RM 1016 US-e HM Series Modular Balancing Machines

8/3/2019 RM 1016 US-e HM Series Modular Balancing Machines

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RM 1016 US-e

HM-series modular balancing machines

Precision accuracy and maximum flexibility for universal applications


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C O N T E N T S

Introduction

The practice

The various modules Overview Mechanical equipment Drive Measuring instrumentationSafety equipment

Correcting

Ergonomics

Technical details

Fax questionnaire

Instruction sheet

Balancing creates quality

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Increasing demands

More sophisticated technical developments have lead to constantly

increasing requirements with regard to balancing quality. Higher

performance for applications such as high-speed tool spindles,

electric motors, turbines, fans, universal joint shafts or paper rolls

simply mean higher speed. The trend is clear, and in order to meet

these requirements precision balancing is essential. Accurately

balanced rotors allow us to safely reach higher speeds and deliver

considerably higher performance.


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Balancing enhances quality

Unless it is corrected, the effect of unbalance will often only

become noticeable in the finished product. If rotors are not

balanced, they can cause undesired or even dangerous vibrations.

They can also diminish the practical value of a machine, cause

damage to the bearing, or fractures to the casing, suspension or

foundation. Excessive noise and vibration may also irritate or

annoy the user and lead them to conclude that the product is of

poor quality. Thus, a product that is free from noise and vibration

is always a sign of quality, precision and craftsmanship.


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Belt drives for precision

Rotors with high operating speeds such

as this separator must be balanced

very accurately. The ideal solution for

such rotors is an underslung belt drive.

It prevents inaccuracies of mechanical

drive elements from affecting the rotor

unbalance readout.

Additional modules for versatility

The range of applications for the modular

universal balancing machine can easily

be increased by the use of additional

modules. This enables you to balance,

not only small electric motor armatures,

spindles, etc., but also tools and

toolholders quickly and accurately.

(For the exclusive balancing of

toolholders, we offer special balancing

machines.)

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The practice is the yardstick


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Overslung belt drives for convenience

For balancing small and medium size

lots, the overslung belt drive is the perfect

solution because it enables quick and

uncomplicated loading and unloading of

the rotors.

End drives for large inertia masses

Rotors with large flywheels require

high drive torques. The end drive is best

suited for these conditions. A split bed

makes it possible to mount workpieces

of a very large diameter. The possibility

of moving the drive in axial direction

enables easy and ergonomic working,

even with such rotors.

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Safety devices for any application

These electric motor armatures of up to

40,000 lbs. are balanced by applying

weights. The safety enclosure of the

protection class C according to ISO 7475

protects the surroundings against parts

that might fly off the rotor. The safety

enclosure is operated via a motor and

provides full access to the machine

when open.

Flexible rotors on hard-bearing balancing

machines

Rolls for paper or foil producing machines

often show an elastic behavior and must

be balanced in two or more correction

planes at high speed. On the hard-bearing

balancing machine you can bring the

rotors up to operating speed in order to

determine deflection and resonance during

acceleration. This data is used as the basis

for calculating the appropriate correction

weights.

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for measuring the efficiency of our HM machines


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Balancing at low and high speeds

Rotors of textile machines are balanced at

low and at high speeds. Consequently the

machine must meet very high dynamic

requirements. It must be suited for very exact

2-plane measurement of rigid rotors at low

speed as well as for testing flexible rotors up

to the maximum operating speed.

top right:

Spindle-bearing support for balancing

universal joint shafts

Universal joint shafts are accommodated

between spindles for balancing. A bear-

ing support and catching device that can

be moved by means of a motor facilitate

re-setting for another type of universal

joint shaft.


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Combine these five components for precision balancing results

A modular design for safety andflexibilityThe concept of the HM-series givesyou flexibility with the importantmachine modules. These fivemodules consist of the mechanicalequipment, drive, measuring unit,safety device and correction unitwhich can be perfectly adapted toyour balancing requirements.The best combination of compo-nents depends on many details: Are there many different rotor

sizes as in a repair shop, or do you

balance only one or two rotortypes in a production application?

What are the dimensions andweights of the rotors?

