NEXEN PINION SELECTION
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Roller Pinions
RPS ROLLER PINION Once you have selected your rack/gear, finding the right pinion is easy. The following pages offer step-by-step selection instructions as well as pinion specifications and details on accessories.
Pinion Selection Process .......................... 22 Specifications .............................................. 22 Dimensional Drawings ........................ 23–26 Pinion Accessories PATENTED
Adapters ............................................ 27
Preloaders .................................. 27–29
RPS Pinion Selection Process STEP 1: Determine your rack/gear size and find the same RPS pinion size. Always use the same size rack/gear and pinion. STEP 2: Select the material best suited for your application. (Other materials available upon request.) Hard Chrome: alloy steel with a thin, dense chrome coating Nickel: alloy steel with nickel plating Stainless: stainless steel with or without a hard chrome coating
STEP 3: Select Mounting Style: For easy installation and maximum versatility, Nexen recommends using the flange-
mounted version when practical.
Shaft Mount • Shaft Coupling or Shaft & Keyway mounting option • Coupling option uses a keyless mechanical compression coupling to secure to shaft • Available in multiple bore diameters. Contact Nexen.
PREMIUM PINIONS VALUE PINIONS
Pinion Selection
Pinion Type
RPS Number of Size Rollers
Distance per Revolution mm
Pitch Circle Max Diameter RPM * mm
Flange Mount • Conforms to ISO 9409 specifications • Nexen adapter preloader options available with this version
Product Number
Base Material/ Coating
Mount Style
966480 966490 966819 966650 966761 966687 966759 966820 966660 966771 966675 Request 966670 966758 966673 Request 966821 966822 966680 Request 966677 Request 966823 966690 Request 966697 Request 966824 966693
Hard Chrome Hard Chrome Nickel Nickel Stainless Nickel Stainless Nickel Nickel Stainless Nickel Stainless Nickel Stainless Nickel Stainless Nickel Nickel Nickel Stainless Nickel Stainless Nickel Nickel Stainless Nickel Stainless Nickel Nickel
Shaft Coupling Shaft Coupling Shaft Coupling Shaft Coupling Shaft Coupling Flange Flange Shaft Coupling Shaft Coupling Shaft Coupling Flange Flange Shaft Coupling Shaft Coupling Flange Flange Shaft Coupling Shaft Coupling Shaft Coupling Shaft Coupling Flange Flange Shaft Coupling Shaft Coupling Shaft Coupling Flange Flange Shaft Coupling Shaft Coupling
Bore Size mm
kg
Moment of Inertia kgm2x10-4
12 16 16 20 20 N/A N/A 22 25 25 N/A N/A 30 30 N/A N/A 32 40 45 45 N/A N/A 55 60 60 N/A N/A 55 60
0.2 0.3 0.7 0.7 0.7 0.8 0.8 1.4 1.3 1.3 1.2 1.2 2.1 2.1 2.1 2.1 7.3 6.8 6.4 6.4 6.6 6.6 12.9 12.4 12.4 15.5 15.5 21.4 20.9
0.4 1.0 3.9 3.9 3.9 4.0 4.0 10.6 10.5 10.5 10.2 10.2 25.5 25.2 25.2 25.2 173.0 171.0 169.0 169.0 168.0 168.0 598.0 594.0 594.0 665.0 665.0 1184.0 1180.0
Mass
10 12
10 10
100 120
31.8 38.2
2400 4000
16
10
160
50.9
1500
20
10
200
63.7
1500
25
10
250
79.6
1820
32
12
384
122.2
1719
40
12
480
152.8
750
4014
14
560
178.3
643
Request 966700 Request
Stainless Nickel Stainless
Shaft Coupling Flange Flange
60 N/A N/A
20.9 23.5 23.5
1180.0 1306.0 1306.0
16
10
160
50.9
750
966826
Aluminum
Shaft & Keyway
16
0.4
2.4
20
10
200
63.7
600
966827
Aluminum
Shaft & Keyway
16
0.7
6.0
25
10
250
79.6
480
966828
Aluminum
Shaft & Keyway
22
1.1
14.7
* The maximum rated speed of a RPS system is equal to the lowest rating of either the pinion or the rack. See the Definitions section for more information on these attributes.
22
Common Attributes for All Pinions Estimated Life
See System Life section.
Operating Temperature Range
°C
-5 to 40
Lubrication/Tooth Grease
Part Number 853901
Pinion Dimensions Additional Dimensions The Pinion dimensions listed here are for selection purposes only. For detailed drawings and CAD models, please visit www.nexengroup.com.
RPS10 Premium Pinion
RPS12 Premium Pinion
Shaft Mounted Pinion 36.5
Shaft Mounted Pinion 39.5
29.0 Minimum Shaft Insertion
10.5 2x
11.5 2x
See Table
28.0 41.0 2x
See Table
34.0 49.0 2x
58.0 17.0
5.7 Reference B Surface
31.0 Minimum Shaft Insertion
64.5
15.5
11.7
5.7 Reference B Surface
23
12.7
Pinion Dimensions
Pinion Adapters Pinion adapters allow the pinion to mount to one frame-size larger of a reducer. Moving up a reducer size is sometimes needed due to reducer availability or motor sizing reasons. All Nexen pinion adapters are made from corrosion resistant materials or coatings. For your convenience, we have included pinion adapter dimensions next to each ISO9409 flange mounted pinion. See Table 6 for pinion adapter part numbers.
Pinion Dimensions RPS16 Premium Pinion Shaft Mounted Pinion
ISO 9409 Flange Mount Pinion Pinion
~52.5 38.5 27.5
Minimum Shaft Insertion 12.0 (2x)
Adapter
Required For Some Gearhead Sizes Pilot 45° Length Typ 3.5 7.00 Pilot Length Screw 3.5 22.5° Length 6.5 (M4)
38.5
(8) M4 x 0.7 Screws (Shown) included for ISO Adapter 12.0 (966688)* 2x
See Table ø42.0
82.0
ø67.0 2X
14.5
Pinion Dimensions
Reference Surface
13.5
Pilot ø11.995
13.5
Reference Surface
-B-
ø12.0 Thru
ø48.0
Pilot ø19.995
ø20.00 ø9.0 Thru
11.5
ø67.0 2X
82.0
11.5
-B-
14.5
ø31.50
M5-0.8 7 Screws Supplied
5.2 Screw Length
*(4) M3 x 0.5 x 45 mm screws (Not Shown) included for use with APEX AD047
RPS16 Value Pinion Note: See product drawing for keyway specifications.
