Guide Wheels and Track Technical Guide HepcoMotion.com

DUALVEE ® GUIDE WHEELS (OVERVIEW) WHEEL TYPE Original Guide Wheels Carbon PART NUMBER SCHEME APPLICATION CONDITIONS W_ • General purpose • Factory floor conditions W_X Original Guide Wheels Stainless Studded Polymer Wheels Vacuum Wheels • Corrosive conditions APPLICATION EXAMPLES • Automation • Automotive • Woodworking • Printing • Packaging • Paper/textiles BALL RETAINER MATERIAL • Medical • Laboratory • Food & beverage Polymer (overmold) 440C Stainless • Corrosive conditions • Low noise requirements • Electronics • Medical • Laboratory • Vacuum environments • Material science Washdown Wheels...

SYSTEM CONFIGURATION AND GUIDE WHEEL MOUNTING Load Orientation and Eccentric Wheels In designing a wheel carriage, it is important to use the right combination and orientation of eccentric and concentric guide wheels. Linear guide systems should always have two concentric wheels and all the other guide wheels should be eccentric. The eccentric wheels are adjusted to remove the play between the wheels and track, equally loading all the wheels so that they roll instead of slide or skid on the track. When the wheel carriage is loaded in the radial direction, the pair of concentric wheels should...

LIFE AND WEAR RESISTANCE Harsh/Debris-Laden Environments and Wear Resistance Since the circumference of the wheel is greater at the major diameter than at the minor diameter, each rotation creates a variation of velocity on the surface of the wheel. This wheel surface velocity variation results in a constant sweeping action. As such, DualVee® guide wheels are successfully employed in a wide variety of harsh environments, including in the presence of metal chips, powders, fibres, slurries, and other environments. The presence of harsh contaminants will reduce the service life of all types of linear...

LOAD CAPACITIES, LIFE ESTIMATE, AND SIZING/SELECTION Guide Wheel Load Capacity & Mass WHEEL VARIETY Polymer Overmold Carbon Steel, Stainless Steel, & Food/Pharma BLIND HOLE STUD (SWS…/ SWI...) THROUGH HOLE STUD (SWA...) WHEEL SIZE Solid Lubricant High Temp. & Low Temp. Eccentrically studded or bushed wheels provide adjustability of the wheel to the track. Because of their ability to move and adjust, eccentric wheels are not intended to be the primary carrier of external radial loads. See Wheel Carriage Configurations on page 5.

LOAD CAPACITIES, LIFE ESTIMATE, AND SIZING/SELECTION Sizing and Selection Steps The load/life estimation requires a basic understanding of the principles of statics, the ability to work with free body diagrams, and the capacity to resolve externally applied forces on a DualVee®, MadeWell®, and MinVee® based carriage assembly into the radial and axial reaction forces at each guide wheel in the design. The life of a DualVee®, MadeWell®, and MinVee® based carriage assembly will be limited to the life of the most heavily loaded wheel in the design. Step 1: Calculate the resultant radial and axial...

LOAD CAPACITIES, LIFE ESTIMATE, AND SIZING/SELECTION Example Loading Scenarios Scenario 1 F FA = Resultant axial force a = Distance from force to wheel x = Track vee apex spacing distance F FA = Resultant axial force a = Distance from track vee apex to force x = Track vee apex spacing distance F FA = Resultant axial force FR = Resultant radial force a = Distance from force to wheel F = Applied force x = Track vee apex spacing distance Example: Scenario 3 Using Scenario 3's loading configuration with two concentric wheels on the top track ( 1 ) and two eccentric wheels on the bottom track ( 2...

MOUNTING Mounting Dimensions and Formulas When fabricating a DualVee® linear guide from components the following formulas are applicable for mating wheel plate and track plate designs. For sizes 1 through 4XL DualVee® single-edge track with equivalent sized guide wheels: Inboard mounting (see Fig. 1): A = B + X Outboard mounting (see Fig. 2): A = C - X Exterior mounting (see Fig. 3): A = D - Y WHERE A = Distance between wheel plate hole centers B & C = Distance between track reference edges D = Distance between the theoretical sharp of 90° exterior angles DUALVEE® WHEEL SIZE X & Y = Size-specific...

MOUNTING Machining for Mounting Studded Guide Wheels Suggested machining for mounting studded wheels (SWS series and SWI polymer) is shown below: ECCENTRIC STUD HOLE GEOMETRY CONCENTRIC STUD HOLE GEOMETRY C’BORE DIAMETER REMAINING MATERIAL REAMED HOLE DIAMETER REAMED HOLE CHAMFER MINIMUM THICKNESS

MOUNTING Track Mounting As a matter of good engineering practice, the DualVee® components should not be used where their wear or failure could cause personal injury. Track Flatness, Straightness, and Parallelism In most DualVee® applications, accuracy plays a small role in the successful implementation of a guide wheel system. The flatness, straightness, and parallelism of the plate or bar to which the DualVee® track is attached (bolted) determine the accuracy of the system. Cold finished or extruded bar or plate is adequate for many applications. The DualVee® track incorporates a mounting shoulder...

PRELOADING AND ADJUSTMENT Benefits of Preloading Typically, in a guide wheel and carriage application, there should be two concentric mounted wheels and the rest of the wheels should be on eccentric mounts. The eccentric type guide wheels are used to create a cam action to preload the guide wheels against one side of the guide track. Normal adjustment is obtained by rotating the eccentric bushing, journal, or stud feature until all free play is removed from the carriage assembly. When the eccentrics are adjusted and the carriage plate is held firmly in place, one should be able to rotate by hand...

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