How are they loaded? What accuracy is required? Is it a rigid or a flexible rotor?Nothing is impossible with HMSeries balancing machines, or better,nearly everything is possible fromstandard universal machines up tocompletely integrated and customized

solutions.The flexibility of these machines isendless. If the requirements changewith your rotor program, the existingbalancing machine can generally beupgraded at low cost and with littleeffort.Simply complete the questionnaireattached to this brochure and tell usyour balancing requirements. Wewill then send you a proposal that isperfectly tailored to your application.

Versatile mechanical modules allowyou to balance a large range of

workpieces quickly and precisely.All modules can easily be adjustedto your rotor program at littleexpense.Based on standard lengths, themachine beds can be specified tomeet your individual requirements.The type of rotor support in thebalancing machine is chosen byyou according to your rotor design: roller carriages for rotors with

their own journals inclined roller bearings for rotors

to be balanced together withmounted bearings

bearing supports with sleevebearings for heavy rotors whichcannot be supported by rollerbearings, and

custom engineered designs forbalancing complete assemblies oruniversal joint shafts

See page 10 for further details

Mechanical equipment Drive

Our modular design offers the propersolution for any rotor or balancing

process. the underslung belt drive is an

economic solution that is appropriatefor rotors with a smooth outersurface

the overslung belt drive is the bestsolution if you have to balance alarge number of rotors and want theadvantages of a belt drive for thispurpose

the end drive is used if the surfaceof the rotor does not allow for a beltdrive or if the required drive poweris too large

you may also have a combinationof belt and end drive on the samemachine



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Measuring instrumentation Safety equipment Correction unit

You can choose between threemeasuring units depending on your

requirements:CAB 700 the compact basic devicefor all standard balancing tasks:Simple operation via the menu, cleardisplays and a high degree of accuracyenable even less experienced opera-tors to balance a rotor perfectly.CAB 800 the comfortable andversatile measuring unit withWindows NT operating system. Itoffers all the functions of CAB 700plus a vector readout, algorithms forcomplex unbalance corrections, aswell as various types of result display,recording and documentation.CAB 690 perfectly suited for thebalancing of either rigid workpiecesor flexible rotors. Balancing atoperating speed, recording of therotor behavior during acceleration,measurement of vibration velocity,measurement of concentricity andeccentricity at a very high level of

signal processing are some of itsmany outstanding features.


Schenck offers a complete line ofsafety enclosures that meet or

exceed industry regulations for theprotection of operator and machine.User-friendly protective devicesconforming to EC regulations ensurethat the machine is entitled to aCE/ISO 7475 certification.


The modular components of themass correction system (MAK)

enable directly unbalance correctionon the balancing machine by meansof the removal or addition of material.The units can be attached axially fora correction on the face, and radiallyfor a correction at the outer diameter.For angular drilling, the correctionunit can be tilted.



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MECHANICAL

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Mechanical equipment Experience and innovation

A precision balancing system is the

combination of mechanical equip-ment, measuring and control systemand software.With Schencks HM-series balancingmachines you can measure rotorunbalances equivalent to less thanone micrometer (m) eccentricity ofthe center of gravity. In other words, ifyou attached a label of the size of astamp to a 400 lb. rotor on a radius ofapproximately 8 inches, the balancingmachine would be able to identify the

position and the mass of this label this corresponds to a 3 millionth partof the rotor mass!

The stable bearing pedestalsare the interface betweenyour rotor and the balancingmachine. For this reason,they are appropriatelydesigned for good balancingquality and for everydayuse. Overall stiffness, maxi-mum linearity and minimumdamping characterize thismechanical unit.For the HM bearingpedestals we apply the

Schenck force-measuringprinciple. This means thatthe center part of thebearing pedestal is designedas a robust dynamometer.The pickups are situatedoutside the force flow andare not affected by impacts a definite advantage in arough industrial environ-ment.Another even more impor-

tant aspect is the perma-nent calibration of theentire system. Even in thefirst measuring run, theamount of unbalance andits angular position aredetermined for both balanc-ing planes and time con-suming calibration runs arenot necessary. The steelbearing pedestals even

The bearing pedestals sturdy and preciseabsorb heavy impacts thatmay occur when loading arotor without any problemsand without losing theirmeasuring accuracy. Themeasuring system alsomasters large initial unbal-ances.A small but quite importantdetail is the very narrowdesign of the bearingpedestals in direction of therotor axis. This provides

optimum conditions foreasy loading even in case ofshort rotor journals andexcessive cantilever lengthwithout requiring expensivespecial designs.Thus, the bearing pedestalsof our HM-series machinesare the basis for precisionbalancing at low operatingand service costs.


