Equipment for Refacing theValve Seats and Valves

of Marine and StationaryDiesel Engines

Catalog M11

ExperiencePerformance

Quality

HUNGER - a company with experience - specializing in themanufacture of engine valve service equipment for manyyears - and with the most comprehensive range of valve ser-vice equipment.

Years ago, HUNGER pioneered precision valve and valveseat refacing systems which have been further developedand refined until we have the present high performanceequipment.

The qualities of HUNGER equipment are derived from wor-king in very close cooperation with leading engine manufac-turers, and the research and experience gained byHUNGER in over 75 years of precision equipment manufac-ture.

HUNGER equipment has been tested an approved by lea-ding engine manufacturers, and is being used for high per-formance work throughout the world.

You can rely on HUNGER.

In addition to the products listed in this catalog HUNGERalso manufactures the following products:

Valve service equipment for automotive engines. Special tools for automotive engine rebuilders.Hand reamers in various designs for repair and assemblyjobs.

HUNGER will be please to send you further information onrequest.

We are constantly searching for ways to improve HUNGER products.Improvements may be made at any time. Therefore, specifications forproducts listed in this catalog may be changed without notice.

HUNGER Products Page

Valve Seat Refacing:

VDS 2E Handy valve seat refacing machines 4VDS 2.3E for valve seats up to 140 mm in diameterVDS 2.5E

VD 4E Compact valve seat refacing machine 5for valve seats from 70 to 250 mm in diameter

VD 5E Powerful valve seat refacing machine 6for valve seats from 200 to 500 mm in diameter

VD 3 The simple valve seat refacing tool 7for valve seats from 60 to 200 mm in diameter

SB 2 Compact valve seat grinding machine 8for valve seats up to 110 mm in diameter

SB 3 The precision valve seat grinding machines 9SB 3M for valve seats up to 200 mm in diameterSB 3S

Valve Refacing:

VKM 2A The compact precision grinding machines 10VKM 2.3A for valves up to 32 mm in stem diameterVKM 2.3M

VKM 3.0 The low cost grinding machines 11VKM 3.1 for valves up to 41 mm in stem diameterVKM 3.4

VKM 4A The heavy duty precision grinding machine 12for valves up to 50 mm in stem diameter

VKM 5 The extra heavy precision grinding machine 13for valves up to 110 mm in stem diameter

SG 175 Support grinder 14for grinding valves on a lathe

Counterboring:

ADM 4E Counterboring machine 15for installing oversize valve seat inserts

Handy machines for refacing valve seatsup to 140 mm in diameter

Specifications: VDS 2E VDS 2.3E VDS 2.5E

Capacity:Valve seat diam. mm 35 - 90 35 - 110 35 - 140Valve seat angle deg. 45°, 35°, 30° 45°, 40°, 35° 45°, 30°

25°, 20°, 0° 25°, 20° 0°

Feed motions:Speed rpm 270/360 270/360 270/360Transverse feed mm/rev. 0,05 0,05 0,05

Electrical system:Operating voltage VDC 38/50 38/50 38/50Rated current A 7/7,5 7/7,5 7/7,5Supply voltage VAC 230 230 230(1 ph. 50/60 Hz) or 120 or 120 or 120

Dimensions & Weight:Width mm 300 400 400Height mm 350 350 350Net weight approx. kg 6 9 9,5

Advantages:Extremely short machining time!No abrasive dust!No noise!

Working Principle:The valve seat is refaced to the pre-set depth by the simultaneous appli-ca-tion of both a rotary and a trans-verse feed motion to the single pointcutter.While the cutter rotates in a circlearound the valve seat, a feed gearmechanism ensures a continuousoutward transverse feed motionunder the proper seat angle. This angle is defined by an inclinedslideway provided for the tool slidein the exchangable adapter head.The lathe-type refacing action pro-vides a flawless concentric seatingsurface texture for a complete valveseal.