42.0
12.9 2x
28.0 Minimum Shaft Insertion
ø67 2x
81.5
See Table 11.5
15.2
Shaft & Keyway Pinion
Reference Surface -B-
14.5
RPS20 Premium Pinion Shaft Mounted Pinion 42.5
~58.5 32.0
Minimum Shaft Insertion 12.0 (2x)
ISO 9409 Flange Mount Pinion Pinion M5-08 at 45° Nexen Supplied1 ø31.50
See Table
ø84.0 2x
3.5 Pilot Length 7.0 Screw Length
42.5 12.0 2x
106.0 106.0
13.5
Reference Surface
-B-
ø20.0 Thru
ø65.0
ø50.0 ø16.0 Thru
15.5
10.0 45° Typ
ø84.0 2x
ø50.0 22.0
Adapter
Required For Some Gearhead Sizes
Pilot ø19.995
0.5 Bolt Head Protrusion 15.5 Reference Surface
22.0 13.5 -B-
24
Pilot ø31.495
M6-1.00 7 Screws Supplied
9.5 Screw Length
(8 Screws for Adapter Mount)(7 Screws for Direct Mount)
1
Pilot Length 5.5
Pinion Dimensions RPS20 Value Pinion Note: See product drawing for keyway specifications.
46.0
13.5 2x
28.0 Minimum Shaft Insertion
ø 84 2x
106.0
See Table
15.1
15.9
22.0
Reference Surface -B-
Shaft & Keyway Pinion
Shaft Mounted Pinion
ISO 9409 Flange Mount Pinion Pinion
67.5 49.5 37.5
Minimum Shaft Insertion 14.0 (2x)
See Table
ø101.0 2x
49.5
M6-1.00 6 Custom Screws @ 45° Supplied
8.9 Screw Length
14.0 2x
22.5°
ø23.5 Thru ø101.0 2x
126.0
ø63.0
16.0
18.5 Reference Surface
-B-
Pilot ø31.500
24.5
-B-
45°
15.5 2x
53.0
36.0 Minimum Shaft Insertion
ø101 2x
125.5
See Table 17.3
Shaft & Keyway Pinion
Reference Surface -B-
25
5.5 Pilot Length
M6-1.00 11 Screws Supplied
RPS25 Value Pinion Note: See product drawing for keyway specifications.
ø100.0
22.5°
° 22.5 Pilot Length ø31.5 5.5 Thru 16.0 ø63.0
18.5 Reference Surface
22.5° 22.5°
7.6
ø50.0
22.5°
45°
126.0 24.5
Adapter
Required For Some Gearhead Sizes Pilot 9.8 ø39.995 Screw Length 45° 45° 11.00
18.5
24.5
Pinion Dimensions
RPS25 Premium Pinion
Pinion Dimensions RPS32 Premium Pinion Shaft Mounted Pinion 88.5 68.5 51.0
ISO 9409 Flange Mount Pinion Pinion
Minimum Shaft Insertion 20.0 (2x)
45°
See Table
22.5° 4x
68.5
Screw ø80.0 18.75° Length 10.0 8.3 22.5° Pilot ø49.995 45°
20.0 ø32.0 2x Thru
176.0
ø148.0 2x
Adapter
Required For Some Gearhead Sizes
176.0
ø148.0 2X
ø98.0
45° 28.0
Pinion Dimensions
24.5 Reference -BSurface
28.0
ø63.0 M6-1.0 10 Screws Supplied
22.0
Pilot Length 5.5
Pilot ø39.995
5.5 Pilot Length 22.0
24.5 Reference Surface
-B-
M8-1.25 8 Screws Supplied
ø40.00 Thru
11.8 Screw Length
RPS40 Premium Pinion Shaft Mounted Pinion 96.5 88.0 30.0 2x
ISO 9409 Flange Mount Pinion Pinion
Minimum Shaft Insertion
15°
See Table
224.0
ø190.0 2x
31.5
32.5
18.0
30° Typ
10.0Screw Length
7.5 Pilot Length
15°
ø50.0 Thru
ø160.0
ø190.0 2X Pilot ø79.995
34.0
ø125.0
5.5 Pilot Length
ø80.0
M8-1.25 11 Screws (Supplied)
-B-
30.0 2x
224.0
Pilot ø49.995
34.0
Reference Surface
96.5
30° Typ
ø40.0 Thru
Adapter
Required For Some Gearhead Sizes
31.5 Reference Surface
M10 1.5 11 Screws at 30° Supplied
32.5
-B-
14.8 Screw Length
RPS4014 Premium Pinion Shaft Mounted Pinion 116.0 82.0
Minimum Shaft Insertion 35.0 2x
12.5° ø125.0 ø60.0 Thru
30° Typ
Adapter
116.0 35.0 11.6
30 Typ °
° 30 p Ty
See Table
ISO 9409 Flange Mount Pinion Pinion
247.0
Pilot ø79.995
37.0 Reference Surface
42.0 -B-
M10-1.50 6 For ISO-9409 12 For Adapter 12 Screws Supplied
48°
Pilot Length 11.5 24° 3X ø89.995 Pilot
214.0 2x
120°
ø105.0
17.4 Screw Length 45°
247.0
ø214.0 2x 33.0
Required For Some Gearhead Sizes
27° 33.0
Reference Surface
ø80.0 Thru
48°
42.0
26
ø180.0
-B-
37.0
Pilot Length 7.5
24° M16-2.0 8 Screws Supplied
ø140.0 22.0
22.8 Screw Length
Pinion Preloader Pair Nexen’s Flange-Mount Pinion with our RPS Pinion Preloader for easy integration into your machine design. Preloaders feature an adjuster that allows the pinion to be moved up or down into the rack while keeping the pinion properly oriented to the rack. The pilot in the adjuster plate accommodates common servo gearhead sizes from your favorite servo gearhead manufacturer.
FEATURES: • High-Precision Ground Surfaces
• Allows Perpendicular Movement • Corrosion Resistant Materials
Preloader and Adapter components are either made from corrosion-resistant stainless steel, nickel, or zinc plating. Preloader
ISO 9409 Roller Pinion
Pinion Adapter & Preloader
Gearhead with ISO 9409 Output
Customer Machine Frame
ISO 9409 Adapter (If Required)
SELECTING PINION ADAPTERS AND PRELOADERS If directly mounting the pinion to the reducer: Disregard the Adapter column and select the preloader and gearhead for your RPS Pinion size.
