The highly productive S-series of cnc cylindrical internal and external grinding machines offer a wide range of options, fast setting-up and high precision.

Grinding Technology for Tool Production The highly productiveS31cnc cylindrical internal and external grinding machine has awheelhead with two external grinding wheels for rough and finishgrinding left/left. Range of applications includes any type ofcylindrical internal and external machining for automaticproduction of individual components and series. The modularmachine structures, the modern control and programming technique,as well as the grinding technologies, guarantee a highproductivity and excellent machining quality.

The S31cnc isavailable with a distance between centres of 650/1000mm and acentre height of 175mm.

The machine has now been completed withan additional wheelhead version.

This allows the installation oftwo motor spindles.

Consequently, two diagonally installedgrinding wheels, with diameters up to 500mm, can be used.

Thanksto the independently programmable drives, these wheels can beadapted optimally for the respective grinding task, guaranteeinga large speed and perfor- mance range.

The B-axis swivelsautomatically with a resolution of 0.0001deg so that even thesmallest taper angles can be processed with cylindrical grindingwheels to extreme accuracy.

The Studer S32cnc is a fast, accurateand reliable external, cylindrical CNC grinding machine.

TheS32cnc has chameleon-like properties.

Thanks to the large varietyof extensions and versions, a large number of applications can becarried out on this machine according to customers requirements.This is possible thanks to X-axis versions at 0deg or 30deg, andthe possibility of positioning the grinding wheel on the left orthe right side.

Thanks to the versatile machine concept, thismachine permits a selection of the most suitable grinding method,according to individual customer requirements.

This means thatthe machine can master simple and complex tasks in a very highquality.

In the standard version, with the grinding wheel on theright side and a distance between centres of 400mm, this machineis perfectly suited for grinding small and average-sizedworkpieces.

In conjunction with the diamond roll dressingattachment, the S32cnc becomes a highly productive machine.

Ofcourse, thanks to the proven Studer concept it can be automatedeasily.

The use of our C axis turns the S32cnc into a high-powerplunge grinder.

In this context, the hydrostatic guideways of theX axis play an important role as they allow extremely rapid axestraversing with a minimum of axis lag.

Due to the new materialsthat are emerging in the market, the machining process has to beadapted to the situation.

The S32cnc can also master this problemas it can be equipped for high-speed grinding.

With a cuttingspeed of more than 125m/sec, even materials difficult to machine,such as zirconium ceramics or tungsten carbide, can be processedeconomically.

The Studer S40cnc is a highly productive universalinternal and external cylindrical grinding machine.

Its range ofapplications includes any type of external and internalcylindrical grinding task for the automatic production of one-offand series production.

The modular machine structures, the moderncontrol and the programming technique as well as the most recentgrinding technology guarantee a high productivity and machiningquality.

The S40cnc is available with distances between centresof 1000 or 1600mm and centre heights between 125 and 225mm.Wheelheads and workheads for practically any type of use areavailable.

The B-axes is oriented automatically with a resolutionof 0.0001deg so that even the smallest taper angle can be groundto the utmost accuracy with, straight grinding wheels.

We showthe universality of the machine on a complex chuck element.Grinding of forms and threads is always one element of completemachining.

The position and speed-controlled C-axis renders thesegrinding procedures possible.

A measuring system installed on themotor axis of the workhead or on the work spindle providesmaximum form accuracy of the form during the grinding process.Acceleration and grinding forces are easily absorbed by thedynamic rigidity of the axes drives.

With regard to threadgrinding parallel to the axes, the grinding wheel is notswivelled to the pitch angle of the thread, but it remains in thevertical position so that its angle of rotation remains parallelto the Z-axis.

Consequently, while grinding the thread there willbe a distortion of the profile which is compensated by the Studersoftware StuderThreadCNC to a negligible deviation.

Bycalculating the profile distortion and the automatic generationor optimised dressing programmes, thread grinding becomes nearlyas simple as plunge grinding or traverse grinding.

The StuderS60cnc is designed for the grinding of tool holders with theuniversal and production external cylindrical grinding machine.Progress can be obtained by force.

One is tempted to say thiswhen watching the Studer S60cnc in operation.

In order to fulfilthe increasing requirements of the tools, the quality of the toolholding fixtures has to be improved continuously.