Handling:Setup is fast and easy.First, lock the pilot with mountedcentering spider in the valve guide. Then, lower the machine over thepilot and position the cutter in frontof the inner edge of the valve seat. Turn micrometer downfeed to set thedesired depth of cut.Refacing is automatic.Pressing one button is enough tostart both the rotation and the trans-verse feed of the cutter.

Features:Power drive unit includes two lowvoltage motors providing smoothcutting action.Exchangeable adapter head withbuilt-in slideway for cutter travelensures precise seat angle.Roundness, concentricity and surfacefinish are within manufacturers’ spe-cifications or even better.The machine has been tested andapproved by the leading engine

The New Generation:VDS 2EVDS 2.3EVDS 2.5E

Compact machine for refacing valve seatsup to 250 mm in diameter

Advantages:Extremely short refacing time!No abrasive dust!No noise!

Working Principle:The valve seat is refaced to the pre-set depth by the simultaneous appli-ca-tion of both a rotary and a trans-verse feed motion to the single pointcutter.

While the cutter rotates in a circlearound the valve seat, a feed gearmechanism ensures a continuousoutward transverse feed motionunder the proper seat angle. This angle is defined by an inclinedslideway provided for the tool slidein the exchangable adapter head.

The lathe-type refacing action pro-vides a flawless concentric seatingsurface texture for a complete valveseal.

Features:The machine is fitted with twomotors providing a smooth cuttingaction.The speed of the motors is infinitelyvariable so that the circular motionof the cutter around the valve seatcan be adapted to the diameter andmaterial of the valve seat.The motors are of the low voltagetype to eliminate electric hazards.The control circuits are housed in aseparate power supply unit to reducethe weight of the machine for ease ofhandling.The exchangeable adapter head withthe built-in slideway for cutter travelensures a precise seat angle.Roundness, concentricity and surfacefinish of the refaced valve seat arewithin manufacturers’ specificationsor even better.The machine has been tested andapproved by the leading enginemanufacturers.

The New Generation:VD 4E

Specifications:Capacity:Valve seat diam. 70 - 250 mmValve seat angle 45°, 40°, 30°

20° & 0°

Feed motionsSpeed 120 - 270 rpmTransverse feed 0,05 mm/rev.

Electrical system:Operating voltage max. 50 VDCRated current max. 10 ASupply voltage 230 VAC(1 ph. 50/60 Hz) or 120 VAC

Dimensions & Weight:Width 380 mmHeight 400 mmNet weight approx. 17 kg

Handling:Setup is fast and easy.

First, lock the pilot withmounted centering spider in the valve guide. Then, lower the machine over the pilot and position the cutter in front of the inner edge of the valve seat. Turn micrometer downfeed to set the desired depth of cut.

Refacing is automatic.

Pressing one button isenough to start both the rota-tion and the transverse feedof the cutter.

Powerful machine for refacing valve seatsfrom 200 to 500 mm in diameter

Advantages:Extremely short refacing time!No abrasive dust!No noise!

Working Principle:The VD 5E machines the valve seatin a lathe-type facing action.The valve seat is refaced to the pre-set depth by the simultaneous appli-cation of both a rotary and a trans-verse feed motion to the single pointcarbide cutter.

While the cutter rotates in a circlearound the valve seat, a feed gearmechanism ensures a continuousoutward transverse feed motionunder the proper seat angle. This angle is defined by an inclinedslideway for the tool slide carryingthe cutter.

The lathe-type refacing action provi-des a flawless concentric seating sur-face texture for a complete valveseal.

Features:The machine is fitted with twomotors providing smooth cuttingaction.The speed of the motors is infinitelyadjustable so that the cutting speedcan be adapted to the diameter andmaterial of the valve seat.The controls are housed in a separatepower supply unit for ease of hand-ling.The exchangeable adapter head withbuilt-in slideway for cutter travelensures a precise seat angle.The machine has been tested andapproved by a leading slow speedengine manufacturer.

The New Generation:VD 5E

Specifications:Capacity:Valve seat diam. 200 - 500 mmValve seat angle 30°

Feed motions:Speed 150 - 300 rpmTransverse feed 0,05 mm/rev.