Table 6
If going up a reducer frame size: Start in the Adapter column and select the compatible pinion, adapter, preloader and gearhead.
Gearhead Compatibility Table Adapter w/ Pinion
Pinion Size
(not required in some applications)
Pinion Preloader
RPS16
N/A
RPS20
Customer Provided Gearhead Alpha/ Wittenstein
APEX
Mijno
Neugart
SEW-Euro
Sumitomo
Stöber
N/A
N/A
AD047
N/A
N/A
N/A
N/A
N/A
RPS16 & 966688
960851
TP004
AD064
BDB 085
PLFE/N 64
PSBF221/2
N/A
PH/A/KX 321/2
RPS25
RPS20 & 966676
960850
TP010
AD090
BDB 120
PLFE/N 90
PSBF321/2
PNFX080
PH/A/KX 421/2
RPS32
RPS25 & 966674
960852
TP025
AD110
BDB 145
PLFE/N 110
PSBF521/2
PNFX250
PH/A/KX 521/2
RPS40
RPS32 & 966668
960853
TP050
AD140
BDB 180
PLFN 40
PSBF621/2
PNFX450
PH/A/KX 721/2
RPS4014
RPS40 & 966698
960854
TP110
AD200
BDB 250
PLFN 200
PSBF721/2
N/A
PH/A/KX 821/2
N/A
RPS4014 & 966701
N/A
TP300
AD255
BDB 300
N/A
N/A
N/A
PH/A/KX 912/23
This is a partial list. Other gearheads may apply.
27
Preloader Dimensions RPS-PRE-ISO-064-3 Product Number 960851 Preloader Details 35.0
M4 - 0.7 X 16.0 2 Screws Supplied
Customer-Supplied Mounting Surface See View to Right 8.50 2x
Hex 3.0 mm Wrench 8.0
.03
4.25
R8.0 4x
Customer Mounting Surface Details M4-0.70, 9.0 mm 2 Holes Located as Shown
25.0
10.0 Max
12.5
1.6
Min - Max ø107.05 114.7 -124.3
36.0 2x
67.46
ø79.0
105.0 ø88.0
47.5
ø64.0
36.0 2x
40.0 M4-0.7 x 10.0 8 Screws Supplied
45° Typ
50.0
Pinion Preloader
100.0
M6 - 1.00 (4X) Shoulder Cap Screw (Supplied w/ Washers)
Gearhead & Pinion Shown for Reference (Not Included)
80.0
Mounting Surface
M6-1.00 THRU ø8.013, 4.00 Deep 4 Holes Located as Shown
RPS-PRE-ISO-090-3 Product Number 960850 Preloader Details 50.0 M6 - 1.0 X 20.0 2 Screws Supplied
Customer-Supplied Mounting Surface See View to Right
Hex 8 mm Wrench [5/16] 12.7
ø142.86
12.0 2x 6.00 .03 1.6
Min - Max 149.7 - 159.4
ø109.0
Customer Mounting Surface Details M6-1.0, 8.0 Deep 2 Holes Located As Shown
30.0
17.0 Max
15.0 87.15 48.5 (2x)
135.0
M5 - 0.8 X 16.0 8 Screws Supplied
ø110.0
48.5 (2x)
61.0
ø90.0
52.5 62.5
R8.0 4x
M8 - 1.25 (4X) Shoulder Cap Screw Supplied w/ Washers
125.0
Gearhead & Pinion Shown for Reference (Not Included)
105.0
Mounting Surface
M8-1.25 THRU ø10.013, 4.00 Deep 4 Holes Located as Shown
RPS-PRE-ISO-110-3 Product Number 960852 Preloader Details Hex 8 mm Wrench M5 - 0.8 X 16.0 16 Screws Supplied
50.0
M6 - 1.0 X 20.0 2 Screws Supplied 12.7
12.0 2x
Customer-Supplied Mounting Surface See View to Right
6.0
Min - Max 194.1 -204.0
ø135.0
Customer Mounting Surface Details M6-1.0, 8.0 Deep 2 Holes Located As Shown M8-1.25 THRU 16.0 ø10.013, 4.00 Deep Max 6 Holes Located as Shown 30.0 .03 ø152.0 15.0 1.6
180.0
102.65 76.5 48.5
71.5
ø110.0
48.5
71.5
90.0
R8.0 4x
80.0 160.0
22.5° Typ
M8 - 1.25 (6X) Shoulder Cap Screw Supplied w/ Washers
Gearhead & Pinion Shown for Reference (Not Included)
28
Mounting Surface
28.0 31.0 109.0
70.0 140.0
Preloader Dimensions RPS-PRE-ISO-140-3 Product Number 960853 Preloader Details 50.0 Hex 8 mm Wrench 12.7
M6 - 1.0 X 20.0 2 Screws Supplied M6 - 1.0 X 20.0 24 Screws Supplied
12.0 2x 6.0
Customer Mounting Surface Details M6-1.0, 10.0 Deep 2 Holes Located As Shown Max M8-1.25 THRU 30.0 22.0 ø10.013, 4.00 Deep 8 Holes Located as Shown .03 15.0 1.6 125.65 99.0 67.5 2x 2x
Min - Max 239.6 - 249.5
ø168.0
225.0
ø140.0 R12.0 4x
Customer-Supplied Mounting Surface See View to Right
67.5 2x 99.0 2x
112.5 15° Typ
92.5
M8 - 1.25 (8X) Shoulder Cap Screw Supplied With Washers
185.0
Gearhead & Pinion Shown for Reference (Not Included)
Mounting Surface
42.5
82.5 122.5 165.0
ø193.0
Preloader Details Hex 8 mm Wrench
50.0
M10 - 1.5 Shoulder Cap Screws 8 Supplied w/ Washers
M6 - 1.0 X 20.0 2 Screws Supplied 12.7
ø233.0
14.0 7.0
Customer-Supplied Mounting Surface See View to Right
Min - Max 140.0 294.1 - 304.0
R12.0 4x
125.0 250.0
15° Typ
M8 - 1.25 X 20.0 24 Screws Supplied
M6-1.0, 10.0 Deep M10-1.50 THRU 2 Holes Located As Shown ø12.013, 4.13 Deep 8 Holes Located as Shown 34.0 Max 30.0 .03 15.0 1.6 152.65
280.0
ø200.0
Customer Mounting Surface Details
ø225.0
Gearhead & Pinion Shown for Reference (Not Included)
29
Mounting Surface
43.0 108.0 173.0 216.0
87.5 2x
123.5 2x
87.5 2x
123.5 2x
Pinion Preloader
RPS-PRE-ISO-200-3 Product Number 960854
Appendix: Definitions & Notes ARCSECOND
ArcSecond is a unit of angular measurement equal to 1/3600 of a degree.