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The rotor support versatile and safe

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Inclined roller bearings safely support rotorsequipped with their ownanti-friction bearing. Thisheight adjustable bearingholds the rotor to bebalanced free from restor-ing forces about the rotorstransverse axis. Thus,

geometric inaccuracies ofthe anti-friction bearingscannot affect the unbalancereadout.

Sleeve bearings make balancing large,heavy rotors with journals,which are not suitable forroller carriages, possible.To avoid alignment errors,the bearings are sphericallyadjustable.

Special designsSpecial customized designsare also available for otherapplications such as forpedestal bearings or forcomplete assemblies.

Roller carriages are the solution forsupporting a large rangeof different rotors. Theycan be easily adjusted tothe journal diameter ofyour rotor without anytools. Their smooth surfaceavoids edge pressure and

excessive stress on rotorjournals. A sturdy radialhold-down bearing, eitherwith sliding block or withroller, increases operationalsafety. For specific applica-tions, such as flexiblerotors, we can also supplypatented damped rollercarriages.


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DRIVE The drives dynamic and flexible

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Belt drives are the right choice forrotors with a smoothsurface. They can be usedquickly, immediately and

without any special prepa-rations. The drives con-struction ensures accuratebelt guidance. In thespecified diameter range,the belt can be adjusted insuch a way that the beltruns vertically from therotor. This is the only wayto guarantee that the tensileforce of the belt does notaffect the measuringresult. Another advantage

The construction of the rotor also

determines the choice of the drive.You are particularly flexible withregard to any balancing tasks if youchoose a combined belt-and-end-drivefor your machine. With such a solutionyou will always have the appropriatedrive, even with frequently changingrotor programs. With the belt driveyou could balance an electric motorarmature, and then change to the enddrive to balance a fan which needsstrong drive power because of its

high air resistance all on one machineand with only a short set-up time.

The different drive systems

of this type of belt guidanceis that only two differentbelt lengths are required toutilize the entire performance

range of the machine.Stepped motor belt pulleysmake it possible to adjustthe drive power and speedto the body to be balanced.A fastening device securelyfixes the workpiece at thecircumference in balancingposition (optional).


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Squirrel-cage motors areused for small and mediumdrive power requirements,and DC motors are available

for larger controllablepower requirements. Freespeed selection, shortacceleration and shortbraking times enable aquick and dependable wayof working. Smooth accel-eration and brakingprocesses treat the univer-sal joint shafts, belts andother drive elements withcare. This also leads tohigh operational safety andreliable availability of thebalancing machine.

The performance adjusted to the taskEnd drives

are used for balancingvery heavy rotors with alarge moment of inertia, alarge air resistance, or for

rotors with a configurationthat makes using a beltdrive impossible.Gearboxes with motorizedpushbutton gear selectionprovide optimum adjust-ment of the electrical driveto the speed and torquerequirements. The flange ofthe universal drive shaft isaxially movable so that therotor can easily be connect-ed without having to moveit in the supports. A holdingdevice fixes the rotor atthe circumference in orderto ensure safe correction(optional).

There are two belt drivesavailable:The underslung belt drive ,proven and universal with

a large range of adjustment,is well suited for a rangeof diameters and transmitshigh drive power. The stan-dard pneumatic tensioningdevice provides for aconstant belt tension andfor reproducible measuringconditions.

The overslung belt drive is the appropriate solutionif high productivity isrequired. With this drive,the rotor loading andunloading procedure isvery quick and extremelysimple.


