Tapping
Chucks

The perfect synchronisation compensation in the Rubber-Flex-Clutch (RFC) ensures that the axial smoothness is fully decoupled from the torque load.

Tapping Chuck Facts

Sensitive response

→ Frictionless synchronisation compensation in four axes

Optimal cooling lubricant supply

→ The pressure of the coolant does not affect the synchronisation compensation

from… SYNCHRONISATION COMPENSATION IN 4 AXES

→ TENSILE AND TORSIONAL FROCES DURING THREAD CUTTING AND FORMING

The RFC acts on the radial drive in the direction of rotation as well as on the axial compensation in both tensile and compressive directions.

→ TORSIONAL AND COMPRESSIVE FORCES AFTER DIRECTION REVERSAL

The RFC acts on the radial drive in the opposite direction of rotation and on the axial compensation in both tensile and compressive directions.

to… PLAY-FREE SYNCHRONISATION COMPENSATION

The perfect interplay of the highly precise individual components ensures maximum concentricity. Special attention is given not only to the accuracy but also to the length of the guide rails.

In general, the longer moving parts are guided, the more stable the accuracy is maintained. CENTRO|P synchro thread tapping chucks stand out compared to other systems due to these extra-long guides while maintaining FAHRION’s high quality.

The more coolant that reaches the right place, the better the process

With a synchro chuck, the coolant cannot simply be fed through as with a standard chuck but must inevitably flow through several parts. This results in significant differences in the flow rates.
The optimised arrangement and the large cross-section of the channels in our CENTRO|P synchro clearly pay off here. With the MSC8 chuck body, we achieved 18 times the flow rate compared to the best competitor product with axial force-neutral internal cooling.

The synchro chucks from FAHRION achieve the highest flow rate of comparable chucks available on the market.

Gewindeschneidfutter

Additional highlight – precise and synchronised to the very end

The previously mentioned FAHRION-specific guide design ensures high concentricity even with long overhangs, right down to the smallest detail.
The Rubber-Flex-Clutch (RFC) provides the necessary damping properties in the axial and radial directions.
With a diameter of 10 mm, our Mini Synchro Chuck MSC8 is currently the slimmest system on the market (including the long-established FAHRION CENTRO|P technology).
It is unique in that the extended CENTRO|P synchro versions, despite their extremely slim outer contour, feature internal coolant supply.

ADDITIONALLY, YOU CAN ACHIEVE SIGNIFICANT COST SAVINGS:
→ You only need one FAHRION CENTRO|P synchro chuck in the desired extended version and a more affordable standard-length thread tap.
This eliminates the need for expensive long thread taps or corresponding thread cutting extensions.

The current product range can be found in our sales brochure ↗︎.

FAHRION tapping chuck concentricity graphic

Lubrication is very important in threading

Generally, lubrication in machining serves to minimise friction, extend tool life, improve surface finish, reduce workpiece deformation and ensure process stability.

This is a key factor in ensuring efficient and precise metal cutting. Cooling lubricant (CL) reduces friction in machining, which is particularly crucial in threading, as this type of machining generates significant frictional forces.

In addition, the removal of chips by the cooling lubricant is absolutely essential in blind hole threads.

Coolant Supply

FAHRION tapping chuck coolant comparison

Advantages of internal lubrication

It is crucial that the coolant reaches the cutting edge in sufficient quantities and at adequate pressure.

For many operations, it is advantageous for the coolant to be fed through the tool.

As illustrated in the diagrams (Top image: External coolant supply/Bottom image: Internal coolant supply), internal coolant ensures that sufficient coolant always reaches the cutting edge, even in complex contours, rather than being wasted.

If internal coolant supply is possible through the chuck body, the exit can occur either through the tool or through the collet.

Benefits

Good to know

The CENTRO|P of tapping chucks

Axial-force neutral coolant guidance

Cylindrical shank and its benefits

Does FAHRION have a thread tapping chuck that extends the life of my threading tools or improves a critical process?

Yes, the Rubber-Flex-Clutch (RFC) in the CENTRO|P synchro chucks is the only synchronisation technology on the market with torque transmission without mechanical components. As described earlier, the system maintains its high sensitivity, which leads to longer tool life and a more reliable process. Additionally, this design allows for long, slim constructions with internal coolant supply for threading in hard-to-reach areas.

Das CENTRO|P unter den Synchro­futter

Auch in unseren Synchrofutter haben wir natürlich unsere patentierte Spanntechnologie des CENTRO|P eingebaut. Diese glänzt durch die Vielzahl seiner Vorteile und leistet mit seiner zuverlässig hohen Präzision und Qualität einen erheblichen Beitrag zur effizienteren Bearbeitung und zur Senkung der Produktionskosten.
Dabei sind die wichtigsten Designmerkmale:
Spannzange sitzt komplett im Konus
Exakt geschliffene Doppelführung für die Spannmutter
Stabiles Trapezgewinde zur Übertragung der Spannkraft
Futterkörper mit durchgehend maximalem Durchmesser

Axialkraft neu­trale Führung des Kühl­schmier­stoffs

Der Kühlschmierstoff darf im Inneren des Futterkörpers keine Kraft auf den axialbeweglichen Teil des Synchrofutters ausüben. Weil ansonsten die Funktion des Systems bereits ohne externe Anregung im Einsatz der Schneide ausgelöst wird.