BACKLASH
The innovative design of the RPS tooth allows for a zero-backlash drive system. Because zero backlash is impossible to measure, industry standard maintains that anything under 3.2 microns is considered zero.
CORROSION RESISTANCE
Nexen makes no corrosion resistance claims for specific applications but does offer various corrosion countermeasures that include stainless steel and various surface treatments or coatings. Nexen will convey all material and coating specifications, but it is up to the customer to determine application suitability based on this information and/or thorough sample testing.
EFFICIENCY
The RPS system uses needle bearings to support the rollers that engage the teeth. This eliminates the sliding friction found in many other motion control systems and gives it an efficiency greater than 99%. This high efficiency means little is lost to friction, heat, and wear, providing a long life of 60,000,000 pinion revolutions (up to 36 million meters of travel).
LIFE RATING Pinions: Pinion life is based on L10 of the bearing components. Just like any bearing, environmental conditions will affect life. The product rating is assuming a clean environment with normal manufacturing facility temperatures. Pinion performance tends to be constant over its life with a rapid deterioration at the end of life as the needle bearings supporting the rollers fail. Racks & Gears: The rack and gears have their own specific life ratings depending on model, and in some cases RPS size, and is based on tooth contacts at allowed loads and speeds. The combined pinion and rack or gear that makes up a given RPS or RPG system will have the combined life of the lower-rated component and will be greatly effected by machine design, RPS or RPG installation, operating patterns, and receiving recommended lubrication intervals while operated in a clean, dry, 20° C environment. Rack wear is relatively linear over its life. Application and environmental conditions and lubrication intervals will impact expected product life. Depending on the length of the rack or diameter of the gear and usage patterns, it is often possible to replace the pinion several times, restoring full system performance before the rack or gear would need replacement if the pinion is replaced before reaching the point where its failure starts damaging rack or gear teeth.
LUBRICATION FREE OPERATION
In some cases the RPS rack can be operated without lubrication on the rack teeth or pinion rollers. This is dependent on the specific rack model and the maximum speed being less than 30 m/min. The no-lubrication option generally applies to rack that has received a surface treatment and does not apply to bare steel models of rack or any gearing. See specifications for the specific rack model you are considering to know if this is possible.
Appendix
Operating without tooth/roller lubrication will reduce tooth life but can be beneficial in food, pharmaceutical, clean room, and other applications where the grease could contaminate the environment, or applications with high levels environmental contaminates that would be attracted to the grease and accelerate the wear rate. Nexen can not calculate a life rating when running without lubrication due to the number of variables that impact life, but based on past experience, the reduction has been modest and far exceeds other mechanical drive alternatives.
Appendix: Definitions & Notes MASS VS. WEIGHT
Mass is the quantity of matter contained in an object, while weight is the force by which the object is pulled to the earth due to gravity. Therefore, in this literature, mass is shown in kilograms (kg) and weight is shown in kilograms force (kgf).
NOISE RATING
The RPS system is nearly silent at low speeds and typically less than 75 dB at full speed. This is dependent on machine design, proper RPS installation, whether lubrication is used or not, and is difficult to isolate from other drive train and guiding system noise, so your results may vary.
OPERATING TEMPERATURE RANGE
This is the range that the RPS system will function in. Accuracy specifications are based on 20° C and thermal expansion/contraction will effect the accuracy of the RPS system. It is recommended the RPS system be installed at the highest temperature the system will be operated at and avoid wide temperature swings for maximum accuracy and performance. For applications outside of this temperature range, or with wide temperature swings, contact Nexen for more information.
POSITIONAL ACCURACY
This is dependent on proper machine design and RPS product installation. Positional accuracy is measured at 20° C and subject to variations due to mounting surface irregularities, rigidity, installation accuracy, proper maintenance, and ambient temperature. To be conservative, the RPS rack transmitting accuracy has been rounded up to the next ±10 μm. Other rack positional accuracy specifications have been rounded up to the next ±5 μm. For RPG gearsets, the angular accuracy rating is increased (less accurate) by 5% and then rounded to the next whole number, except in the case of very large gears where rounding may be fractional. This allows customers to achieve Nexen accuracy ratings with reasonable effort. Higher performance can be obtained if machine design and tolerances are optimized.
SERIES DIFFERENTIATION
The RPS and RPG pinions, racks and gears have been made in different series (thicknesses) depending on the specific product and should not be mixed when matching a pinion to a given rack or gear. All current pinions, racks and gears are B-series. Series A pinions (discontinued) are interchangeable with C-series pinions (discontinued) and have a wider body with longer rollers than the B-series pinions. The current rack and gear products only use B-series pinions, and the previous gears could use either depending on the RPG size. B-series pinions will not physically fit on a C-series gear, and a C-series pinion would be compromised if used on a B-series rack or gear due to a higher bending moment on the rollers, which would reduce their lives.
SHOCK FACTOR
Shock Factor is a value given to represent the smoothness of operation. Accommodating for Shock Factor when calculating system requirements ensures more accurate product selection.
Appendix
CUTTING SYSTEMS GANTRY SYSTEMS MEDICAL PRODUCTS ROBOTICS
INDUSTRIES & APPLICATIONS
AEROSPACE MACHINE TOOL SEMICONDUCTOR
MATERIAL HANDLING
www.nexengroup.com In accordance with Nexen’s established policy of constant product improvement, the specifications contained in this document are subject to change without notice. Technical data listed in this document are based on the latest information available at the time of printing and are also subject to change without notice. For current information, please consult www.nexengroup.com or contact Nexen’s Technical Support Group at the location to the right.
Nexen Group, Inc. 560 Oak Grove Parkway Vadnais Heights, MN 55127
(800) 843-7445 Fax: (651) 286-1099 www.nexengroup.com
Nexen has sales offices throughout the United States, Europe, Japan, and Australia. ISO 9001 Certified
©2014 Nexen Group, Inc.
