PRECISION MOTION CONTROL Application & Selection Guide The most advanced technology in linear and rotary motion control.

A New Standard For Precision The Nexen Roller Pinion System (RPS) revolutionizes linear and rotary motion control possibilities. Giving a fresh face to traditional rack and pinion systems, the RPS overcomes the troublesome limitations of conventional drive systems and offers unmatched performance. Across industries as varied as laser cutting and mining, users will benefit from the accuracy and 99% efficiency of this new technology. The incredible performance of the RPS starts with a pinion consisting of bearing-supported rollers that engage a unique tooth profile. Two or more rollers engage the...

THE NEXEN ADVANTAGE Overcoming Common Problems Found in Traditional Drive Systems INDUSTRY PROBLEMS Linear Motors Ball Traditional Rack/Gear Belt Chain Direct Rotary Stages Screws & Pinion Systems Drives Drives Direct Drive Motors ROLLER PINION SYSTEMS Backlash / Vibrations High Cost High Maintenance Near-Zero Backlash Dirty Operation High Positional Accuracy Economical, Efficient Components High Load Capacity Quiet: pinion rollers glide smoothly along teeth High Speeds (up to 11 m/sec) Magnetic Field High Wear/ Low Life Limited System Length/Size Long Life (up to 36 million meters) Custom Rack...

RPS SYSTEM Nexen offers both premium and value roller pinions with rack options to fit any application. The following tables show specifications for the various rack and pinion configurations.

RPS System Configurations & Comparisons Nexen features six different rack models and two pinion types, ensuring the perfect solution for any application. First compare the rack attributes to determine which rack model best meets your needs. Then compare the specifications of both the premium and value pinions to select the ideal RPS system configuration.

RPS System Specifications Table 1 Rack Thrust Capacity (N) Specifications listed for the Value Pinion are "out-of-box" ratings. Over time, these specifications are affected by operating torque and speed. NOTE: Refer to the System Life section for Load Life Comparison. See the Definitions section at the end of this catalog for details on these attributes.

RPS RACKS Nexen offers modular & custom rack sizes for unlimited system length. Choose from six rack models for a perfect fit in any application.

Linear Rack Selection Process Nexen offers a large range of rack sizes and materials, so you can find the perfect components for your application. Take advantage of the following guide designed to make selecting the right components for your system simple. If you don’t find what you need, contact Nexen Group. STEP 1: GATHER APPLICATION DATA Before you begin calculations, there are nine key measurements that you will need from your application. Collect the data and record it in the chart below. With this data available you can proceed on to the calculations on the following page. /A This curve will...

STEP 2: CALCULATING RPS REQUIREMENTS Rack selection is based on the load capacity required by your application. Using the information gathered on the preceding page, perform the following calculations to determine the Total Force of the Load. Use the space provided to record your calculations. (The sample calculations assume a single pinion driving an axis. Use the Sample Data from the chart on the preceding page.) Load Mass Load Mass: M = W Use the total Weight to be Driven as your Load Mass value. Sample: M = 150.0 kgf = 150 kg Rack Selection Load Acceleration Load Acceleration: A = Vmax+ tA...

Rack Specifications Table 5 Common Rack Specifications * The maximum rated speed of a RPS system is equal to the lowest rating of either the pinion or the rack.

Rack Dimensions & Product Numbers See drawings or CAD models on Nexen's website for additional dimensions and tolerances.

RPG GEARS Nexen offers the RPG Gears as solid rings up to 1.7 m in diameter. Segmented rings or arcs can also be combined to create your own custom rotary drive system.

Rotary Gear Selection Process Nexen offers both gears and individual arc segments for unlimited possibilities in your machine design. Take advantage of the following guide designed to make selecting the right components for your system simple. If you don’t find what you need, contact Nexen Group about a custom design. STEP 1: GATHER APPLICATION DATA Before you begin calculations, there are key measurements that you will need from your application. Collect the data and record it in the chart below. With this data available you can proceed on to the calculations on the following page. SAMPLE APPLICATION...

STEP 2: CALCULATING RPG REQUIREMENTS FOR SIMPLE INDEXING APPLICATIONS Gear selection is based on the load capacity required by your application. Using the information gathered on the preceding page, perform the following calculations. If acceleration or deceleration times vary, or there are other changes in velocity, calculate the acceleration torque for each interval and use the highest value for RPG selection purposes. Acceleration Time Acceleration Time: tA = ti T 2 Sample: tA = 0.66 seconds * 2 = 0.33 seconds Rotation Angle Per Index: 0 = 2p T Ni Sample: 0 = 2p * 8 IPR = 0.785 rad Rotation...

Gear Specifications RPG Size Common Attributes for All Gears

Gear Dimensions & Product Numbers Basic gear dimensions shown for selection purposes only and subject to change. Go to www.nexengroup.com for detailed drawings and CAD models. If none of the products below meet your needs, contact Nexen and one can be designed to your specifications. Due to the variety of gears and gear segments, these products are made to order. Please contact Nexen for lead times.

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.

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 Flange Mount • Shaft Coupling...