The very bestquality of the workpiece is obtained if it can be processed inone single clamping and in one machining pass.

The Studer S60cncpermits complete grinding of tool holders up to the dimensionISO50.

By complete grinding we mean: the V-groove, the externaldiameter, the taper and, if required, the shoulder of the taperin one plunge cut.

Work is carried out by means of a profiledgrinding wheel.

The S60cnc with its elements entirely laid-outfor the production, for instance the grinding wheel width of upto 160mm and the grinding wheel diameter of 750mm, is perfectlysuitable for this type of application and therefore providesexcellent grinding results.

With this procedure, a tool holderISO 50, for instance, is manufactured to quality class AT-3 injust less than 90 seconds.

For this machine, the quality classAT-1 is no problem any longer.

In fact, it is a standardmachining task in a second clamping combined with in-processgauging.

The installation of two programmable surface grinders has allowed toolmaker Tarpey-Harris to reduce lead times by up to 25% and optimise grinding times for dies, moulds and precise parts.

The installation of two Okamoto ACC 450 DXA surface grindingmachines by 600 Centre of Shepshed, Loughborough has allowed theBelper-based toolmaker Tarpey-Harris to reduce lead times by upto 25 per cent, have one operator to look after both machines formost of the day and optimise grinding times for a wide range ofdies, moulds and precision parts. In addition, the company hasfound the Okamoto machines very easy to operate and to make itspurchase justification more significant, the final machinespecification worked out 20 per cent less than comparable surfacegrinders on the UK market. Established in 1969 as precisionengineers and toolmakers specialising in tooling for theinvestment casting industry, Tarpey-Harris is now part of theFairbrook Group.

The 32-strong Derbyshire company producesextrusion dies, injection mould tools, rubber mould tools and waxpattern dies that are mainly used for plastics window elementsand profiles as well as cladding for buildings.

The wax andrubber tooling it produces is primarily used in the manufactureof seals for hatches, doors and other openings for the aerospaceindustry.

However, the company also manufactures injection mouldtooling for a range of medical products and provides a componentmachining subcontract service for an array of different industrysectors.

With over 80 per cent of its machining work involvingtool production, grinding is therefore a key process.

So when thecompany decided to replace a couple of ageing manual surfacegrinders it looked around for the most suitable machine on themarket in terms of performance, accuracy, ease of use andespecially set-up and cost effectiveness.

As works director TonyHarris explained: 'After seeing an Okamoto 450 DXA in actionat a 600 Centre customer, we decided that this machine was idealfor our needs, combining precision with affordability.

Sinceinstallation the repeatability, ease of operation and minimalmanning requirements of the machines has transformed ourbusiness.

I look out of my office window and they are runningthroughout the day with hardly anybody ever near them.' Some90 per cent of the company's surface grinding work is nowchannelled through the Okamotos for processing a wide range ofdie parts, bolsters, die blocks, top plates, ceramic core diesplus a range of blank strips for components which aresubsequently profiled by wire-cut EDM.

Work can range fromgrinding the ends of 3 mm by 5 mm probes right up to quite largebolster elements, measuring 350 mm by 400 mm.

Although the tableof the Okamoto ACC 450 DXA is hydraulically actuated, the machineincludes a fully automatic grinding cycle controlled viamicroprocessor with digital readout (DRO) in two axes.

'Thisprovides us with maximum flexibility in terms of just how themachines can be operated,' maintains Tony Harris.

Each ofthe Okamoto grinding cycles tend to be split between variousmodes of operation for which a quarter accounts for manual andsemi-automatic cycles but fully automatic operation is nowapplied to half the work flow passing though the machine.Depending on the mix of work, one man can look after the twomachines for most of the time and in a typical working day, theoperator is only present at the machine for as little as 12 percent of the time which includes wheel dressing, outlines TonyHarris.

He maintains: 'This means we get 16 hours worth ofproduction from the two machines each day with an operator inputof around two hours.' However, he says: 'The biggestsingle saving has been the ability to measure components directlyon the machine using its integral, two-axis DRO.

Here thecontribution to productivity is much higher because parts do nothave to be removed from the table to perform key measuring tasksand we reckon this reduces our lead times by some 20 per cent.While the Okamoto's automatic operation, using auto downfeedand crossfeed has proved of major benefit to the company, thisfeature was not high on the list of priorities when the machinewas initially selected.