68
FORM NO. L-21282-E-1014
Roller Pinions
RPS ROLLER PINION Once you have selected your rack/gear, finding the right pinion is easy. The following pages offer step-by-step selection instructions as well as pinion specifications and details on accessories.
Pinion Selection Process .......................... 22 Specifications .............................................. 22 Dimensional Drawings ........................ 23–26 Pinion Accessories PATENTED
Adapters ............................................ 27
Preloaders .................................. 27–29
RPS Pinion Selection Process STEP 1: Determine your rack/gear size and find the same RPS pinion size. Always use the same size rack/gear and pinion. STEP 2: Select the material best suited for your application. (Other materials available upon request.) Hard Chrome: alloy steel with a thin, dense chrome coating Nickel: alloy steel with nickel plating Stainless: stainless steel with or without a hard chrome coating
STEP 3: Select Mounting Style: For easy installation and maximum versatility, Nexen recommends using the flange-
mounted version when practical.
Shaft Mount • Shaft Coupling or Shaft & Keyway mounting option • Coupling option uses a keyless mechanical compression coupling to secure to shaft • Available in multiple bore diameters. Contact Nexen.
PREMIUM PINIONS VALUE PINIONS
Pinion Selection
Pinion Type
RPS Number of Size Rollers
Distance per Revolution mm
Pitch Circle Max Diameter RPM * mm
Flange Mount • Conforms to ISO 9409 specifications • Nexen adapter preloader options available with this version
Product Number
Base Material/ Coating
Mount Style
966480 966490 966819 966650 966761 966687 966759 966820 966660 966771 966675 Request 966670 966758 966673 Request 966821 966822 966680 Request 966677 Request 966823 966690 Request 966697 Request 966824 966693
Hard Chrome Hard Chrome Nickel Nickel Stainless Nickel Stainless Nickel Nickel Stainless Nickel Stainless Nickel Stainless Nickel Stainless Nickel Nickel Nickel Stainless Nickel Stainless Nickel Nickel Stainless Nickel Stainless Nickel Nickel
Shaft Coupling Shaft Coupling Shaft Coupling Shaft Coupling Shaft Coupling Flange Flange Shaft Coupling Shaft Coupling Shaft Coupling Flange Flange Shaft Coupling Shaft Coupling Flange Flange Shaft Coupling Shaft Coupling Shaft Coupling Shaft Coupling Flange Flange Shaft Coupling Shaft Coupling Shaft Coupling Flange Flange Shaft Coupling Shaft Coupling
Bore Size mm
kg
Moment of Inertia kgm2x10-4
12 16 16 20 20 N/A N/A 22 25 25 N/A N/A 30 30 N/A N/A 32 40 45 45 N/A N/A 55 60 60 N/A N/A 55 60
0.2 0.3 0.7 0.7 0.7 0.8 0.8 1.4 1.3 1.3 1.2 1.2 2.1 2.1 2.1 2.1 7.3 6.8 6.4 6.4 6.6 6.6 12.9 12.4 12.4 15.5 15.5 21.4 20.9
0.4 1.0 3.9 3.9 3.9 4.0 4.0 10.6 10.5 10.5 10.2 10.2 25.5 25.2 25.2 25.2 173.0 171.0 169.0 169.0 168.0 168.0 598.0 594.0 594.0 665.0 665.0 1184.0 1180.0
Mass
10 12
10 10
100 120
31.8 38.2
2400 4000
16
10
160
50.9
1500
20
10
200
63.7
1500
25
10
250
79.6
1820
32
12
384
122.2
1719
40
12
480
152.8
750
4014
14
560
178.3
643
Request 966700 Request
Stainless Nickel Stainless
Shaft Coupling Flange Flange
60 N/A N/A
20.9 23.5 23.5
1180.0 1306.0 1306.0
16
10
160
50.9
750
966826
Aluminum
Shaft & Keyway
16
0.4
2.4
20
10
200
63.7
600
966827
Aluminum
Shaft & Keyway
16
0.7
6.0
25
10
250
79.6
480
966828
Aluminum
Shaft & Keyway
22
1.1
14.7
* The maximum rated speed of a RPS system is equal to the lowest rating of either the pinion or the rack. See the Definitions section for more information on these attributes.
22
Common Attributes for All Pinions Estimated Life
See System Life section.
Operating Temperature Range
°C
-5 to 40
Lubrication/Tooth Grease
Part Number 853901
Pinion Dimensions Additional Dimensions The Pinion dimensions listed here are for selection purposes only. For detailed drawings and CAD models, please visit www.nexengroup.com.
RPS10 Premium Pinion
RPS12 Premium Pinion
Shaft Mounted Pinion 36.5
Shaft Mounted Pinion 39.5
29.0 Minimum Shaft Insertion
10.5 2x
11.5 2x
See Table
28.0 41.0 2x
See Table
34.0 49.0 2x
58.0 17.0
5.7 Reference B Surface
31.0 Minimum Shaft Insertion
64.5
15.5
11.7
5.7 Reference B Surface
23
12.7
Pinion Dimensions
Pinion Adapters Pinion adapters allow the pinion to mount to one frame-size larger of a reducer. Moving up a reducer size is sometimes needed due to reducer availability or motor sizing reasons. All Nexen pinion adapters are made from corrosion resistant materials or coatings. For your convenience, we have included pinion adapter dimensions next to each ISO9409 flange mounted pinion. See Table 6 for pinion adapter part numbers.
Pinion Dimensions RPS16 Premium Pinion Shaft Mounted Pinion
ISO 9409 Flange Mount Pinion Pinion
~52.5 38.5 27.5
Minimum Shaft Insertion 12.0 (2x)
Adapter
Required For Some Gearhead Sizes Pilot 45° Length Typ 3.5 7.00 Pilot Length Screw 3.5 22.5° Length 6.5 (M4)
38.5
(8) M4 x 0.7 Screws (Shown) included for ISO Adapter 12.0 (966688)* 2x
See Table ø42.0
82.0
ø67.0 2X
14.5
Pinion Dimensions
Reference Surface
13.5
Pilot ø11.995
13.5
Reference Surface
-B-
ø12.0 Thru
ø48.0
Pilot ø19.995
ø20.00 ø9.0 Thru
11.5
ø67.0 2X
82.0
11.5
-B-
14.5
ø31.50
M5-0.8 7 Screws Supplied
5.2 Screw Length
*(4) M3 x 0.5 x 45 mm screws (Not Shown) included for use with APEX AD047
RPS16 Value Pinion Note: See product drawing for keyway specifications.