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MEASURING

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Once you have workedwith the powerful softwarein this precision measuringinstrument, you will findit is easily operated andperfect for universal appli-cations. With its compactdesign it meets the require-ments that really count

with universal balancingmachines. The CAB 700 isoperated by using a

combination of cursorkeys, a numerical keyboardand pre-defined functionkeys. It needs only very fewsteps to reach your aim.The well-arranged displaygives clear text informationin a variety of languages.Words, numbers, measuring

units and clear symbols indifferent colors facilitatea quick and safe readout.The instrument digitallyprocesses measuringsignals over a large unbal-ance range with highresolution and efficientnoise suppression.

The measuring devices simple and precise

The aim is a perfectly balanced

rotor and to reach this target weoffer an appropriate measuringdevice for every balancingrequirement. All devices functionaccording to a uniform operatingphilosophy provide precisionmeasurement processing and havea clear, easy-to-read display. Allof our measuring devices accuratelyprocess the measured signals andimmediately indicate the amountand angular position of the

unbalance. Functions such asstoring of measured values, index-ing displays, or instructions forcorrection, support the operatorquickly and efficiently whilebalancing the workpiece.

CAB 700 universal and cost-efficient


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The CAB 800 works withthe Windows NT operatingsystem. It offers all thefunctions of our CAB 700and provides a vectordisplay of the unbalancemeasurement at a glance.Thanks to its extendedcapacity, the CAB 800 can

also support complicatedbalancing processes.

Furthermore, it can easilybe coupled with other pro-gram systems or supersetcomputers.

Our CAB 690 is a high-performance measuringinstrument that has beenproven for both rigid andflexible rotors. It offers abroad application rangeand extraordinary accuracywith regard to signal pro-cessing and measurement.

It is the ideal instrumentfor balancing at operatingspeed and recordingmeasured values in orderto assess the rotor behaviorduring acceleration. It is

also perfectly suited formeasuring the vibrationvelocity, deviations inshape and eccentricityvalues. In addition, thismeasuring system issupplemented by powerfuland comprehensivecorrection software.

CAB 800 high-performance unit easy to integrate CAB 690 most accurate and versatile


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SAFETY

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Safety enclosures Its better to be on the safe side

Safety devices for balancing machines

help to avoid accidents and are evenprescribed by law for many applications.Schenck offers a complete line ofsafety barriers and enclosures thatmeet all regulations and applicablestandards for all machine sizes.

One decisive factor for thechoice of the appropriate

safety device is the hazardcaused by the rotor beingbalanced. This hazardpotential is determined bythe balancing speed, thebalancing method, and theshape and quality of theparts that may fly off therotor. Usually class B or Csafety enclosures are usedwith HM-series machines.

Protection class B is applic-able if parts flying off therotor are not a concern, butcontact with the rotor is(such as with fans, bladedrotors or metal-cuttingtools). This class requiresprotection around the rotor

or a barrier around theentire machine. The latter

offers optimum accessibilityfor loading and unloading,as well as during rotorcorrection and provides foreasy adjustment to anylocal conditions. Largesliding doors in the protec-tive enclosure ensure betteraccess to the balancingmachine. The enclosure isdesigned with safety inter-locks so it cannot beopened when the drive isactive and there is no riskof injury.

First-class safety


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All safety devices for HM-series machines meet the

requirements of DIN 45 690or ISO 7475. Balancingmachines equipped thisway are in line with theapplicable safety regula-tions of the EC (EuropeanStandard).

But that is not all protec-tion in accordance with theprotection classes B or C isonly one part of our safetyconcept. Comprehensivehazard analyses round offthe safety equipment ofSchenck RoTecs balancingmachines and make themperfect. an ergonomic design

avoids improper opera-tion

pinching points areeliminated

drives are equippedwith safety circuits at thebearing pedestals

radial hold-down bearingsavoid breaking out, and

axial hold-down bracketsensure that the rotorsdont move

AdviceAdvice in the field of protec-tive equipment is anotherelement of our safetyconcept. You can feel saferelying on our many yearsof experience and ourknowledge in this field!