Electrical system:Supply voltage 230 V(single phase) 50/60 HzRated current max. 4 A

Dimensions & weight:Width 400 mmHeight 650 mmNet weight approx. 70 kg

Handling:Set up is fast and easy.First, lock the pilot in thevalve guide. Then, lower the machine overthe pilot and position the cut-ter in front of the inner edgeof the valve seat. Turn micrometer infeed to setthe desired depth of cut.Refacing is automatic.Pressing one button is enoughto start rotation and transversefeed of the cutter.Roundness, concentricity andsurface finish within manu-facturers´ specifications.

VD 3 The simple valve seat refacing systemfor valve seats up to 200 mm in diameter

Specifications:Capacity:Valve seat diam. 60 - 200 mmValve seat angle 45° & 30°

or 45° & 35°or 30° & 20°

Tool Head:Drive manual

Feed rate:Transverse feed 0,05 mm/rev.

Dimensions & Weight:Width 300 mmDepth 250 mmHeight 350 mmNet weight approx. 8kg

Application:The VD 3 is a low cost handtool for refacing valve seats.The VD 3 refaces even hardseats and especially toughseat materials like Nimonicwhich, when machined bygrinding, tend to load thegrinding wheel rather fast.Roundness, concentricity andsurface finish of the refacedvalve seat are within manu-facturers’ specifications.

Working principle:The VD 3 machines the valve seat ina lathe-type facing operation.A pilot is locked in the valve guideto align the VD 3 in centerline withthe valve guide.The VD 3 is placed on top of thepilot. With the single point carbide cutterpositioned in front of the inside edgeof the valve seat, the proper depth ofcut is set.The depth of cut is set by a micro-meter mechanism to maintain positi-ve control over the stock to be remo-ved from the valve seat.When the VD 3 is then rotated onthe pilot, the cutter travels in a circlearound the valve seat with con-tinuous outward transverse feedmotion under the proper seat angle.As a result, the seat is refaced toconcentricity with the valve guideunder the correct seat angle

Features:The tool head includes two tool-sli-des guided in dove-tailed slide-waysinclined under different valve seatangles.The single point carbide cutter canbe attached to either toolslide.A feed gear mechanism in the toolhead ensures continuous tool slidetraverse, when the VD 3 is rotatedaround the pilot.Cutters with indexable carbide ins-erts are available in addition to stan-dard carbide tipped cutters.The standard carbide tipped cutterscan be resharpened on a normal toolsharpener.Solid and adjustable pilots are avai-lable to align the VD 3 in centerlinewith the valve guide.

SB 2 The compact precision grinding machinefor valve seats up to 110 mm in diameter

Specifications:Capacity:Valve seat diam. 55 - 110 mmValve Seat angle 20° - 45°

Grinding spindleWheel diam. 50 mmNo load speed 15 000 rpm

Feed rates:Circular motion 4 - 30 rpmTransverse motion 2 - 9 mm/min

Electrical system:Operating voltage 42 VDCPower consumption 750 WSupply voltage 230 V(1ph. 50/60 Hz) or 110 V

Dimensions & Weight:Width 500 mmDepth 160 mmHeight 470 mmNet weight approx. 12 kg

Handling:Setup is fast and easy!

First, insert the pilot in thevalve guide. Then, lower themachine over the pilot andposition the grinding wheel infront of the inner edge of thevalve seat. Set the desired depth of cut.

Grinding is automatic!

Turning the control knobs isenough to start both the circu-lar motion and the transversemotion of the grinding wheel.

Working Principle:The machine is aligned in centerlinewith the valve guide by a pilot whichis locked in the valve guide.Prior to starting the automatic grin-ding operation, the depth of cut is setwith the grinding wheel in front ofthe inside edge of the valve seat. The seat is then refaced to the presetdepht by the simultaneous applica-tion of a circular feed motion and atransverse feed motion to the grin-ding wheel. While the grinding wheel itself isrevolving with the grinding spindleat high speed, the spindle and thewheel are also travelling slowly aro-und the valve seat in a circle withsimultaneous transverse feed motionacross the valve seat. As a result, the valve seat is refacedto concentricity with the valve guideunder the correct seat angle.