42.0
12.9 2x
28.0 Minimum Shaft Insertion
ø67 2x
81.5
See Table 11.5
15.2
Shaft & Keyway Pinion
Reference Surface -B-
14.5
RPS20 Premium Pinion Shaft Mounted Pinion 42.5
~58.5 32.0
Minimum Shaft Insertion 12.0 (2x)
ISO 9409 Flange Mount Pinion Pinion M5-08 at 45° Nexen Supplied1 ø31.50
See Table
ø84.0 2x
3.5 Pilot Length 7.0 Screw Length
42.5 12.0 2x
106.0 106.0
13.5
Reference Surface
-B-
ø20.0 Thru
ø65.0
ø50.0 ø16.0 Thru
15.5
10.0 45° Typ
ø84.0 2x
ø50.0 22.0
Adapter
Required For Some Gearhead Sizes
Pilot ø19.995
0.5 Bolt Head Protrusion 15.5 Reference Surface
22.0 13.5 -B-
24
Pilot ø31.495
M6-1.00 7 Screws Supplied
9.5 Screw Length
(8 Screws for Adapter Mount)(7 Screws for Direct Mount)
1
Pilot Length 5.5
Pinion Dimensions RPS20 Value Pinion Note: See product drawing for keyway specifications.
46.0
13.5 2x
28.0 Minimum Shaft Insertion
ø 84 2x
106.0
See Table
15.1
15.9
22.0
Reference Surface -B-
Shaft & Keyway Pinion
Shaft Mounted Pinion
ISO 9409 Flange Mount Pinion Pinion
67.5 49.5 37.5
Minimum Shaft Insertion 14.0 (2x)
See Table
ø101.0 2x
49.5
M6-1.00 6 Custom Screws @ 45° Supplied
8.9 Screw Length
14.0 2x
22.5°
ø23.5 Thru ø101.0 2x
126.0
ø63.0
16.0
18.5 Reference Surface
-B-
Pilot ø31.500
24.5
-B-
45°
15.5 2x
53.0
36.0 Minimum Shaft Insertion
ø101 2x
125.5
See Table 17.3
Shaft & Keyway Pinion
Reference Surface -B-
25
5.5 Pilot Length
M6-1.00 11 Screws Supplied
RPS25 Value Pinion Note: See product drawing for keyway specifications.
ø100.0
22.5°
° 22.5 Pilot Length ø31.5 5.5 Thru 16.0 ø63.0
18.5 Reference Surface
22.5° 22.5°
7.6
ø50.0
22.5°
45°
126.0 24.5
Adapter
Required For Some Gearhead Sizes Pilot 9.8 ø39.995 Screw Length 45° 45° 11.00
18.5
24.5
Pinion Dimensions
RPS25 Premium Pinion
Pinion Dimensions RPS32 Premium Pinion Shaft Mounted Pinion 88.5 68.5 51.0
ISO 9409 Flange Mount Pinion Pinion
Minimum Shaft Insertion 20.0 (2x)
45°
See Table
22.5° 4x
68.5
Screw ø80.0 18.75° Length 10.0 8.3 22.5° Pilot ø49.995 45°
20.0 ø32.0 2x Thru
176.0
ø148.0 2x
Adapter
Required For Some Gearhead Sizes
176.0
ø148.0 2X
ø98.0
45° 28.0
Pinion Dimensions
24.5 Reference -BSurface
28.0
ø63.0 M6-1.0 10 Screws Supplied
22.0
Pilot Length 5.5
Pilot ø39.995
5.5 Pilot Length 22.0
24.5 Reference Surface
-B-
M8-1.25 8 Screws Supplied
ø40.00 Thru
11.8 Screw Length
RPS40 Premium Pinion Shaft Mounted Pinion 96.5 88.0 30.0 2x
ISO 9409 Flange Mount Pinion Pinion
Minimum Shaft Insertion
15°
See Table
224.0
ø190.0 2x
31.5
32.5
18.0
30° Typ
10.0Screw Length
7.5 Pilot Length
15°
ø50.0 Thru
ø160.0
ø190.0 2X Pilot ø79.995
34.0
ø125.0
5.5 Pilot Length
ø80.0
M8-1.25 11 Screws (Supplied)
-B-
30.0 2x
224.0
Pilot ø49.995
34.0
Reference Surface
96.5
30° Typ
ø40.0 Thru
Adapter
Required For Some Gearhead Sizes
31.5 Reference Surface
M10 1.5 11 Screws at 30° Supplied
32.5
-B-
14.8 Screw Length
RPS4014 Premium Pinion Shaft Mounted Pinion 116.0 82.0
Minimum Shaft Insertion 35.0 2x
12.5° ø125.0 ø60.0 Thru
30° Typ
Adapter
116.0 35.0 11.6
30 Typ °
° 30 p Ty
See Table
ISO 9409 Flange Mount Pinion Pinion
247.0
Pilot ø79.995
37.0 Reference Surface
42.0 -B-
M10-1.50 6 For ISO-9409 12 For Adapter 12 Screws Supplied
48°
Pilot Length 11.5 24° 3X ø89.995 Pilot
214.0 2x
120°
ø105.0
17.4 Screw Length 45°
247.0
ø214.0 2x 33.0
Required For Some Gearhead Sizes
27° 33.0
Reference Surface
ø80.0 Thru
48°
42.0
26
ø180.0
-B-
37.0
Pilot Length 7.5
24° M16-2.0 8 Screws Supplied
ø140.0 22.0
22.8 Screw Length
Pinion Preloader Pair Nexen’s Flange-Mount Pinion with our RPS Pinion Preloader for easy integration into your machine design. Preloaders feature an adjuster that allows the pinion to be moved up or down into the rack while keeping the pinion properly oriented to the rack. The pilot in the adjuster plate accommodates common servo gearhead sizes from your favorite servo gearhead manufacturer.
FEATURES: • High-Precision Ground Surfaces
• Allows Perpendicular Movement • Corrosion Resistant Materials
Preloader and Adapter components are either made from corrosion-resistant stainless steel, nickel, or zinc plating. Preloader
ISO 9409 Roller Pinion
Pinion Adapter & Preloader
Gearhead with ISO 9409 Output
Customer Machine Frame
ISO 9409 Adapter (If Required)
SELECTING PINION ADAPTERS AND PRELOADERS If directly mounting the pinion to the reducer: Disregard the Adapter column and select the preloader and gearhead for your RPS Pinion size.