Deswegen haben wir uns bei FAHRION etwas Besonderes ausgedacht:
Die Kanäle zur Führung des Kühlschmierstoffs sind so ausgelegt, dass bis zu einem sehr hohen Kühlschmierstoff-Druck von bis zu 80 bar keine Auswirkungen auf das Ansprechverhalten des Synchronausgleichs hat. 
Das beweisen die Zahlen in unserem Versuch:

Diagramm 1
Kraftmessung beim Gewindeformen eines M6 Gewindes mit Synchrofutter bei ausgeschalteter interner Kühlschmierstoff-Zufuhr. 
Alle 3 Synchrofutter zeigen den typischen Kraftverlauf beim Formen eines Gewindes. Dabei sind die auftretenden Kräfte beim CENTRO|P synchro am geringsten.

Diagramm 2
Kraftmessung beim Gewindeformen eines M6 Gewindes mit Synchrofutter bei eingeschalteter interner Kühlschmierstoff-Zufuhr.
Speziell bei einem der beiden Wettbewerber weicht der Kurvenverlauf signifikant vom Verlauf im linken Diagramm ab (grüne Linie). In diesem Fall ist die Funktion des Synchronausgleichs und damit ein sicherer Prozess nicht mehr gewährleistet.

Im Gegensatz hierzu ist das CENTRO|P synchro (blaue Linie) mit einer Axialkraft neutralen Innenkühlung ausgestattet. Der Kurvenverlauf ist vergleichbar mit dem Verlauf im linken Diagramm und zeigt somit keinen Einfluss des KSS-Drucks.
Kurz zusammengefasst:

Info
Ohne Axialkraft neutrale Kühlung gilt: je höher der Druck desto schlechter die Synchronisation.
Zusätzlicher Vorteil
Durch die Axialkraft neutrale Führung der KSS-Kanäle im CENTRO|P synchro sind Funktionalität und Sensitivität der Rubber-Flex-Clutch auch bei hohem KSS-Druck optimal.

Zy­linder­schaft für unterschiedliche Schnittstellen

Speziell die Ausführungen mit Zylinderschaft können über ein entsprechendes Spannfutter, zum Beispiel das CENTRO|P, auf unterschiedlichsten Maschinen-Schnittstellen eingesetzt werden.

Dies ist eine sehr flexible Lösung, wenn ein Synchronfutter auf mehreren Maschinen eingesetzt werden soll oder für weniger gängige Schnittstellen, für die es bei den Synchrofuttern kein Standard-Programm gibt.

Die aktuelle Produkt-Übersicht finden Sie in unserer Verkaufsbroschüre ↗︎.

The CENTRO|P of tapping chucks

Of course, our patented CENTRO|P clamping technology is also incorporated into our synchro chucks. This excels with its many advantages and makes a significant contribution to more efficient machining and cost reduction with consistently high precision and quality.
The most important design features are:
The collet sits completely inside the cone
Precisely ground dual guide for the collet nut
A stable trapezoidal thread for transferring of the clamping force
A chuck body with continuous maximum diameter

Axial-force neutral coolant guidance

The coolant must not exert any force on the axially moving part of the synchro chuck within the chuck body. Otherwise, the system would already be activated without external stimulation when the cutting edge is engaged.

That’s why FAHRION came up with something special:
The coolant channels are designed so that even at high coolant pressures of up to 80 bar, the synchronisation compensation’s response is unaffected. 
This is demonstrated by the data from our tests:

Diagram 1
Force measurement when thread forming an M6 thread with a synchro chuck with the internal cooling lubricant supply switched off.All 3 synchro chucks show the typical force curve when forming a thread. The forces experienced by the CENTRO|P synchro are the lowest.

Diagram 2

Force measurement during thread forming of an M6 thread with synchro chuck with internal cooling lubricant supply switched on.
For one of the two competitors in particular, the curve deviates significantly from the curve in the left-hand diagram (green line).In this case, the function of the synchronised compensation and therefore a reliable process is no longer guaranteed.

In contrast, the CENTRO|P synchro (blue line) is equipped with an axial-force neutral internal cooling system. The curve is comparable to the curve in the diagram on the left and therefore shows no influence of the cooling lubricant pressure.
In summary:

Info
Without axial-force neutral cooling, the higher the pressure, the worse the synchronisation.
ADDITIONAL ADVANTAGE
Thanks to the axial force-neutral guidance of the coolant channels in the CENTRO|P synchro, the functionality and sensitivity of the Rubber-Flex-Clutch (RFC) are optimised even at high coolant pressure.

Cylindrical shank for various interfaces

Especially the versions with a cylindrical shank can be used on different machine interfaces with a suitable clamping chuck, such as CENTRO|P.

This is a highly flexible solution when a synchro chuck needs to be used on multiple machines or for less common interfaces that don’t have a standard synchro chuck program.

The current product range can be found in our sales brochure ↗︎ .