Features:The machine is fitted with low vol-tage motors to eliminate electrichazards.

The electrical controls are housed ina separate control unit to reduce theweight of the machine for ease ofhandling.

The unique asymetrical design of theguiding tube for the grinding headenables the use of larger-sized grin-ding wheels ensuring superior grin-ding action and excellent valve seatfinish.

Independent variable speed motorsare provided so that both the circularmotion of the grinding wheel aroundthe valve seat and the transversemotion of the grinding wheel acrossthe valve seat can be adapted to thevalve seat material by the mere turnof the respective control knob.

SB 3 The precision valve seat grinding machinesSB 3M for valve seats up to 200 mm in diameterSB 3S

Specifications: SB 3 SB 3M SB 3S

Capacity:Valve seat diam. mm 60 - 200 105 - 200 105 - 200Valve seat angle deg. 30° & 45° 30° 30° & 45°

Grinding spindle:Wheel diam. mm 32 50 50No load speed rpm 27 000 11 000 11 000Drive motor W 500 500 500

Feed rates:Circular motion rpm 5 - 25 5 - 25 5 - 25Transverse motion mm/rev. 0,3 0,3 0,3

Electrical system:Supply voltage V 220 - 240 220 - 240 220 - 240(1 ph., 50/60 Hz)Max. consumption W 600 600 600

Dimensions & Weight:Width mm 600 600 600Depth mm 250 250 250Heigth mm 500 500 500Net weight approx. kg 18 18 18

Working Principle:The machine is aligned in centerlinewith the valve guide by a pilot whichis locked in the valve guide.Prior to starting the automatic grin-ding operation, the depth of cut is setwith the grinding wheel in front ofthe inside edge of the valve seat. Theseat is then refaced to the presetdepht by the simultaneous applica-tion of a circular feed motion and atransverse feed motion to the grin-ding wheel. While the grinding wheel itself isrevolving with the grinding spindleat high speed, the spindle and thewheel are also travelling slowly aro-und the valve seat in a circle withsimultaneous transverse feed motionacross the valve seat. As a result, the valve seat is refacedto concentricity with the valve guideunder the correct seat angle.

Features:The grinding head includes a dove-tailed slideway inclined under a seatangle of 30° and in some models afurther dove-tailed slideway inclinedunder a seat angle of 45°.The grinding slide carrying theheavy duty grinding spindle fits intoeither slideway.Either slideway is adjustable tomaintain long term accuracy.Excellent valve seat finish due to themotorized drive unit which includesa variable speed motor to adapt thefeed rates to the valve seat material.The depth of cut is set by a micro-meter mechanism to maintain positi-ve control over the stock to be remo-ved from the valve seat.The basic SB 3 model includes abuilt-in dressing attachment for rapidin-situ dressing of the grindingwheel.

VKM 2A The compact precision grinding machinesVKM 2.3A for valves up to 32 mm in stem diameterVKM 2.3M

Specifications: VKM 2A VKM 2.3A VKM 2.3MCapacity:Valve stem diam. mm 3,2-22,5 3,2-25 9,5-32Max. valve head diam. mm 200 200 200Valve seat angle deg. 19° - 47° 19° - 47° 19° - 47°

Grinding spindle:Wheel diam. mm 175 175 175Wheel width mm 25 25 25Speed at 50 cycles rpm 2790 2790 2790Drive motor W 370 370 370

Work spindle:Speed (Standard) rpm 50 50 50Speed range (Option) rpm 5 - 85 5 - 85 5 - 85

Coolant system:Coolant capacity l 5 5 5

Electrical system:Supply voltage V 380 - 440 380 - 440 380 - 440(3 ph. 50/60 Hz) or V 220 - 254 220 - 254 220 - 254Control voltage V 24 24 24Max. consumption W 500 500 500

Dimensions & Weight:Length mm 800 800 800Width mm 550 550 550Height mm 450 450 450Net weight approx. kg 150 155 155

Features:Machine Base:Heavily ribbed cast iron structurewith integrated slideway for wheel-head .

