Machine The Shaft Without Hiding The Shaft

What if the surface you need to turn is the same surface a conventional chuck wants to grip? Röhm face drivers & accessories transfer torque through the end face of suitable rotationally symmetrical workpieces, allowing shafts & cylindrical components to be supported between centres while leaving the outside length accessible for machining.

Pair the driving end with Röhm | Centres & Accessories when planning between-centres support, or explore Röhm | Workholding & Clamping when comparing face driving with other Röhm workholding methods.

What Are Röhm Face Drivers & Accessories?

Instead of wrapping chuck jaws around the outside diameter, a face driver approaches the job from the end.

The centre locates the workpiece while the driving disc engages its end face. With suitable tailstock support applying axial force, the face driver transfers spindle torque into the component while leaving the outside diameter available to the cutting tool.

This arrangement is particularly useful for shafts, stepped components & other rotationally symmetrical parts where substantial external surfaces need to remain accessible.

Röhm's CoAE system uses a modular arrangement with replaceable centres plus driving discs. This allows the face-driver body to be configured around different suitable workpiece geometries without treating the complete assembly as a single fixed combination.

The wider Röhm face-driver family includes CoA, CoE plus power-operated CoK configurations, giving machine shops different approaches for particular workpiece, machine plus production requirements.

Why Choose Röhm Face Drivers?

The advantage becomes clear when the chucking surface is also the machining surface.

Driving through the workpiece face can leave the outside diameter accessible across much more of its length. This is valuable when machining shafts with several external diameters, shoulders or surfaces that would otherwise be interrupted by conventional jaw clamping.

Applicable CoAE arrangements can also support turning plus milling while the workpiece remains in the same suitable clamping setup. Keeping the component located between centres can reduce unnecessary repositioning between compatible operations.

End-face condition matters too. CoAE uses hydraulic pressure compensation across its driving arrangement, helping maintain the required driving contact where suitable workpiece faces are not perfectly square.

Applicable CoAE configurations can operate clockwise or counter-clockwise when fitted with the corresponding driving components. That makes driving-disc selection an important part of setting up the system rather than an accessory decision made afterwards.

There are still plenty of jobs where outside-diameter chucking is the right solution. For those applications, compare Röhm | Power Chucks rather than trying to make face driving suit the wrong workpiece.

Common Applications

Transmission shafts are a natural candidate because long external sections may require machining while the component remains located between centres.

Motor shafts can present a similar challenge, with the cutting tool requiring access along the component while torque still needs to be transferred reliably.

Stepped shafts demonstrate one of the clearest advantages of face driving. Several external diameters can potentially be approached without moving chuck jaws from one gripping diameter to another.

Axles plus cylindrical blanks may suit between-centres machining where the component provides an appropriate centre feature plus suitable driving face.

Turning followed by milling is another useful application for applicable CoAE setups, particularly where retaining the component in one suitable clamping arrangement simplifies the machining sequence.

Components with important outside surfaces can also warrant investigation when conventional external gripping would occupy or mark an area required later in the process.

Repeated shaft production can benefit where reducing unnecessary reclamping helps simplify the sequence from one component to the next.

Long workpieces still need to be considered as complete setups. Face driving provides the driving connection, but workpiece length, mass, tailstock support plus any additional support requirements must all be considered before machining begins.

Product Selection Guide

Choosing a face driver starts with the workpiece end face, not simply its maximum outside diameter.

First, establish the available driving area. The driving disc needs an appropriate face through which torque can be transferred.

Next, inspect the centre feature. The selected centre point must correspond with the workpiece rather than being chosen simply because it fits the face-driver body.

Workpiece length plus mass should then be considered alongside the available tailstock arrangement. The complete setup needs to locate, support plus drive the component appropriately for the intended operation.

Machine mounting is another key distinction. Röhm face-driver configurations can use different mounting arrangements, so the machine-side connection must be established before selecting the assembly.

Finally, match the driving disc to the component plus intended rotational direction. Driving-circle diameter, contact arrangement plus workpiece conditions all matter.

Build The Face-Driving Setup From Both Ends

For modular CoAE equipment, keep the relationship between the body, driving disc plus centre clearly documented when ordering replacement components.

Expert Tips

Look at the end face before measuring the shaft diameter. The face driver needs suitable contact through which torque can enter the component.

Check rotation before selecting a driving disc. Do not assume a disc used for one machining direction is automatically correct when rotation changes.

Inspect the centre feature separately from the driving face. One transfers torque while the other establishes location. Both need to suit the workpiece.

Treat tailstock loading as part of the complete arrangement. The tailstock does more than support the free end; axial force forms an important part of the face-driving setup.

Keep interchangeable components identified. Centres, driving discs plus smaller service parts are much easier to manage when they remain associated with the correct face-driver body or recurring job.

Inspect the engagement after the initial setup. Checking how the driving elements contact the workpiece face before a full machining cycle can reveal setup issues early.

Plan the next operation before releasing the component. If suitable turning plus milling can remain within one clamping arrangement, consider the entire machining sequence before disturbing the setup.

For shaft, centre plus setup measurements, Measuring & Layout Tools can support the wider machining process.

Interchangeable centres, driving components plus smaller face-driver parts also benefit from controlled storage. Foam Tool Inserts can help keep dedicated components separated plus identifiable between jobs.

Experience around workholding often shows up in decisions made before the spindle starts. Whispers & Wisdom: We Are Losing the Art of the Master Tradesperson looks at the value of retaining that practical workshop knowledge.