RK 4 Model Rotor Kit
Datasheet

Bently Nevada Machinery Condition Monitoring141592 Rev. NDescription
The RK 4 Rotor Kit closely simulates actual rotating machine
behavior. Its unique geometry and its ability for users toisolate and control individual machine characteristics makeit useful as both a teaching aid and as a research anddevelopment tool.
Machine malfunctions and experiments that can bedemonstrated include, but are not limited to:lllRotor unbalance - both single plane and multiplane
Shaft rub condition
Oil whirl and oil whip instabilities

In addition to machinery behavior, the rotor kit can be used toteach the fundamentals of proximity probe placement,
gapping, and troubleshooting. It can also help technicianslearn how to read and interpret proximity probe signals using
an oscilloscope.

Performance and Features
The RK 4 Rotor Kit has a V-frame design that has beendeveloped to provide better control of the housing dynamic
stiffness properties. The mechanical tolerances have also
been tightened, resulting in more accurate machine behavior
modeling. The RK 4 Rotor Kit motor can closely hold thedesired speed with changes in loading conditions. This has
been accomplished by incorporating a direct current motor
and high performance control circuitry. The motor can run ineither a clockwise or counter-clockwise direction and has
adjustable slow roll speed capability. It can be controlled
remotely by using a ±5 volt control input, such as a signal
generator or dc power supply, to drive the motor speedRK 4 Model Rotor Kit
Datasheet

141592 Rev. N

control device. Rotor speed is displayed on adigital tachometer with a large LCD readout.
The RK 4 Rotor Kit consists of:lll

A mechanical base (including motor,coupling, rotor shaft, two balance wheels,
two journal bearings and bearing blocks,
six proximity probes, three probe mounts,
a rub screw, and three safety covers).
A Proximitor assembly that contains five
Proximitor units.
A direct current motor speed controldevice.

The motor speed control device provides power
for both the rotor kit and the Proximitor
assembly. A measurement and diagnostic tool,such as an oscilloscope or other diagnostic
instrument, should be ordered separately inorder to observe the RK 4 machine behavior.s
An optional Oil Whirl/Whip kit can be ordered.
The Oil whirl kit consists of:llll

A high pressure oil pump assembly.
An oil whirl bearing assembly.
A rotor kit shaft with oil bearing journal.
A load frame.

Fluid-induced instabilities (both oil whirl andwhip) as well as basic journal bearing behavior
can be demonstrated using the oil whirl/whipkit. The oil whirl bearing is made fromtransparent plastic, allowing the user to view
the oil film development during operation. The
load frame is used to remove the effect ofgravity on the rotor and to position the rotor to
any desired eccentricity ratio.
The kit includes:ll

A mechanical base (including motor,coupling, drive assembly, drive belts, andtwo proximity probes for motor speed
control and Keyphasor signal pickup).
A motor speed control unit.

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RK 4 Model Rotor Kit
Datasheet

141592 Rev. N

WeightSpecifications
Basic Rotor Kit
Power

95 to 125 Vac, single phase,or 190 to 250 Vac, singlephase,
50 to 60 Hz at 3.0 A maximum.

Fuse Rating

250 V at 3 A slow-blow.

Buffered
Proximitor
AssemblyOutputs

200 mV/mil.

Max Speed

10,000 rpm, typical.

Max Ramp
Rate±15,000 rpm/min. typical.

Rotor Kit
Base

14.5 kg (32 lb)

Proximitor
Assembly

0.9 kg (2 lb)

Motor
Speed
Control

2.7 kg (6 lb)

Oil Whirl/Whip Kit

Mechanical Base Dimensions

Oil Pump
Power

95 to 125 Vac, single phase
50 to 60 Hz at 1.5 A maximum; or
190 to 250, single phase,
50 to 60 Hz at 0.75 A maximum.
User-selectable input voltage.

Oil Pump
Fuse Rating

95 to 125 Vac
250 V 3.0 A slow-blow190 to 250 Vac
250 V 1.5 A slow-blow
User-selectable fuse

Height

165 mm (6.5 in)

Width

340 mm (13.4 in)

Oil Pump Dimensions

Depth

789 mm (30.8 in)

Height145 mm (5.7 in)Motor Speed Control Dimensions

Width

317 mm (12.5 in)

Height

115 mm (4.5 in)Depth

292 mm (11.5 in)

Width

260 mm (10.3 in)

Depth

325 mm (12.8 in)

Proximitor Assembly Dimensions
Height

86 mm (3.4 in)

Width

154 mm (6.1 in)

Depth

158 mm (6.2 in)

Shaft
diameter

10 mm (0.4 in)Environmental
OperatingTemperature

25° C ± 10° C (77° F ± 18° F)
95% RH Non-condensing
Recommended indoor use
only.

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RK 4 Model Rotor Kit
Datasheet

141592 Rev. N04312254(16), 168614(16) , and105M7925(4)

Ordering Information
For the detailed listing of country andproduct specific approvals, refer tothe Approvals Quick Reference_Guide(108M1756) available fromwww.Bently.com.

Cover Hinge Set

Spare Power Cords

Rotor Kit

02198937

USA 10A/250V 3-wire

285300Brazil 10A/250V 3-wire

Spare Probes

123456-AA
A: Oil Whirl/Whip Kit
00

Not required01

Required

137482Oil Whirl/Whip Kit

Safety Cover Replacement Parts (refer toFigure 1)
106M5920

Main Cover

106M5918

Small End Cover

106M5916

Speed Wheel Cover

106M5917

End Cap Cover(for use with fluid bearing only)

105M7924,
105M7930,
106M8448,
and
106M8449

Lock Mechanism

105M7923
and
105M7929

Polycarbonate Screw(need quantity of 3 each)

105M7931

Rubber Bumper(need quantity of 3)

33090300-02-1002-00

Spare 3300 NSv Probe, M8X1,
without armor(Speed Probe)

126379Manuals
RK 4 Rotor Kit

Spare 3300 NSv Probe, M8X1,
without armor(Vibration, Keyphasor probes)

Additional Oil Whirl/Whip Option

Accessories
12637633090300-03-1002-00

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Oil Whirl/Whip Kit

RK 4 Model Rotor Kit
Datasheet

141592 Rev. N

Graphs and Figures

Figure 1: Rotor Kit

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RK 4 Model Rotor Kit
Datasheet

141592 Rev. N

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imply any affiliation with or endorsement by the respective holders.
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for a particular purpose or use. Baker Hughes hereby disclaims any and all liability for any direct, indirect,consequential or special damages, claims for lost profits, or third party claims arising from the use of theinformation, whether a claim is asserted in contract, tort, or otherwise. Baker Hughes reserves the right to makechanges in specifications and features shown herein, or discontinue the product described at any time without
notice or obligation. Contact your Baker Hughes representative for the most current information.
The information contained in this document is the property of Baker Hughes and its affiliates; and is subject tochange without prior notice. It is being supplied as a service to our customers and may not be altered or its content
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1631 Bently Parkway South, Minden, Nevada USA 89423
Phone: 1.775.782.3611 (US) or Bently.com/support
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