As Tony Harris recalled: 'Comingfrom purely 'hands on' manual machines, we were not toofussed about automatic cycles.

However, now that we have such aneasy to use facility, we are making more and more use of autocycling on specific types of work because it is dramaticallyincreasing the flexibility of labour.

Combined with quick set-uproutines, the Okamoto machines have proved to be a really soundinvestment and their repeatability is first class.' Equippedwith 450mm by 150mm magnetic chucks, the Okamoto machines areused on a wide range of tooling work - much of it involvinghardened steel elements.

Typical metal removal rates on hardeneddie blocks, for example, is about 0.5mm and tolerances as tightas two microns are regularly achieved.

Maintains Tony Harris:'Surface finish is another important consideration,particularly on mould type work, and the machines regularlyproduce finishes to 0.05 micron Ra.' The installation of thetwo Okamoto machines has made a big impact on surface grindingefficiency, accuracy, productivity and cost-effectiveness.

And asTony Harris concluded: 'When we need additional surfacegrinding capacity we will undoubtedly go back to the 600 Centre,because these two machines have transformed the way we wereworking.

A new versatile, variable speed 3in die grinder offers a torque three times higher than similar units, making it ideal for grinding internal surfaces in polishing and finishing applications.

A new versatile, variable speed 3in die grinder that offers a torque three times higher (27 inch lb.) than similar units, making it ideal for grinding internal surfaces in polishing and finishing applications, has been introduced by Metabo. The new GE900 Plus is geared to run at a lower rpm range than similar grinders, which increases the number and type of usable accessories for sanding, polishing or buffing, such as flap wheels and non-woven abrasive finishing wheels. The new grinder is designed for ease-of-use, featuring a side handle for increased user control and a spindle lock-one wrench feature that enables users to change accessories using only one wrench instead of two.

The switch is ergonomically located on the top of the tool, making it easy to operate with either the right or left hand.

Metabo's Vario-Constamatic (VC) full-wave electronic speed control allows users to vary speed to accommodate a variety of accessories, making the GE900 Plus useful for grinding and cutting a wide range of materials, from hard to soft, including plastic.

The GE900 Plus has a hardened and ground 1/4in collet for accurate balance of fitted attachments, and auto-stop carbon brushes that increase brush life while preventing motor damage that can be caused by worn brushes.

The grinder has a no-load speed of 2,500 - 6,000 rpm and is rated at 7.5 amps, 900 watts.

A collet wrench, spindle wrench, the 1/4in collet, and the side handle are all offered as standard with the GE900 Plus.

Increased machine rigidity, longer X-axis travels and higher speeds and the capability of taking larger wheelheads, feature a new versatile cylindrical grinder.

Increased machine rigidity, longer X-axis travels and higherspeeds and the capability of taking larger wheelheads, feature anew versatile cylindrical grinder. Future models will includehard turning operations. The concept and dimensions of the S41cnccylindrical grinder are comparable with the proven S40cnc, butfeatures some recently developed elements and modifications readyfor a new generation of wheelheads and further peripheralelements.

The S41cnc is the first machine which comes with thenew Studer design concept.

* Increased machine bed rigidity,optimised for workpieces of up to 180kg (396lb).

* Pre-Loadedhydrostatic guideways in the X-axis (feed motion).

To thecustomer's advantage is the optimal dynamic behaviour forform grinding, taper grinding and interpolation grinding,combined with increased rigidity.

* Longer in X-axis travel, now300mm (11.8in).

* Increased axis speed in X, now 15m/min(590in/min).

* Larger distance between the guideways of theZ-axis, providing more rigidity against the feed forces whenplunge grinding.

* Massive layout of the longitudinal guideway.Increased longitudinal table stability.

* Longer longitudinalslide to make sure that dressing attachments and similarequipment can be mounted.

* Longer in Z-axis travel, now 1200mm(47in).

* Increased axis speed in Z, now 15m/min (590in/min).

*The absolute length measuring systems of the axes X and Z makereferencing at machine start unnecessary.

* Larger swivel radiusof the B axis: I e a larger wheel-head can be installed.

* Newmaintenance and service-friendly enclosure concept.

