-clamping operation following the first machining cycle can be dispensed with - a considerable cost advantage for the production.

Hard drilling and tapping operations are also often required when holes and threads need to be produced in the workpiece after hardening because they have either been forgotten or were not intended but are suddenly required dur to modifications.

For thes particularly demanding operatios, Guhring can provide a variety of tools that, thanks to their especially optimised tool material, geometry as well as surface quality, satisfy these high requirements.

- Hard profile cutters, 2-fluted, Guhring no. 3359 and   3360
- Hard profile cutters, 4-fluted, Guhring no. 3361 and   3362
- Multi teeth end mills, Guhring no. 3363, 3715 and   3716
- Twist drills for hard machining, Guhring no. 1946
- Taps for ISO metric threads, Guhring no. 2944

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- the diameter tolerance must not exceed the   maximum of 0,005 mm (< IT7) with a hole to hole   repeatability of 0,002
  to 0,003 mm.
- the surface quality of the hole must be   approximately Ra 1,0 to 2,0 mm according to the   roughness classification
  N6/N7 in accordance to DIN 1302.
- the drill must possess a high positional accuracy.
- a long tool life of approximately 3000 holes in steel   of the hardness 47 HRC must be achieved.

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With the FL-drill, Guhring is providing the optimal tool to satisfy these requirements. Produced in grade DK460 UF ultra fine grain carbide and TiCN-coated, the FL-drill is process reliable whilst satisfying the highest demands.

However, a pre-requisite is the use of hydraulic chucks for the holding of tool and workpiece as well as the application of neat oil or a a minimum 30% soluble oil as coolant.

Under these application conditions the FL-drill can achieve a tool life of in excess of 6000 holes, whereby the cutting speed should be in the region of 36 to 38 m/min. A value of one percent of the nominal diameter should be chosen for the feed rate. Even in steels up to 60 HRC the FL-drill is already well proven.

A classical special tool, the FL-drill is produced by Guhring exactly according to costumer requirements. Shank and nominal diameter as well as total, shank and cutting edge length can be chosen as required. If not requested otherwise, the FL-drill is supplied with a point geometry comparable to Guhring's type RT 100 U Ratio drill. Point angles of 120° and 150° are available.

As one of the world's leading manufactureres of carbide, Guhring not only supplies the optimal drill for the machining of rock drilling heads but also the rockbits.

The Guhring TM vending machine is the centre point of the tool management. Thanks to the high quality design and the innovative software it provides 24 hour tool availability. In addition, it offers comprehensive evaluation possibilities regarding tool requirements.

- 24 hour controlled tool availability
- avoidance of production stoppages
- reduction in storage and administration costs
- continuous reporting of all tool movement data
- allocation of tool costs to the relative cost centres
- automatic order processing
- extendable modular draw and spiral system
- individual tool storage thanks to individual draw   dimensions
- administration of re-worked tools
- interfaces to external PPS or WWS systems
- raising employee awareness regarding tool cost
- secure tool storage

The operation of the TM vending machine is simplicity itself thanks to the intelligent and user friendly software. Personnel select the required tool via a touch-screen-monitor or a barcode scanner. Thanks to the internet connection, the tools are reordered online from the respective supplier.

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The shank end to suit minimal lubrication

Because an extremely low volume of lubricant is applied with minimal lubrication, the delivery of these low coolant quantities to the effective area is of utmost importance. Hereby, the geometric design of the shank end is of main significance for a safe delivery of the lubricant.
The Guhring developed tapered shank end optimally satisfies the relevant conditions for applying minimal lubrication:

• no lubricant pockets
• minimal dead area
• simple operation
• cost-effective production

A further, decisive criterion for the optimal functioning of minimal lubrication tools is a problem-free lubricant transfer in the chuck area. Guhring‘s solution is a one-piece delivery pipe with a glued-in carbon pipe.

In comparison to entirely dry machining, minimal lubrication can considerably reduce machining temperatures. The result is longer tool life and increased process reliability. Thermo-graphic experiments at Guhring showed that cooling with dry air reduces the temperature at the tool point by more than 200°. The adding of coolant, therefore minimal lubrication, resulted in an even lower temperature thanks to the reduced friction.

The helix angle influences swarf evacuation and the temperature

Experiments with high-speed and thermo-graphic cameras at Guhring show a clear connection between the helix angle and the temperature development with the application of minimal lubrication. Straight-fluted tools create considerably higher temperatures due to the increased chip deviation in comparison with tools, for example, with a 30° helix angle. Increasing the helix angle also improves the chip evacuation – an especially important aspect for the machining of deep holes with minimal lubrication.

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