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A technology concentrate !


NEWEN® CONTOUR-BB™ :  2-Axis Single Point CNC Valve Seat & Guide Machine.


                          - Max X-Axis Travel                                            760mm (29.92”)

                          - Max Y-Axis Travel                                            60mm (2.36”)

                          - Max Z-Axis Travel                                            250mm (9.84”)

                 CYLINDER HEAD DIMENSIONS      

                          - Maximum height (w/o removing pilot)           315mm (12.40”)

                          - Maximum length                                              unlimited

                          - Maximum width                                               Approx. 450mm (17.72”)





Like the principle of a CNC lathe, FIXED-TURNING ® is the machining of valve seats and/or any revolution shape by interpolation of axes.

Aside from the fact that it is the cutting tool that is spinning and not the part being machined itself, the machine spindle and machining head allow to very simply machine the most difficult and most complex shapes regardless of the quality of the valve seat material. While rotating, the cutting tool moves on its x and z axes to describe the profile to machine. The machining is performed in one direction and the number of passes is automatically defined by the program itself. The travel of the cutting tool is optimized according to the actual shape of the raw valve seat. A standard triangular cutter moves according to the axis of the carriage and the axis of displacement of the spindle. The whole rotates around the C-axis.

A powerful computer permanently calculates the optimal trajectory of the tool so that the cutting efforts are regular and reduced to a minimum. Every single shaving calculated from a fraction of a second to a fraction of a second is produced in such way that no fluctuation of the cutting efforts disrupts the balance and the flexibility of the spindle.

Thanks to FIXED-TURNING ®, perfect valve seat machining and a perfect seal between the valve seat and its valve are attained each and every time, the first time, without lapping.

Modern controls, latest technology, efficient, simple, extremely user friendly, relieves the operator of repetitive gestures, reduces fatigue and frees up attention for essential operations.

The interaction with the machine is user friendly and simple. The operator only needs to enter familiar dimensions such as the diameter of the valve, select a profile and the machine will instantaneously calculate everything else, including all roughing and finishing machining passes.

Beyond precision, beyond mere user friendliness and added productivity, FIXED-TURNING® is the equivalent of thousands of custom form tools, all permanently packaged in one simple and affordable machine.

Long Live Engine Rebuilding.

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Control Panel fitted with push-buttons and protected by interchangeable lexan, multifunctional electronic wheel. Precision. Reliability.

The spindle is built-in the machine head moving on the x,y axis owing to an air cushion.  Automatic centering with programmable temporization.  Automatic re-centering of the spindle with pneumatic jacks.


FIXED-TURNING® numerically controlled axes driven by satellite roller screws and servo-motors of the latest generation.  A precision of the tool travelling by Interpolation is measured in thousands of mm.

Machine head, pressurized by constant air flow for protection of all the precision mechanical components against metallic operating dusts.

15" fanless industrial PC of the latest generation, IP65, 64 bit operating system, Windows 11, with built-in flat touch screen.  A user friendly and intuitive dialogue between the machine and the operator. Unlimited memory capapacity.

NEWEN FIXED-TURNING machining  head featuring patented friction free, pinion free and maintenance free kinematics, capable of machining with the highest degree of precision, year after year.  Pilot centered and held by an original and efficient hydraulic crush sleeve system.

Z-axis (250mm/9.84") mounted on linear ways authorizing any cylinder head position while guarantying systematic balancing of the spindle.  Increased work capacity and increased machining precision.  A NEWEN exclusive.

Solid honeycomb-design machine upper-ways confers stability, logevity and precision to the machine.

Electronic and electric components interconnected with quick plugs.  Electronics entirely protected with stand alone suspended shock proof cabinet.  Electronics conceived and produced by NEWEN.

Machining spindle mounted on special high precision bearing, greased for life.  Powerful transmission via machined high preicsion spiral beval pinion set.

NCS200M, palletizable, 360 degree double-angle manual rollover clamping fixture.  Allows quick positioning of most cylinder heads regardless of the valve guide angles.  Also allows to simply raise cylinder heads to any desired level and to roll them over for various jobs.  This patented

system is quick, universal, very rigid,

user friendly and does not put any

stress on cylinder heads owing to its

independant jaws and spherical collet

clamping system.