Wheelhead:Box type monobloc casting noted forexcellent vibration dampening.Permanently sealed and lubricatedgrinding spindle.

Workhead:Monobloc work spindle housingwith permanently sealed and lubrica-ted work spindle bearings. Work spindle fitted with collet chuckfor use of high precision collets.Workhead located on an elongatedswivel plate provided with a wide-spaced scale for angular adjustment. The workhead is adjustable along theswivel plate to clamp each valve onthat part of the valve stem whichnormally travels in the valve guide.The workhead table is mounted onguide bars to reduce friction forsmooth traversing of the valve faceacross the grinding wheel.Oscillating equipment for automatedpower traverse of the workhead tableis available as an option to assureefficient stock removal and superiorfinish. The stroke of oscillation isinfinitely adjustable.

Steady:A selfcentering steady (a VKM 2.3 Aand VKM 2.3M standard) fits on theswivel plate for additional support oflong stem valves. The combinationof collet chucking and steadyingensures perfect alignment of longvalves.

Coolant system:Coolant is delivered to the grindingsite by an industrial type floodpump.The baffled coolant tank is housed inthe machine base and can be drawn

VKM 3.0 The low cost grinding machines VKM 3.1 for valves up to 41 mm in stem diameterVKM 3.4

Specifications: VKM 3.0 VKM 3.1 VKM 3.4Capacity:Valve stem diam. mm 9,5-22,5 9,5-32 15,9-41Max. valve head diam. mm 200 200 200Valve seat angle deg. 27° - 46° 27° - 46° 27° - 46°

Grinding spindle:Wheel diam. mm 175 175 175Wheel width mm 25 25 25Speed at 50 Hz rpm 2790 2790 2790Grinding spindle motor W 370 370 370

Work spindle:Speed rpm 25 25 35Work spindle motor W 34 34 120

Coolant system:Coolant capacity l 5 5 5Pump motor W 50 50 50

Electrical system:Supply voltage V 380 - 440 380 - 440 380 - 440(3 ph. 50/60 Hz) or V 220 - 254 220 - 254 220 - 254Max. consumption W 500 500 600

Dimensions & Weight:Length mm 850 850 850Width mm 680 680 680Height mm 400 400 450Net weight approx. kg 95 95 100

Application:Recommended as accessories tolarge diesel engines for regrindingthe valves in course of the periodicaloverhauls.

Features:Machine Base:Box type monobloc casting with in-tegrated slideway for the workhead.

Grinding Spindle:The permanently sealed and lubri-cated grinding spindle is slideablymounted on a swivel plate.The swivel plate is set the the properangular position by means of a widespaced scale.

Workhead:Monobloc work spindle housingwith permanently sealed and lubrica-ted spindle bearings. Work spindle fitted with collet chuckfor use of high precision collets.The workhead can be moved alongthe slideway on top of the machinebase to clamp each valve on that partof the valve stem which normallytravels in the valve guide.A micrometer feed unit is combinedwith the workhead to feed the valvehead of a valve clamped in the workspindle into the grinding wheel.

Steady:A selfcentering steady (a VKM 3.1and VKM 3.4 standard) fits onto theswivel plate for additional support oflong stem valves. The combinationof collet chucking and steadyingensures perfect alignment of longvalves.

Coolant system:Coolant is delivered to the grindingsite by an industrial type floodpump.The baffled coolant tank is housed inthe machine base and can be drawnout for ease of cleaning.