Table 6
If going up a reducer frame size: Start in the Adapter column and select the compatible pinion, adapter, preloader and gearhead.
Gearhead Compatibility Table Adapter w/ Pinion
Pinion Size
(not required in some applications)
Pinion Preloader
RPS16
N/A
RPS20
Customer Provided Gearhead Alpha/ Wittenstein
APEX
Mijno
Neugart
SEW-Euro
Sumitomo
Stöber
N/A
N/A
AD047
N/A
N/A
N/A
N/A
N/A
RPS16 & 966688
960851
TP004
AD064
BDB 085
PLFE/N 64
PSBF221/2
N/A
PH/A/KX 321/2
RPS25
RPS20 & 966676
960850
TP010
AD090
BDB 120
PLFE/N 90
PSBF321/2
PNFX080
PH/A/KX 421/2
RPS32
RPS25 & 966674
960852
TP025
AD110
BDB 145
PLFE/N 110
PSBF521/2
PNFX250
PH/A/KX 521/2
RPS40
RPS32 & 966668
960853
TP050
AD140
BDB 180
PLFN 40
PSBF621/2
PNFX450
PH/A/KX 721/2
RPS4014
RPS40 & 966698
960854
TP110
AD200
BDB 250
PLFN 200
PSBF721/2
N/A
PH/A/KX 821/2
N/A
RPS4014 & 966701
N/A
TP300
AD255
BDB 300
N/A
N/A
N/A
PH/A/KX 912/23
This is a partial list. Other gearheads may apply.
27
Preloader Dimensions RPS-PRE-ISO-064-3 Product Number 960851 Preloader Details 35.0
M4 - 0.7 X 16.0 2 Screws Supplied
Customer-Supplied Mounting Surface See View to Right 8.50 2x
Hex 3.0 mm Wrench 8.0
.03
4.25
R8.0 4x
Customer Mounting Surface Details M4-0.70, 9.0 mm 2 Holes Located as Shown
25.0
10.0 Max
12.5
1.6
Min - Max ø107.05 114.7 -124.3
36.0 2x
67.46
ø79.0
105.0 ø88.0
47.5
ø64.0
36.0 2x
40.0 M4-0.7 x 10.0 8 Screws Supplied
45° Typ
50.0
Pinion Preloader
100.0
M6 - 1.00 (4X) Shoulder Cap Screw (Supplied w/ Washers)
Gearhead & Pinion Shown for Reference (Not Included)
80.0
Mounting Surface
M6-1.00 THRU ø8.013, 4.00 Deep 4 Holes Located as Shown
RPS-PRE-ISO-090-3 Product Number 960850 Preloader Details 50.0 M6 - 1.0 X 20.0 2 Screws Supplied
Customer-Supplied Mounting Surface See View to Right
Hex 8 mm Wrench [5/16] 12.7
ø142.86
12.0 2x 6.00 .03 1.6
Min - Max 149.7 - 159.4
ø109.0
Customer Mounting Surface Details M6-1.0, 8.0 Deep 2 Holes Located As Shown
30.0
17.0 Max
15.0 87.15 48.5 (2x)
135.0
M5 - 0.8 X 16.0 8 Screws Supplied
ø110.0
48.5 (2x)
61.0
ø90.0
52.5 62.5
R8.0 4x
M8 - 1.25 (4X) Shoulder Cap Screw Supplied w/ Washers
125.0
Gearhead & Pinion Shown for Reference (Not Included)
105.0
Mounting Surface
M8-1.25 THRU ø10.013, 4.00 Deep 4 Holes Located as Shown
RPS-PRE-ISO-110-3 Product Number 960852 Preloader Details Hex 8 mm Wrench M5 - 0.8 X 16.0 16 Screws Supplied
50.0
M6 - 1.0 X 20.0 2 Screws Supplied 12.7
12.0 2x
Customer-Supplied Mounting Surface See View to Right
6.0
Min - Max 194.1 -204.0
ø135.0
Customer Mounting Surface Details M6-1.0, 8.0 Deep 2 Holes Located As Shown M8-1.25 THRU 16.0 ø10.013, 4.00 Deep Max 6 Holes Located as Shown 30.0 .03 ø152.0 15.0 1.6
180.0
102.65 76.5 48.5
71.5
ø110.0
48.5
71.5
90.0
R8.0 4x
80.0 160.0
22.5° Typ
M8 - 1.25 (6X) Shoulder Cap Screw Supplied w/ Washers
Gearhead & Pinion Shown for Reference (Not Included)
28
Mounting Surface
28.0 31.0 109.0
70.0 140.0
Preloader Dimensions RPS-PRE-ISO-140-3 Product Number 960853 Preloader Details 50.0 Hex 8 mm Wrench 12.7
M6 - 1.0 X 20.0 2 Screws Supplied M6 - 1.0 X 20.0 24 Screws Supplied
12.0 2x 6.0
Customer Mounting Surface Details M6-1.0, 10.0 Deep 2 Holes Located As Shown Max M8-1.25 THRU 30.0 22.0 ø10.013, 4.00 Deep 8 Holes Located as Shown .03 15.0 1.6 125.65 99.0 67.5 2x 2x
Min - Max 239.6 - 249.5
ø168.0
225.0
ø140.0 R12.0 4x
Customer-Supplied Mounting Surface See View to Right
67.5 2x 99.0 2x
112.5 15° Typ
92.5
M8 - 1.25 (8X) Shoulder Cap Screw Supplied With Washers
185.0
Gearhead & Pinion Shown for Reference (Not Included)
Mounting Surface
42.5
82.5 122.5 165.0
ø193.0
Preloader Details Hex 8 mm Wrench
50.0
M10 - 1.5 Shoulder Cap Screws 8 Supplied w/ Washers
M6 - 1.0 X 20.0 2 Screws Supplied 12.7
ø233.0
14.0 7.0
Customer-Supplied Mounting Surface See View to Right
Min - Max 140.0 294.1 - 304.0
R12.0 4x
125.0 250.0
15° Typ
M8 - 1.25 X 20.0 24 Screws Supplied
M6-1.0, 10.0 Deep M10-1.50 THRU 2 Holes Located As Shown ø12.013, 4.13 Deep 8 Holes Located as Shown 34.0 Max 30.0 .03 15.0 1.6 152.65
280.0
ø200.0
Customer Mounting Surface Details
ø225.0
Gearhead & Pinion Shown for Reference (Not Included)
29
Mounting Surface
43.0 108.0 173.0 216.0
87.5 2x
123.5 2x
87.5 2x
123.5 2x
Pinion Preloader
RPS-PRE-ISO-200-3 Product Number 960854
Appendix: Definitions & Notes ARCSECOND
ArcSecond is a unit of angular measurement equal to 1/3600 of a degree.