* Better workarea accessibility when loading from the top (i e portal loader).* Energy supply on the Z-axis prepared for additional options.

*New control FANUC 16i or 160i.

With the control 160i, thismachine is now entirely compatible with Windows applications andwith both control types connections to networks via Ethernetinterfaces are possible.

* Generally, actuators and sensors areconnected by means of ASi-Bus.

This simplifies retrofits.

Futureapplications and procedures - further developments will follow,especially with regard to wheelhead layouts.

A glance towards thefuture of the S41cnc reveals the following: * Dual motor spindlewheelhead with up to four grinding wheels 500mm (20in) diameter.* Integration hard turning operations, either with a single tool(only one turning operation, e g internal profile turning of anHSK taper shoulder) or by means of an indexing tool holder.

*Y-axis to grind longitudinal grooves.

* A-axis applications togrind threads with slanted pitch angles.

The S41cnc has beendemonstrated hard turning and grinding a HSK63 tool holder.

A cylindrical, external grinding machine offers much wider scope with regard to accuracy, quality and concept, and at an extremely competitive price.

The cylindrical, external grinding machine eco650 offers muchwider scope with regard to accuracy, quality and concept, and atan extremely competitive price. The machine is many times provenin job shops in the field of tool making. There is also therevolutionary eco1000 for machining long and shaft-likeworkpieces to the well-known Studer quality.

Also this machine issold at a price which is outstanding in its category.

The mostimportant features in brief * Distance between the centres: 1000mm/40in.

* Centres height 175 mm/6.9in.

* Machine bed in StuderGranitan S103 with 3-point support.

* Vee and flat guideways withthe patented knob-type coating in Studer Granitan S200.

* Rotarymeasuring system for the axes X and Z with a revolution of0,0001mm/0,000,004in (a linear measuring system is available as aretrofit kit).

* grinding wheel layout on the right hand side,orientable to 0 degree and to 30 degrees for straight and plungegrinding.

* Rigid, roller bearing grinding spindle with a drivepower of 7.5kW/10HP.

* Grinding wheel diameter up to 500mm/ 20in.* Roller bearing workhead for grinding between fixed or rotarycentres, with tool retention taper MT5.

* tailstock with quilldiameter 50mm/1.97in and retention taper MT3.

* Orientablelongitudinal table, tilt up to 8.5 degrees for grinding highlyaccurate tapers.

* CNC control FANUC 21i.

* Programming with theStuder prictogramming software.

* Compact layout and attractivedesign.

* Excellent view onto the working process and optimalaccess.

* Additional equipment in the shape of retrofit kits isavailable.

Such devices can be installed by the customer and nospecial knowledge or training is required.

S31leanCNC withdistance between centres of 1000 mm/40 - this machine conceptcannot be compared to anything else with regard to universal usein the field of complete machining.

With the S31leanCNC1000 allyour requirements and wishes can be fulfilled.

Maximumflexibility thanks to the proven turret-type wheelhead withexternal grinding wheels on the left and on the right side togrind diameters and shoulders as well as internal operations oncomplex workpieces, in a single clamping.

Interactive hand wheelmode - this operator-friendly element which plays an importantrole in the successful history of the S30leanPRO is now alsoavailable on the S31leanCNC.

The most important features are, inbrief: * Distance between centres: 1000mm/40in.

* Centre height175mm/6.9in.

* Machine bed in Studer Granitan S103 with 3-pointsupport.

* Vee and flat guideways in the patented knob-typecoating in Studer Granitan S200.

* Rotary measuring to aresolution of 0,0001mm/0,000,004in on the axes X and Z.

*Universal, orientable wheelhead, manual positioning 2,5deg andoptional automatic positioning in1deg.

* Motor grinding spindlewith infinitely adjustable speed control and a drive power of7,5kW/10HP.

* Grinding wheel diameters up to 500mm/20in, rightand left side.

* Workhead with roller bearing for grindingbetween stationary or rotary centres with tool taper ISO50.

*Tailstock with quill diameter 50mm/1.97in.

and tool taper MTK3.

*CNC control FANUC 2li.

* Programming by means of the Studerpictogramming software.

* Hand wheels to influence the grindingprocess manually through the axes X and Z, by means of the StuderInteract software.