VKM 4A The heavy duty precision grinding machinefor valves up to 50 mm in stem diameter

Specifications:Capacity:Valve stem diam. 6,4 - 50 mmValve head diam. max. 320 mmValve seat angle 15° - 90°

Grinding spindle:Wheel diam. 250 mmWheel width 40 mmSpeed at 50 Hz 2880 rpmDrive motor 1,2 kW

Work spindle:Speed 5 - 50 rpmDrive motor 0,09 kW

Coolant system:Coolant capacity 12 lPump motor 0,05 kW

Electrical system:Supply voltage 380 - 440 V(3 ph. 50/60 Hz) or 220 - 254 VMax. consumption 1,7 kW

Dimensions & Weight:Length 1550 mmWidth 900 mmHeight 950 mmNet weight approx. 300 kg

Workhead:Monobloc work spindle housingwith permanently sealed and lubri-cated spindle bearings. Work spindle fitted with colletchuck for use of high precisioncollets.The workhead is located on anelongated swivel plate providedwith a wide-spaced scale for angu-lar adjustment.Index stops with micrometeradjustment at 30° and 45°. The workhead is adjustable alongthe swivel plate to clamp eachvalve on that part of the valvestem which normally travels in thevalve guide.An optional selfcentering steadyfits on the swivel plate for additio-nal support of long stem valves.The combination of colletchucking and steadying ensuresperfect alignment of long valves.The workhead table is mounted onguide bars to reduce friction forsmooth traversing of the valveface across the grinding wheel.

Coolant system:The baffled coolant tank is housedin the machine base and can bedrawn out for ease of cleaning.

Options:Oscillating equipmentAutomated power traverse of theworkhead table is available toassure efficient stock removal andsuperior finish. The stroke ofoscillation is infinitely adjustable.

Automated infeedPower infeed is available for auto-matic grinding according to a pre-selected grinding program. Thetotal infeed, the feed rate and thesparkout time are easily selectedby the mere turn of code switches.

Application:Due to the rigid construction theVKM 4A is particularly suited for volume engine rebuilders andhigh performance shops.

Features:Machine base:Heavily ripped cast iron structurefor vibration free performance.

Wheelhead:Box type monobloc casting notedfor excellent vibration dampeningcharacteristics. Powerful grinding spindle per-manently sealed and lubricated for lifetime accuracy.

Dressing attachment:The dressing attachment houses in the wheelhead for rapid wheeldressing, also with the valvechucked in the work spindle. Individual handwheel for traversing the diamond dresser acrossthe grinding wheel.

VKM 5 The extra heavy precision grinding machinefor valves up to 110 mm in stem diameter

Specifications:Capacity:Valve stem diam. 40 - 110 mm

optional from 6,5 mmValve head diam. max. 500 mmValve seat angle 28° - 47°

Grinding spindle:Wheel diam. 250 mmSpeed at 50 Hz 2880 rpmDrive motor 1,2 kW

Work spindle:Speed 3 - 14 rpmDrive motor 0,12 kW

Coolant system:Coolant capacity 30 lPump motor 0,05 kW

Electrical system:Supply voltage 380 - 440 V(3 ph. 50/60 Hz) or 220 - 254 VMax. consumption 1,5 kW

Dimensions & Weight:Length 1950 mmWidth 1300 mmHeight 900 mmNet weight approx. 900 kg

Workhead and Steadies:The universal VKM 5 model fea-tures two selfcentering steadies toalign and clamp all valves from 40to 90 mm in stem diameter.The workhead of the universalmodel is fitted with a driver platefor rotating the valve.The standard VKM 5 model is tai-lored to a particular engine to beserviced and includes only onesteady and a collet chuck in theworkhead to grip the valve of theparticular engine to be serviced.The workhead and the steadies canbe individually located along theslideway on top of the machinebase to clamp each valve on thatpart of the valve stem which nor-mally travels in the valve guide.

Coolant system:A separate coolant tank is provi-ded to efficiently settle out grin-ding residue. Coolant is deliveredto the grinding site by an industrialtype flood pump.

Options:Oscillating equipmentAutomated power traverse of thetransverse slide is available toassure efficient stock removal andsuperior finish. The stroke ofoscillation is infinitely adjustable.

Automated infeedPower infeed is available for auto-matic grinding according to a pre-selected grinding program. Thetotal infeed, the feed rate and thesparkout time are easily selectedby the mere turn of code switches.

Three-jaw chuckFor grinding the valve seat ringsof large B&W two stroke dieselengines, the workhead can be fit-ted with a three-jaw chuck to gripthe valve seat rings.