Machine parallels mounted on linear ways, greased for life, entirely protected.  Simple, fast and efficient mechanical lock to ensure effortless positioning of any cylinder head.

Stress relieved welded frame coated with industrial resin, resistant to any chemical agent (High frequency stabilization during welding).


NEWEN® CONTOUR-BB™ : 2-Axis Single Point CNC Valve Seat & Guide Machine.



X-Axis, machine head travel,

longitudinal head travel (distance from guide                                   760mm (29.92”)

to guide - X)

Y-Axis, machine head travel                                                                 60mm (2.36”)

Y’-Axis, machine parallels travel,                                                         200mm (7.87”)

mounted on linear ways

Z-Axis, machine head travel (vertical travel),                                       250mm (9.84”)

mounted on linear ways

Z’-Axis, spindle sheath travel (for                                                         80mm (3.15”)

machining purposes only)

X-Axis, carriage travel, automatic carriage                                          11mm (.43”)

displacement radius 22 mm in diameter

(ex : if tool set with a diameter of 20 mm, max machining dia

without repositoning p holder 42mm)  Machining capacity               13.5mm - 100+mm

(.53” - 3.94+”)

Valve guide reaming capacity                                                               65mm (2.56”)

Possible Profiles                                                                                     unlimited

Material to be machined                                                                       Any material, from aluminum to tempered steels

Spindle rotation speed 300-2500 Rpm

Spindle motor 1.5 HP

Spindle, Feed and Carriage motors                                                    Servo Motors

Hydraulic unit                                                                                         200 Bars (2,900psi)

PC                                                                                                           15 ‘‘Industrial type with

touch screen

Connections                                                                                          RS232 – Ethernet

Centronics – USB

Operating System                                                                                 Windows 11

Electronic suspended cabinet with interchangeable fi lter

Built-in low-voltage multipoint lighting (LEDs)

Electronic depth gauge LVDT

Numerical control                                                                                 NEWEN®

Software                                                                                                 NEWEN®


Maximum height (w/o removing pilot)                                                315mm (12.40”)

Maximum length                                                                                   unlimited

Maximum width                                                                                     Approx. 450mm (17.72”)


Maximum machine height                                                                    2205mm (86.81”)

Maximum machine width                                                                     1460mm (57.48”)

Maximum machine depth                                                                     1327mm (52.24”)

Machine net weight                                                                               800 Kg (1764 Lbs)

Machine gross weight                                                                           980 Kg (2160 Lbs)

Voltage                                                                                                   220V Single Phase,

50-60 Hz

Air Pressure Mini 6 bars, 90 Psi


Height 2090 mm

Depth 1380 mm

Length 1390 mm

New possibilities


Machining the most difficult cylinder heads is achieved within mere minutes per valve seat for the longest profiles, specially made to enhance the output of the engine. The machining of a traditional “3-Angle” profile will be carried out within a few seconds.

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Motorcycle cylinder heads, the smallest valve seats around and to come (downsizing, at the heart of all the new engine development programs) can be machined with utmost ease and the optimum precision of competion engines...

NEWEN® machines allow each engine rebuilder to position himself as a specialist in the machining of all engine types. The precision that is achieved systematically when using FIXED-TURNING® machines applies to all the engine types, one no longer has to refuse getting involved in such or such machining on such or such cylinder head type, all the difficult machining operations become a source of additional and significant profits.


The high performance market, the mechanical leisure market, are within the reach of any engine rebuilder equipped with a FIXED-TURNING® machine.

All the precisions required in Formula 1 or any other demanding high performance mechanical sports can be attained automatically and systematically. Perfection is guaranteed.

High-Performance is a growing and lucrative market. The prestige of the high-level professional who gets involved in this specialty shines on his/her entire company.

The COGENERATION, also known as “Combined Heat and Power (CHP)”, the transformation of engines to natural gas and bio-fuels (ethanol) requires rapid and precise machining operations of valve seat counter-bores and very hard valve seats.

The principles of cogeneration have long been known and put to use in a wide variety of applications. Today, advances in ultra-clean natural gas fi red reciprocating engine technology, heat exchangers and system controls, make cogeneration both practical and economical for applications in varying size range.