Protection class C isapplicable if the possibility

of parts flying off the rotoris a concern. The protectivedevice is designed to bepuncture-proof so that theoperator and surroundingsare protected. When thedrive is active, the protectivedevice is electro-magnet-ically locked and cannot beopened accidentally. Allprotective enclosures areergonomically designed sothe rotors can be accessedquickly, without impedingthe operator.

Safety as a conceptNote! If your balancingapplication changes,

remember to check thatthe enclosure will meetthe new requirements!


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CORRECTING

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MAK Save time and cost

Measurement and correction without

re-clampingMAK Mass correction systemmakes it possible to measure andmake corrections in the balancingmachine. It is not necessary to movethe workpiece from the balancingmachine where the unbalance ismeasured to a separate machine toolfor correcting the unbalance as is stillcommon practice. Due to its design,MAK offers many advantages incomparison with the conventional

method. Since the rotor remains inthe machine during correction, timeis saved and balancing quality isimproved.Depending on the previously appliedbalancing method, number, and typeof rotor, the required time and costcan be reduced by 30 % to 50% !


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The rotor is loaded in themachine only once, thenthe measuring run isstarted and is immediately

followed by the correction.After checking the residualunbalance, the rotorbalancing is complete.Complicated handling ofthe rotors for correction isno longer necessary. SoMAK saves time exactlyat the point where youhave to invest most of it during the correctionprocess. Your rotor istransported less, so it istreated more carefully,and less material is re-moved which can provideadditional time and costsavings.

Load the rotor and thats it!In addition to the time sav-ings, there are also strongtechnical arguments infavor of the MAK system.

A correction in a separatemachine often leads toinaccuracies which thenrequires an additional cor-rection run. With MAK, therotor is indexed in thecorrect angular position inthe correction unit and thedrilling is performed exactlyat the required depth. As aresult, the ratio betweeninitial and residual unbal-ance improves. So addi-tional correction steps areavoided and the rotor is notruined by unnecessarydrillings.

Accurate correctionSuitable modules makeit possible to integrate theMAK system into yourbalancing machine at

nearly any point. With thissystem, correction can becarried out axially, radially,or on an angle. Variousmethods of metal cutting(removal of material) or ofattaching correction weights(addition of material) arepossible. MAK can be usedfor most types of rotors.Due to its modular design,it can be extended later orbuilt into existing balanc-ing machines.

Modular integration


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ERGONOMICS Ergonomics Operator and Machine

All frequently used adjust-ing elements are operatedby means of clampinglevers and no tiresome

search for the appropriatetool is required. To ensurequick and precise adjust-ments, the roller carriagesand idlers are equippedwith scales. For all basicsettings that must bechanged only occasionallywill you need one tool.

The bearing pedestals areadjusted at the desiredbearing distance by meansof a manual travelling

mechanism with ratchet. Atravelling mechanism withelectric motor and spring-loaded clamping devicesare available as an option.With these means, the HMbalancing machine can beset up for another rotorquickly and easily.

Re-setting in the blink ofan eye

Whats the use of good ideas if they

fail because of the details. We havethoroughly analyzed the balancingprocess and eliminated the problem-atic areas!


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A damping element at thehold-down bearings effec-tively prevents them fromclosing accidentally. Thisreduces the hazard of

injury and avoids excessiveuse of the interlockingmechanism. In case oflarge hold-down bearings,gas pressure springs are anadditional means to facil-itate operation so heavyhold-down bearings can beopened and closed withlittle effort and no dangerof injury.

Safety hold-down bearingsErgonomics also mean thatthe bearing pedestals havethe correct operatingheight. The rotor is easilyaccessible for correction

and all operating elementscan be reached withoutdifficulty. Working at theHM balancing machine isconvenient since it isdesigned to meet all opera-tor requirements.The same applies to thesafety devices which neitherimpede accessibility to theworking area, nor theloading and unloading oflarge rotors. And to makethings complete, operationof the protective devicescan be automated in orderto achieve faster handling.

Ergonomic in heightStraight to the objectivewithout any complications,that is our philosophy foroperating our measuringdevices. Clear operator

instructions, a limitednumber of function keys,intelligible dialogues andeasy-to-read displays inyour own language willguide you to balance arotor perfectly, without anyproblems.The operation of allmachine instrumentationis easy to learn in a shortperiod of time and helpsto avoid operator faults.Even if you do not use thebalancing machine veryoften, balancing will not bedifficult for you. The wellarranged display indicatingonly the informationactually required caneasily be read even froma greater distance.

