PRECISION MOTION CONTROL Application & Selection Guide Racks Gears ROLLER PINION TECHNOLOGY 39 APPENDIX Definitions & Notes 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. Rack Models Available As the name premium suggests, this is Nexen's top of the line model featuring market leading accuracy and a hard chrome coating for corrosion resistance. A perfect choice for any precision motion need. • Very High Precision/Accuracy...

RPS System Specifications Table 1 Rack Thrust Capacity (N) Premium Rack Standard Rack Universal & Universal Stainless Racks Endurance Rack Versa Rack VALUE PINION PREMIUM PINION Pinion Torque (Nm) Premium Pinion Value Pinion Peak Torque Max. Average Torque for Full Life Static Torque Peak Torque Accuracy & Repeatability RACK MODEL PINION TYPE Accuracy Repeatability Accuracy * Repeatability * Premium Pinion Value Pinion Static Torque Max. Average Torque for Full Life Premium Rack Standard Rack Endurance Rack Universal Rack & Universal Stainless Versa Rack Rack Model Attributes (not affected by...

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 Figure 1 Refer to this drawing when recording values for Force, Weight & Angle From Horizontal. Rack Selection 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. 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...

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.) Use the total Weight to be Driven as your Load Mass value. Load Acceleration: A = Vmax Load Acceleration A known acceleration from a servo drive provider is preferred if available....

Rack Specifications Table 5 Common Rack Specifications Rack Size Rack Specifications Rack Tooth Pitch Rack Height Rack Width Module All Metal Racks Versa Rack Rack Section Size Rack Length Number of Rack Teeth Rack Weight Versa Rack * The maximum rated speed of a RPS system is equal to the lowest rating of either the pinion or the rack.

Rack Dimensions All dimensions shown in mm. G F (Diameter & Number of Holes) D Rack Dimensions & Product Numbers Reference Surface D A (Half Rack/ Full Rack) Rack Length Hole Height Hole Spacing Rack Height Tooth Pitch Rack Thickness # Half Rack # Full Rack See drawings or CAD models on Nexen’s website for additional dimensions and tolerances. Rack Product Numbers Rack Length Half 480 mm Alignment Tool Contact Nexen Contact Nexen Half 480 mm Alignment Tool Contact Nexen Contact Nexen Half 512 mm Full 992 mm Alignment Tool Premium Standard Universal Universal Uncoated Stainless Coated Stainless...

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. Gear Selection...

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 Sample: tA = 0.66 seconds ÷ 2 = 0.33 seconds Rotation Angle Per Index Rotation Angle Per Index: q = 2p Max Angular Speed: Sample: 0.785 rad ÷ 0.66 seconds •...