One aspect of power production that has influenced these advances is the ever increasing need for cleaner energy. Emissions control strategies that allow natural gas fueled internal combustion engines to be applied for CHP & ICHM applications at levels equal to or less than current large power plant standards, have further made Cogeneration more practical, economic and accessible for a broader range of commerical and industrial applications.

FIXED-TURNING® is the ideal tool for these services which become easy, fast, precise and very profitable.

FIXED-TURNING® and its numerical control,

it is the possibility to achieve the impossible in a profitable

and repetitive fashiong.  A technology for all.

Opt for FIXED-TURNING® Perfection,

a technology for all and gain access to endless business opportunities...
Your assurance of success!

To machine all the cam-bucket bore housings to oversize dimension in order to insert oversized sleeves in the housings is a simpe operation, precise and profitable with FIXED-TURNING®.

Create OFFSET profiles at will...

Machining of venturis (up to 112 degrees) to accelerate the speed of gases.

Venturi: An open angle below the seat that allows to accelerate the speed of exhaust gases through decompression.

Machine all high precision valve seat counterbores with one same cutting tool.  To prepare valve seat housings in all types of cylinder heads, cast iron or aluminum, a precise and profitable job for all the FIXED-TURNING® professionals.


KOMATSU Natural Gas Cylinder Head
Valve Seat Hardness: 56/58HRC
(573HB+ / 610HV50+)
- Insert used: FT-11-11
- Cutting Speed: 180 m/min
- Machining Mode: Dry Cut
- Cutting Cycle: 28 sec/seat
- Circularity : 1μ to 2.40μ
- Surface Finish: 0.20Ra

Another NEWEN exclusive: the machining of Spark Plug Housing.

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Machine with precision all types of valve guides (cast irons, powdered metals, bronze, any alloys...).  Ream valve guides with utmost precision in a stand alone operation or in a combined valve seat machining operation.

To machine the seats of Mercedes Actros decompressor valves, “it’s child’s play”.

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Automatic Repetive Depth Control (ARDC)


All NEWEN FIXED-TURNING® machines, including the CONTOUR-BB™, CONTOUR-BB-CS™, CONTOUR™, CONTOUR-CS™, EPOC-VISION™, are equipped with an electronic system to repeat the depth of cut with preci-sion. This system, developed by NEWEN, is not a measuring system per se but has been conceived to allow to repeat a machining position with precision, while taking a random reference on the cylinder head to  machine. Generally, the reference for the NEWEN system is the cylinder head gasket plan, which is also used as a reference to measure valve seat depth. It is also possible, using a specific tooling, to use other surfaces, such as camshaft housings.


An electronic linear gauge, LVDT, (I) is connected to the numerical control of the machine. Depending upon the collapsed epth of the tip of the LVDT, the gauge sends an electric signal which allows to identify, with less than one hundredth of a mm, the position of the gauge.

This position can be memorized. Once the position memorized, the spindle feed motor is automatically stopped when the gauge is once again compressed the same amount. As a result, the equipment can machine all the valve seats at the same depth with respect to a chosen reference point.

• The gauge (I) has a fi xed position with respect to the axis of the pilot and with respect to the spindle sheath to which it is attached. This fi xed position remains when the spindle moves on its air cushion (C) and/or on its spherical air cushion (A).

• Drawing 3: All the seats are machined according to the same reference point (W), belonging to the reference plan and distant of a fixed measure (X), which is the same as the measure (X) in Drawing 1.

• The dimension (Z) on Drawing 2, is the amount of the gauge that is compressed and corresponds to a machining distant of the value (Y) on
Drawing 2 in comparison to the point of reference. This value (Y) can be modifi ed of a given and precise value using the controlled means of the numerical control (elevator, selection of repair dimensions...) which will modify the position of the tip of the gauge, and this latter will once more be memorized to be repeated as many times as desired.

• The collapsed amount (Z) of the gauge is not identical to the travel value of the spindle essentially because of the existing angle between the machine spindle and the gauge. Also, the LVDT is not a measuring instrument but a position indicator.


The NEWEN system for Automatic Repetitive Depth Control™, guarantees identical depth machining with variations not exceeding +/- one hundredth of a mm.


It is the only system available in the industry to guaranty an automatic machining of such precision, no matter the position of the cylinder head with respect to the cylinder head holding fi xture, with respect to the angle of the valve guides and with respect to the travel of the head of the machine.

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