Application:The VKM 5 is designed to grindvery big valves, especially the val-ves of Sulzer RTA type engines.

Features:Machine base:Extra heavy rigid cast iron con-struction with an integrated dove-tail slideway for the workhead and steadies.

Grinding spindle:The powerful grinding spindle ispermanently sealed and lubricatedfor lifetime accuracy.The grinding spindle rests on acompound slide unit including amassive swivel plate with a wide-spaced scale for exact angularadjustment.The transverse slide is guided by apair of steel bars to reduce frictionfor smooth traversing of the grin-ding wheel along the valve face.

SG 175 Support grinder for grinding valves on a lathe

Specifications:Grinding spindle:Grinding wheel diam. 175 mmGrinding wheel width 25 mmSpeed at 50 cycles 2790 rpm

Electrical system:Supply voltage 380-440 V(3 ph. 50/60 Hz) or 220-254 VPower consumption 370 W

Dimensions & Weigth:Width 380 mmLength 300 mmNet weight approx. 16 kg

Application:The SG 175 support grinder isdesigned for grinding the coni-cal seating surface of valves ofmedium speed diesel engineson a standard lathe.

Handling:The support grinder is clamped in the toolpost located on the top slideof the lathe.

The grinding angle corresponding tothe required valve seat angle is adju-sted by turning the top slide of thelathe to an angular position which corresponds to the valve seatangle and which is defined by thetemplate supplied with the grinder.

The valve stem is clamped in thechuck of the lathe and the valve faceis ground by feeding the grindingwheel into the rotating valve face.

Features:The precision grinding spindle ispermanetly sealed and lubricated forlifetime accuracy.

The spindle drive motor in com-bination with the 175 mm diametergrinding wheel allows fast stockremoval.

The wheel guarding system is desi-gned to the prevailing safety regula-tions.

The cone-shaped head of the templa-te is provided with a bore receivingthe dressing diamondso that the grinding wheel can beproperly dressed after adjustment of the grinding angle.

The switch for the grinding spindledrive motor is integrated in the ter-minal box of the motor.

Counterboring machinefor installing oversize valve seat inserts

Working Principle:The ADM 4E is aligned in centerlinewith the valve guide by means of apilot inserted into the valve guide. The counterbore is machined in alathe-type turning action to thepreset diameter by the simul-taneous application of both a cir-cular and an axial feed motion tothe single point cutter.While the cutter rotates aroundthe counterbore, a feed gearmecha-nism ensures a continuousaxial feed motion which is defi-ned by a slideway in the toolhead.

Features:The machine is fitted with two mo-tors providing a smooth cuttingaction.The speed of the motors is infinitelyvariable so that the circular motionof the cutter around the counterborecan be adapted to the diameter andthe material to be cut.The motors are of the low voltagetype to eliminate electric hazards.The control circuits are housed in aseparate power supply unit to reducethe weight of the machine for ease ofhandling.Various tool heads are available tocover a broad diameter range.For instance, a typical tool headcovers a diameter range from 150to 190 mm.The tool slide guided in the toolhead for axial feed motion is fit-ted with a fine boring head forcoarse adjustment of the turningdiameter as well as precise radialsetting of the cutter by means of acircular scale to ensure high pre-cision machining to IT6 toleran-ces. The tool head includes a frictioncoupling so that axial feed motion of

The New Generation:ADM 4E

Specifications:Capacity:Counterbore diam. 70 - 250 mm

Feed rates:Speed 120 - 270 rpmAxial feed 0,05 mm/rev.

Electrical system:Operating voltage max. 50 VDCRated current max. 10 ASupply voltage 230 VAC(1 ph. 50/60 Hz) or 120 VAC

Dimensions & Weight:Width 380 mmHeigth 400 mmNet weight approx. 17 kg

Application:The Hunger ADM 4E is desi-gned to precision machine thevalve seat ring counter-boresin cylinder heads to producesmooth and closely fittingcontact surfaces for oversizevalve seat rings.