Additional optionalaccessories, such as asecond operators monitor,or motorized bearingpedestals, considerably

expand the applicationrange of the balancingmachine and make opera-tion even easier.

Easy operation


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Type Machine Data Rotor Data

Max. rotorweight on roller

carriages [lb] 1)

Max. rotor diameter over themachine bed [in]

Standard Optional

Journal diameter rangeon roller carriages [in]

Max. sensitivityper plane

[gin] 2)

HM 1HM 10

HM 2HM 20

HM 3

HM 30

HM 4HM 40

HM 5HM 50

HM 6HM 60

HM 7

HM 70

HM 8HM 80

2236

100250

650

1500

3,3006,500

12,00017,500

27,50040,000

70,000

100,000

275,000550,000

1414

3131

49

49

6363

6363

8282

110

110

140140

4949

7676

8282

118118

140

140

196196

0.0020.004

0.0200.030

0.040

0.060

0.1000.150

0.3000.400

0.6000.800

1.250

1.500

3.0005.000

0.20 2.000.24 2.75

0.31 4.000.35 5.50

0.35 5.50

0.40 6.30

0.50 8.000.60 9.50

0.70 11.001.00 15.00

1.60 12.502.00 15.75

2.30 20.00

2.75 24.00

Different machine bed lengths are available,

depending on the type; this makes optimum

adaptation to the required maximum distance

between bearings possible.

Drive system standards are established on

each machine to accommodate typical

application requirements; however, drives

with higher hp ratings are also available.

1) For symmetrical loads.

Weight capacity is also deter-

mined by the available drive

power and balancing speed.

If machine is to be used

mainly in upper speed range,

choice of the next larger

machine model is recom-

mended to prevent excessive

wear. Maximum capacity on

rollers is also limited by

journal hardness (important

above 10,000 pound rotor

weight.)

2) This value is approximate

and depends on balancing

speed and type of measuring

unit. The minimum achiev-

able residual unbalance

depends on rotor, drive unit

and measuring instrument.

TECHNICAL DATAHM Specifications and Information


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Fax: 631-242-4147Please copy and send to Schenck Trebel

It is our aim to find an optimal solution for your balancing task. To prepare a quotation,please provide us with some information on your typical rotor types:

Name:

Phone:

Company:

Rotor type(s):

Rotor weight range [Ibs]:

Maximum diameter [inches]:

Maximum rotor length [inches]:

Journal diameter range [inches]:

Operating speed:

Balancing speed:

Balancing tolerance:

Number of correction planes:

Correction method:

Pieces per hour:

Sketch of rotor:

from

from

to

to

Address:

QUESTIONNAIRE From the rotor to the solution


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All advantages at a glance

Schencks HM-seriesbalancing machines aredesigned to meet mostbalancing requirementsin single unit or seriesproduction.

HM-series horizontal,hard-bearing balancingmachines solve any bal-ancing task.

Thanks to the modulardesign, the machines canbe fitted to each individ-ual application:

as a universal machine

that can be used ina repair shop withfrequently changingrotor sizes

runs. have a measuring

sequence with digitalmeasured value process-ing which makes themextremely accurate andstable in the long run,

enable perfect balancingof a large spectrum ofrotors with variable rotorsupport and adaptabledrive,

can be configuredindividually and adjustedto any balancing processby most versatile acces-

sories such as MAK mass correction withoutthe need to remove therotor from the machine,


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Balancing andDiagnostic Systems

Schenck Trebel Corporation535 Acorn StreetDeer Park, NY 11729Phone (631) 242-4010Fax (631) 242-4147eMail: [email protected]://www.schenck-usa.com

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The Group

Schenck RoTec Corporation2890 John R. RoadTroy, MI 48083Phone (248) 689-9000Fax (248) 689-8578eMail: [email protected]

RM 1016 US-e HM Series Modular Balancing Machines

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