• GT-Lehrdorn
  • Kreissegmentfraeser
  • PunchTap
  • Speedsynchro-Modular
  • Tandemkegel
  • Cut&Form
  • EF-Hauptsitz

Internal coolant-lubricant supply (IKZ)

If a machine tool is equipped with internal coolant-lubricant supply through the machine spindle, then the thread production cycle can be done with special economic efficiency by conducting the coolant-lubricant through the axial bore in the tool, or along the tool shank.

The advantages of this arrangement are:

  • perfect lubrication at the cutting edge of the tool
  • improved thread quality
  • chips are washed out of the thread hole

It is, however, necessary to make sure that the coolant-lubricant used is appropriately filtered and that the tap holder used is suitable for the coolant-lubricant pressure of the machine. Depending on the design of the tool, with or without internal coolant-lubricant supply, the quick-change adapters are available in two versions:

Conduction of internal coolant-lubricant supply
with tools with IKZ:


Conduction of internal coolant-lubricant supply
with tools without IKZ:

Minimum-quantity lubrication (MQL)

Suitable for machines which are equipped with a central minimum-quantity lubrication system – this is often called “dry machining”. In addition to the advantages described under “IKZ” this new lubrication technology is very friendly to the environment. The high cutting data common in wet machining can be used without any change.
Another advantage is the reduction of costs, since there is no need to purchase and maintain expensive filter installations, or to dispose of used emulsions.

For more detailed information, see Minimum-quantity lubrication (MQL)

Coolant-lubricant pressure…

…at the entry to the holder

For the sake of trouble-free operation of the tool holders, it is vital not to exceed the specified maximum coolant-lubricant pressures.

Length compensation on compression and tension

Length compensation on compression
This type of length compensation compensates differences between spindle feed and the pitch of the thread to be produced. If a quick-change adapter with overload clutch is used, the length compensation on compression accommodates spindle feed as soon as the overload clutch responds.

Activated length compensation on compression at:

  • plus programming of the control
  • overload on the quick-change adapter with overload clutch

Length compensation on tension
This type of length compensation compensates differences between spindle feed and the pitch of the thread to be produced, as well as a spindle overrun at the point of reversal of the thread production cycle.
With the tapping attachments, the length compensation on tension assumes the function of switching the sense of rotation from right-hand to left-hand rotation.

Activated length compensation on tension at:

  • minus programming of the control
  • manual retraction


Minimal length compensation

An integrated minimal length compensation on compression and tension compensates minimal pitch differences between synchronous spindle and tool which would lead to excessive friction forces on the thread flanks. A possible increase of axial force during the thread production cycle is reduced to a minimum.

The resulting advantages are:

  • no miscut threads
  • optimised tool life
  • suitable for internal coolant-lubricant supply

For more detailed information, see Rigid Tapping.

Pressure-point mechanism

The patented pressure-point mechanism guarantees a safe start of the thread cutting process. The length compensation movement is released by the pressure-point mechanism only when the effective axial force exceeds the normal, permissible start-of-cut force. This helps to achieve reproducible, uniform thread depths.

Front release

The front release protects the quick-change holder, the quick-change adapter and the tool, as well as the workpiece, against damage caused by excessive axial tension. Such tension may occur if the length compensation path is exceeded due to afterrunning of the spindle at the point of reversal, or when the fast-feed function of the tool retraction movement is activated before the tool has come free from the workpiece. In these situations, the quick-change adapter is detached from the holder automatically, avoiding expensive damage.

Situation before the triggering of the front release

Situation after the triggering of the front release

Axial-parallel floating

A ball-based floating system guarantees that small errors of alignment between machine spindle and thread hole, or concentricity run-out on the side of the machine spindle, are compensated.

Two parallel drilled holes, offset by 90°, form a precise ball-based linear guide. This arrangement is the perfect solution for the function of the “parallel floating” feature.


Overload clutch

The wave-line profile overload clutch as developed by EMUGE is characterised by its great wear resistance. Grease chambers between the upper and lower clutch ring provide permanent lubrication during the overload process. When the set torque is exceeded during a threading process, the overload clutch immediately interrupts the torque transfer between machine spindle and tool. This protects the tap against damage.

Reverse gear

The integrated reverse gear makes a change of the sense of rotation of the machine spindle for reversing superfluous.

The resulting advantages are:

  • time savings due to reduced cycle times
  • reduced stress on the machine spindle due to constant right-hand rotation
  • energy savings due to nearly constant power consumption

Drilling and countersinking

Drilling and countersinking operations can be done without exchanging the quick-change holder, simply by blocking the length compensation with a locking screw.

The resulting advantages are:

  • alignment offset between drilled hole and thread reduced to a minimum
  • no time-consuming re-tooling, with according cost reduction

Tool adaptation…

…by means of quick-change adapters, EM series

The quick-change adapters of our EM series have been designed for use in the quick-change tap holders of our KSN and SFM series. The five sizes have been divided into corresponding thread size ranges, and are available in different types. The adaptation of the tool is made by means of a quick-change ball clamping system in most quick-change adapters, with a separate adapter being necessary for each shank diameter. Our quick-change adapters are suitable for the production of right-hand and left-hand threads.

Tool adaptation…

…by means of quick-change adapters, HE series

The tool adaptation is effected by means of quick-change adapters of our HE series. The clamping of the tool is provided by threaded pins.
For our adapters type HE 2/IKZZ, we recommend a fastening torque of 15 Nm.

Tool adaptation…

…by means of collets, type ER (GB)

The tool adaptation is effected by means of collets of our ER, or our ER-GB series (with integrated square) acc. DIN ISO 15488 (formerly DIN 6499). This type of clamping helps to achieve very good concentricity and a safe clamping of the tool, especially with high cutting speeds and coolant-lubricant pressures.

Tool adaptation…

…by means of collets, type PGR-GB

The tool adaptation is effected by means of collets of type PGR-GB (with integrated square).

Tool adaptation…

…by means of collets, type Rubber-Flex

The tool adaptation is effected by means of Rubber-Flex collets. These are rubber collets with steel segments integrated by means of vulcanisation.

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EF-Workshops 2019
Ausbildung & Karriere
Für den Ausbildungsbeginn September 2020 bitten wir um Bewerbung mit den entsprechenden Zeugnissen bis zum 30.09.2019

Die Ausbildungsplätze 2019 sind sowohl für den kaufmännischen Bereich als auch für den gewerblich-technischen Bereich besetzt.