BACKLASH
The innovative design of the RPS tooth allows for a zero-backlash drive system. Because zero backlash is impossible to measure, industry standard maintains that anything under 3.2 microns is considered zero.
CORROSION RESISTANCE
Nexen makes no corrosion resistance claims for specific applications but does offer various corrosion countermeasures that include stainless steel and various surface treatments or coatings. Nexen will convey all material and coating specifications, but it is up to the customer to determine application suitability based on this information and/or thorough sample testing.
EFFICIENCY
The RPS system uses needle bearings to support the rollers that engage the teeth. This eliminates the sliding friction found in many other motion control systems and gives it an efficiency greater than 99%. This high efficiency means little is lost to friction, heat, and wear, providing a long life of 60,000,000 pinion revolutions (up to 36 million meters of travel).
LIFE RATING Pinions: Pinion life is based on L10 of the bearing components. Just like any bearing, environmental conditions will affect life. The product rating is assuming a clean environment with normal manufacturing facility temperatures. Pinion performance tends to be constant over its life with a rapid deterioration at the end of life as the needle bearings supporting the rollers fail. Racks & Gears: The rack and gears have their own specific life ratings depending on model, and in some cases RPS size, and is based on tooth contacts at allowed loads and speeds. The combined pinion and rack or gear that makes up a given RPS or RPG system will have the combined life of the lower-rated component and will be greatly effected by machine design, RPS or RPG installation, operating patterns, and receiving recommended lubrication intervals while operated in a clean, dry, 20° C environment. Rack wear is relatively linear over its life. Application and environmental conditions and lubrication intervals will impact expected product life. Depending on the length of the rack or diameter of the gear and usage patterns, it is often possible to replace the pinion several times, restoring full system performance before the rack or gear would need replacement if the pinion is replaced before reaching the point where its failure starts damaging rack or gear teeth.
LUBRICATION FREE OPERATION
In some cases the RPS rack can be operated without lubrication on the rack teeth or pinion rollers. This is dependent on the specific rack model and the maximum speed being less than 30 m/min. The no-lubrication option generally applies to rack that has received a surface treatment and does not apply to bare steel models of rack or any gearing. See specifications for the specific rack model you are considering to know if this is possible.
Appendix
Operating without tooth/roller lubrication will reduce tooth life but can be beneficial in food, pharmaceutical, clean room, and other applications where the grease could contaminate the environment, or applications with high levels environmental contaminates that would be attracted to the grease and accelerate the wear rate. Nexen can not calculate a life rating when running without lubrication due to the number of variables that impact life, but based on past experience, the reduction has been modest and far exceeds other mechanical drive alternatives.
Appendix: Definitions & Notes MASS VS. WEIGHT
Mass is the quantity of matter contained in an object, while weight is the force by which the object is pulled to the earth due to gravity. Therefore, in this literature, mass is shown in kilograms (kg) and weight is shown in kilograms force (kgf).
NOISE RATING
The RPS system is nearly silent at low speeds and typically less than 75 dB at full speed. This is dependent on machine design, proper RPS installation, whether lubrication is used or not, and is difficult to isolate from other drive train and guiding system noise, so your results may vary.
OPERATING TEMPERATURE RANGE
This is the range that the RPS system will function in. Accuracy specifications are based on 20° C and thermal expansion/contraction will effect the accuracy of the RPS system. It is recommended the RPS system be installed at the highest temperature the system will be operated at and avoid wide temperature swings for maximum accuracy and performance. For applications outside of this temperature range, or with wide temperature swings, contact Nexen for more information.
POSITIONAL ACCURACY
This is dependent on proper machine design and RPS product installation. Positional accuracy is measured at 20° C and subject to variations due to mounting surface irregularities, rigidity, installation accuracy, proper maintenance, and ambient temperature. To be conservative, the RPS rack transmitting accuracy has been rounded up to the next ±10 μm. Other rack positional accuracy specifications have been rounded up to the next ±5 μm. For RPG gearsets, the angular accuracy rating is increased (less accurate) by 5% and then rounded to the next whole number, except in the case of very large gears where rounding may be fractional. This allows customers to achieve Nexen accuracy ratings with reasonable effort. Higher performance can be obtained if machine design and tolerances are optimized.
SERIES DIFFERENTIATION
The RPS and RPG pinions, racks and gears have been made in different series (thicknesses) depending on the specific product and should not be mixed when matching a pinion to a given rack or gear. All current pinions, racks and gears are B-series. Series A pinions (discontinued) are interchangeable with C-series pinions (discontinued) and have a wider body with longer rollers than the B-series pinions. The current rack and gear products only use B-series pinions, and the previous gears could use either depending on the RPG size. B-series pinions will not physically fit on a C-series gear, and a C-series pinion would be compromised if used on a B-series rack or gear due to a higher bending moment on the rollers, which would reduce their lives.
SHOCK FACTOR
Shock Factor is a value given to represent the smoothness of operation. Accommodating for Shock Factor when calculating system requirements ensures more accurate product selection.
Appendix
CUTTING SYSTEMS GANTRY SYSTEMS MEDICAL PRODUCTS ROBOTICS
INDUSTRIES & APPLICATIONS
AEROSPACE MACHINE TOOL SEMICONDUCTOR
MATERIAL HANDLING
www.nexengroup.com In accordance with Nexen’s established policy of constant product improvement, the specifications contained in this document are subject to change without notice. Technical data listed in this document are based on the latest information available at the time of printing and are also subject to change without notice. For current information, please consult www.nexengroup.com or contact Nexen’s Technical Support Group at the location to the right.
Nexen Group, Inc. 560 Oak Grove Parkway Vadnais Heights, MN 55127
(800) 843-7445 Fax: (651) 286-1099 www.nexengroup.com
Nexen has sales offices throughout the United States, Europe, Japan, and Australia. ISO 9001 Certified
©2014 Nexen Group, Inc.
68
FORM NO. L-21282-E-1014
